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| <dei:SecurityExchangeName contextRef="duration_2020-11-07_to_2020-11-07_us-gaap-StatementClassOfStockAxis_brka-MOnePointOneTwoFiveSeniorNotesDueTwoThousandTwentySevenMember"> NYSE </dei:SecurityExchangeName> |
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| <dei:SecurityExchangeName contextRef="duration_2020-11-07_to_2020-11-07_us-gaap-StatementClassOfStockAxis_brka-MOnePointSixTwoFiveSeniorNotesDueTwoThousandThirtyFiveMember"> NYSE </dei:SecurityExchangeName> |
| <dei:Security12bTitle contextRef="duration_2020-11-07_to_2020-11-07_us-gaap-StatementClassOfStockAxis_brka-MOnePointThreeZeroZeroSeniorNotesDueTwoThousandTwentyFourMember"> 1.300% Senior Notes due 2024 </dei:Security12bTitle> |
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| <dei:SecurityExchangeName contextRef="duration_2020-11-07_to_2020-11-07_us-gaap-StatementClassOfStockAxis_brka-MOnePointThreeZeroZeroSeniorNotesDueTwoThousandTwentyFourMember"> NYSE </dei:SecurityExchangeName> |
| <dei:Security12bTitle contextRef="duration_2020-11-07_to_2020-11-07_us-gaap-StatementClassOfStockAxis_brka-MTwoPointOneFiveZeroSeniorNotesDueTwoThousandTwentyEightMember"> 2.150% Senior Notes due 2028 </dei:Security12bTitle> |
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| <dei:SecurityExchangeName contextRef="duration_2020-11-07_to_2020-11-07_us-gaap-StatementClassOfStockAxis_brka-MTwoPointOneFiveZeroSeniorNotesDueTwoThousandTwentyEightMember"> NYSE </dei:SecurityExchangeName> |
| <dei:Security12bTitle contextRef="duration_2020-11-07_to_2020-11-07_us-gaap-StatementClassOfStockAxis_brka-MZeroPointTwoFiveZeroSeniorNotesDueTwoThousandTwentyOneMember"> 0.250% Senior Notes due 2021 </dei:Security12bTitle> |
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