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Loans - Additional Information (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($) segment | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Number of portfolio segments | segment | 3 |  |
Accrued interest receivable | $ 2,200 | $ 2,200 |
Net loans held for investment | 311,517 | 305,176 |
Loans held for sale | $ 202 | 854 |
Financing Receivable, Pledged Status [Extensible Enumeration] | Asset Pledged as Collateral [Member] |  |
Commercial and multifamily real estate |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Payment for origination, loan, mortgage, held-for-sale | $ 3,300 | 4,400 | $ 8,600
Federal Home Loan banks |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Net loans held for investment | 6,700 | 7,400 |
Remaining borrowing capacity | 35,100 | 32,100 |
Federal Reserve Discount Window |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Net loans held for investment | 80,200 | 78,300 |
Remaining borrowing capacity | 46,700 | 41,400 |
Domestic credit card: | Domestic Credit Card and Commercial Banking Portfolios |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving loans converted to term during period | $ 847 | $ 617 |

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