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New Accounting Standards (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Allowance for credit loss | $ 123 | $ 33 | $ 24 |
Reduction to income | (885) | $ (829) | $ (774) |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Tax impact of ASU 2016-13 |  |  |  | $ 14
Cumulative Effect, Period of Adoption, Adjustment | Financing Receivables And Unfunded Loan Commitments |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Allowance for credit loss |  |  |  | $ 65
Accounting Standards Update 2016-13 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Reduction to income | $ 21 |  |  |

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