Derivative Instruments and Hedging Activities - Fair Value Hedge Derivatives (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Carrying amount of hedged asset	$ 11,216	$ 12,249
Carrying amount of hedged liability	(19,370)	(20,726)
Cumulative fair value hedging adjustment included in the amortized cost of hedged assets	(38)	(16)
Cumulative fair value hedging adjustment included in the carrying value of hedged liabilities	101	(6)
Unallocated portfolio layer method fair value basis adjustments, (reduction) increase	(2)	2
Long-term debt
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cumulative fair value hedging adjustments related to long term debt which hedge accounting has been discontinued, increase in carrying amount	4	5
Debt Securities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amortized cost basis of closed portfolio hedges	995	1,100
Amount of designated hedged items of closed portfolio hedges	663	771
Unallocated portfolio layer method fair value basis adjustments, (reduction) increase	(2)	2
Cumulative fair value hedging adjustments related to securities which hedge accounting has been discontinued, reduction of the the amortized cost basis	$ 30	$ 26

Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease), Excluding Discontinued Hedges

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