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Derivative Instruments - Cumulative Hedging Adjustments and the Carrying Amount of Assets and Liabilities Designated in Fair Value Hedges (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Derivative Instruments, Gain (Loss) [Line Items] |  |
Increase (decrease) in cumulative amount of basis adjustments | $ 304 | $ 13
Available-for-sale investment securities |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Carrying amount of the hedged assets | 26,687 | 29,005
Cumulative hedging adjustment for hedged assets | 257 | (464)
Cumulative hedging adjustment asset related to discontinued hedging relationships | (8) | (72)
Carrying amount of assets related to discontinued hedging relationships | 9,300 | 6,800
Amortized cost of the closed portfolios | 20,800 | 17,500
Amortized cost of the closed portfolios designated as hedged | 10,800 | 11,600
Increase (decrease) in cumulative amount of basis adjustments | 293 | 13
Long-term debt |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Carrying amount of the hedged liabilities | 8,837 | 10,632
Cumulative hedging adjustment for hedged liabilities | 209 | 39
Cumulative hedging adjustment liability related to discontinued hedging relationships | (75) | (149)
Carrying amount of liabilities related to discontinued hedging relationships | $ 16,100 | $ 14,900

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