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Derivative Instruments and Hedging Activities - Fair Value Hedge Derivatives (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Carrying amount of hedged asset	$ 14,389	$ 15,686
Carrying amount of hedged liability	(18,733)	(14,908)
Cumulative fair value hedging adjustment included in the amortized cost of hedged assets	113	(292)
Cumulative fair value hedging adjustment included in the carrying value of hedged liabilities	0	(7)
Unallocated portfolio layer method fair value basis adjustments	8	(47)
Cumulative fair value hedging adjustments related to long term debt which hedge accounting has been discontinued, increase in carrying amount	5
Debt Securities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amortized cost basis of closed portfolio hedges	2,600	2,500
Amount of designated hedged items of closed portfolio hedges	2,100	2,000
Unallocated portfolio layer method fair value basis adjustments	8	(47)
Cumulative fair value hedging adjustments related to securities which hedge accounting has been discontinued, reduction of the the amortized cost basis	$ 141	$ 2

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