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v3.20.2

New Accounting Standards (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Jan. 01, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Reduction to income | $ (254) | $ (249) | $ (688) | $ (624) |
Accounting Standards Update [Extensible List] |  |  | us-gaap:AccountingStandardsUpdate201613Member |  |
Cumulative effect of change in accounting principle |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Tax impact of ASU 2016-13 |  |  |  |  | $ 14
Financing Receivables and Unfunded Loan Commitments | Cumulative effect of change in accounting principle |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for expected credit losses |  |  |  |  | $ 65
Accounting Standards Update 2016-13 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Reduction to income |  |  | $ 15 |  |

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