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Accounting Policies (Details) $ in Millions | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) country | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2021 USD ($)
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Number of countries outside the US where strategic international offices are held | country | 4 |  |  |  |  |
Allowance for loan and lease losses | $ (4,767) | $ (4,737) | $ (4,741) | $ (4,581) | $ (4,462) | $ (4,868)
Retained earnings | $ 56,170 |  | 53,572 |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses |  |  | 35 |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2022-02 |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses |  |  | 35 |  |  |
Retained earnings |  |  | $ 26 |  |  |

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