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Derivative Financial Instruments - Terminated Cash Flow and Fair Value Hedges (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2026 | Dec. 31, 2025
Derivative [Line Items] |  |
Deferred gains recorded in AOCI | $ 318 | $ 335
Swaps hedging commercial loans |  |
Derivative [Line Items] |  |
Net unrecognized after-tax gain (loss) on active hedges recorded in AOCI | $ (1,035) | $ (173)
Maximum length of time over which forecasted cash flows are hedged | 4 years | 5 years
Fair Value Hedges |  |
Derivative [Line Items] |  |
Net unrecognized pre-tax gain (loss) on terminated hedges | $ 38 | $ (56)

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