Fair Value (Assets and Liabilities measured at fair value on a recurring basis) (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Millions, unless otherwise specified
|
|
|
Cash and cash equivalents |
$ 8,406 |
$ 9,429 |
Total assets at fair value |
28,323 |
27,975 |
Debt Securities [Member]
|
|
|
Available-for-sale Securities |
19,226 |
18,002 |
U.S. Government and Agency Obligations [Member]
|
|
|
Available-for-sale Securities |
2,538 |
2,373 |
State and Municipal Obligations [Member]
|
|
|
Available-for-sale Securities |
6,667 |
6,765 |
Corporate Obligations [Member]
|
|
|
Available-for-sale Securities |
7,209 |
6,007 |
U.S. Agency Mortgage-Backed Securities [Member]
|
|
|
Available-for-sale Securities |
2,238 |
2,353 |
Non-U.S. Agency Mortgage-Backed Securities [Member]
|
|
|
Available-for-sale Securities |
574 |
504 |
Equity Securities [Member]
|
|
|
Available-for-sale Securities |
677 |
544 |
Quoted Prices in Active Markets (Level 1) [Member]
|
|
|
Cash and cash equivalents |
7,615 |
8,569 |
Total assets at fair value |
9,830 |
10,469 |
Quoted Prices in Active Markets (Level 1) [Member] | Debt Securities [Member]
|
|
|
Available-for-sale Securities |
1,765 |
1,567 |
Quoted Prices in Active Markets (Level 1) [Member] | U.S. Government and Agency Obligations [Member]
|
|
|
Available-for-sale Securities |
1,752 |
1,551 |
Quoted Prices in Active Markets (Level 1) [Member] | State and Municipal Obligations [Member]
|
|
|
Available-for-sale Securities |
0 |
0 |
Quoted Prices in Active Markets (Level 1) [Member] | Corporate Obligations [Member]
|
|
|
Available-for-sale Securities |
13 |
16 |
Quoted Prices in Active Markets (Level 1) [Member] | U.S. Agency Mortgage-Backed Securities [Member]
|
|
|
Available-for-sale Securities |
0 |
0 |
Quoted Prices in Active Markets (Level 1) [Member] | Non-U.S. Agency Mortgage-Backed Securities [Member]
|
|
|
Available-for-sale Securities |
0 |
0 |
Quoted Prices in Active Markets (Level 1) [Member] | Equity Securities [Member]
|
|
|
Available-for-sale Securities |
450 |
333 |
Other Observable Inputs (Level 2) [Member]
|
|
|
Cash and cash equivalents |
791 |
860 |
Total assets at fair value |
18,252 |
17,089 |
Other Observable Inputs (Level 2) [Member] | Debt Securities [Member]
|
|
|
Available-for-sale Securities |
17,444 |
16,227 |
Other Observable Inputs (Level 2) [Member] | U.S. Government and Agency Obligations [Member]
|
|
|
Available-for-sale Securities |
786 |
822 |
Other Observable Inputs (Level 2) [Member] | State and Municipal Obligations [Member]
|
|
|
Available-for-sale Securities |
6,667 |
6,750 |
Other Observable Inputs (Level 2) [Member] | Corporate Obligations [Member]
|
|
|
Available-for-sale Securities |
7,185 |
5,805 |
Other Observable Inputs (Level 2) [Member] | U.S. Agency Mortgage-Backed Securities [Member]
|
|
|
Available-for-sale Securities |
2,238 |
2,353 |
Other Observable Inputs (Level 2) [Member] | Non-U.S. Agency Mortgage-Backed Securities [Member]
|
|
|
Available-for-sale Securities |
568 |
497 |
Other Observable Inputs (Level 2) [Member] | Equity Securities [Member]
|
|
|
Available-for-sale Securities |
3 |
2 |
AARP Program [Member]
|
|
|
Cash and cash equivalents |
230 |
267 |
Total assets at fair value |
2,773 |
2,708 |
Other liabilities |
81 |
76 |
Total liabilities at fair value |
81 |
76 |
AARP Program [Member] | Debt Securities [Member]
|
|
|
Available-for-sale Securities |
