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Derivative Instruments and Hedging Activities - Fair Value Hedge Derivatives (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Carrying amount of hedged asset | $ 14,027 | $ 15,686
Carrying amount of hedged liability | (18,741) | (14,908)
Cumulative fair value hedging adjustment included in the amortized cost of hedged AFS securities | 115 | (292)
Cumulative fair value hedging adjustment included in the carrying value of hedged long-term debt | 9 | (7)
Unallocated portfolio layer method fair value basis adjustments | 9 | (47)
Debt Securities |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Amortized cost basis of closed portfolio hedges | 2,700 | 2,500
Amount of designated hedged items of closed portfolio hedges | 2,100 | 2,000
Unallocated portfolio layer method fair value basis adjustments | 9 | (47)
Cumulative fair value hedging adjustments related to securities which hedge accounting has been discontinued, reduction of the the amortized cost basis | $ 150 | $ 2

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