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Commitments, Contingencies, Guarantees and Others - Unfunded Lending Commitments: Contractual Amount and Carrying Value (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Loss Contingencies [Line Items] |  |
Total unfunded lending commitments, contractual amount | $ 458,869 | $ 441,283
Off-balance sheet lending commitment, carrying value | 99 | 122
Credit Card: |  |
Loss Contingencies [Line Items] |  |
Credit car lines, contractual amount | 412,905 | 392,867
Other loan commitments |  |
Loss Contingencies [Line Items] |  |
Credit car lines, contractual amount | 44,698 | 46,951
Off-balance sheet lending commitment, carrying value | 72 | 99
Advised line of credit | 5,000 | 4,700
Letter of credit |  |
Loss Contingencies [Line Items] |  |
Standby letters of credit and commercial letters of credit, contractual amount | 1,266 | 1,465
Off-balance sheet lending commitment, carrying value | $ 27 | $ 23

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