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Derivative Instruments and Hedging Activities - Fair Value Hedge Derivatives (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
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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Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk, remaining after discontinued hedge. Excludes cumulative basis adjustment related to foreign exchange risk.

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