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Commitments, Contingencies, Guarantees and Others - Unfunded Lending Commitments: Contractual Amount and Carrying Value (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Loss Contingencies [Line Items] |  |
Total unfunded lending commitments, contractual amount | $ 459,213 | $ 441,283
Off-balance sheet lending commitment, carrying value | 93 | 122
Credit Card: |  |
Loss Contingencies [Line Items] |  |
Credit car lines, contractual amount | 412,030 | 392,867
Other loan commitments |  |
Loss Contingencies [Line Items] |  |
Credit car lines, contractual amount | 45,823 | 46,951
Off-balance sheet lending commitment, carrying value | 68 | 99
Advised line of credit | 5,300 | 4,700
Letter of credit |  |
Loss Contingencies [Line Items] |  |
Standby letters of credit and commercial letters of credit, contractual amount | 1,360 | 1,465
Off-balance sheet lending commitment, carrying value | $ 25 | $ 23

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