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Commitments, Contingencies, Guarantees and Others - Unfunded Lending Commitments: Contractual Amount and Carrying Value (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Loss Contingencies [Line Items] |  |
Total unfunded lending commitments, contractual amount | $ 458,054 | $ 441,283
Off-balance sheet lending commitment, carrying value | 103 | 122
Credit Card: |  |
Loss Contingencies [Line Items] |  |
Credit car lines, contractual amount | 411,603 | 392,867
Other loan commitments |  |
Loss Contingencies [Line Items] |  |
Credit car lines, contractual amount | 45,145 | 46,951
Off-balance sheet lending commitment, carrying value | 73 | 99
Advised line of credit | 6,000 | 4,700
Letter of credit |  |
Loss Contingencies [Line Items] |  |
Standby letters of credit and commercial letters of credit, contractual amount | 1,306 | 1,465
Off-balance sheet lending commitment, carrying value | $ 30 | $ 23

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