2,540 |
2,439 |
AARP Program [Member] | U.S. Government and Agency Obligations [Member]
|
|
|
Available-for-sale Securities |
789 |
780 |
AARP Program [Member] | State and Municipal Obligations [Member]
|
|
|
Available-for-sale Securities |
51 |
25 |
AARP Program [Member] | Corporate Obligations [Member]
|
|
|
Available-for-sale Securities |
1,118 |
1,048 |
AARP Program [Member] | U.S. Agency Mortgage-Backed Securities [Member]
|
|
|
Available-for-sale Securities |
427 |
436 |
AARP Program [Member] | Non-U.S. Agency Mortgage-Backed Securities [Member]
|
|
|
Available-for-sale Securities |
155 |
150 |
AARP Program [Member] | Equity Securities [Member]
|
|
|
Available-for-sale Securities |
3 |
2 |
AARP Program [Member] | Quoted Prices in Active Markets (Level 1) [Member]
|
|
|
Cash and cash equivalents |
230 |
257 |
Total assets at fair value |
775 |
823 |
Other liabilities |
23 |
27 |
Total liabilities at fair value |
23 |
27 |
AARP Program [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Debt Securities [Member]
|
|
|
Available-for-sale Securities |
545 |
566 |
AARP Program [Member] | Quoted Prices in Active Markets (Level 1) [Member] | U.S. Government and Agency Obligations [Member]
|
|
|
Available-for-sale Securities |
545 |
566 |
AARP Program [Member] | Quoted Prices in Active Markets (Level 1) [Member] | State and Municipal Obligations [Member]
|
|
|
Available-for-sale Securities |
0 |
0 |
AARP Program [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Corporate Obligations [Member]
|
|
|
Available-for-sale Securities |
0 |
0 |
AARP Program [Member] | Quoted Prices in Active Markets (Level 1) [Member] | U.S. Agency Mortgage-Backed Securities [Member]
|
|
|
Available-for-sale Securities |
0 |
0 |
AARP Program [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Non-U.S. Agency Mortgage-Backed Securities [Member]
|
|
|
Available-for-sale Securities |
0 |
0 |
AARP Program [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Equity Securities [Member]
|
|
|
Available-for-sale Securities |
0 |
0 |
AARP Program [Member] | Other Observable Inputs (Level 2) [Member]
|
|
|
Cash and cash equivalents |
0 |
10 |
Total assets at fair value |
1,998 |
1,885 |
Other liabilities |
58 |
49 |
Total liabilities at fair value |
58 |
49 |
AARP Program [Member] | Other Observable Inputs (Level 2) [Member] | Debt Securities [Member]
|
|
|
Available-for-sale Securities |
1,995 |
1,873 |
AARP Program [Member] | Other Observable Inputs (Level 2) [Member] | U.S. Government and Agency Obligations [Member]
|
|
|
Available-for-sale Securities |
244 |
214 |
AARP Program [Member] | Other Observable Inputs (Level 2) [Member] | State and Municipal Obligations [Member]
|
|
|
Available-for-sale Securities |
51 |
25 |
AARP Program [Member] | Other Observable Inputs (Level 2) [Member] | Corporate Obligations [Member]
|
|
|
Available-for-sale Securities |
1,118 |
1,048 |
AARP Program [Member] | Other Observable Inputs (Level 2) [Member] | U.S. Agency Mortgage-Backed Securities [Member]
|
|
|
Available-for-sale Securities |
427 |
436 |
AARP Program [Member] | Other Observable Inputs (Level 2) [Member] | Non-U.S. Agency Mortgage-Backed Securities [Member]
|
|
|
Available-for-sale Securities |
155 |
150 |
AARP Program [Member] | Other Observable Inputs (Level 2) [Member] | Equity Securities [Member]
|
|
|
Available-for-sale Securities |
$ 3 |
$ 2 |