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Investment Securities - Narrative (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items] |  |
Held to maturity securities, assets pledged | $ 136,693,000,000 | $ 146,453,000,000
Available for sale securities, assets pledged | 62,308,000,000 | 82,994,000,000
Credit loss expense | 0 | 0
Writedown to fair value | 0 | 0
Available for sale, allowance for credit loss | 0 | 0
Held to maturity securities, allowance for credit loss | 0 | 0
Accrued interest receivable | 372,000,000 | 455,000,000
Write-off of accrued interest receivable on available for sale and held to maturity securities | 0 | 0
Asset Pledged as Collateral |  |
Debt Securities, Available-for-sale [Line Items] |  |
Held to maturity securities, assets pledged | 2,047,000,000 | 5,920,000,000
Available for sale securities, assets pledged | 311,000,000 | 378,000,000
Asset Pledged as Collateral | Interest rate swaps |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for sale securities, assets pledged | 311,000,000 | 378,000,000
Federal Home Loan Bank Advances |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value of pledged securities | 60,700,000,000 |
Collateral value of pledged securities | 56,300,000,000 |
Federal Reserve Bank Advances |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value of pledged securities | 30,800,000,000 |
Collateral value of pledged securities | 29,700,000,000 |
Deposits |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value of pledged securities | 1,700,000,000 |
Collateral value of pledged securities | 1,700,000,000 |
U.S. agency mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Held to maturity securities, assets pledged | 136,693,000,000 | 146,453,000,000
Available for sale securities, assets pledged | 44,456,000,000 | $ 51,833,000,000
U.S. agency mortgage-backed securities | Asset Pledged as Collateral | Securities Sold under Agreements to Repurchase |  |
Debt Securities, Available-for-sale [Line Items] |  |
Held to maturity securities, assets pledged | 4,100,000,000 |
Held to maturity securities, assets pledged that may be sold, repledged, or utilized | $ 2,000,000,000.0 |

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