Derivative Instruments and Hedging Activities - Fair Value Hedge Derivatives (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Carrying amount of hedged asset	$ 11,245	$ 12,249
Carrying amount of hedged liability	(21,468)	(20,726)
Cumulative fair value hedging adjustment included in the amortized cost of hedged assets	(67)	(16)
Cumulative fair value hedging adjustment included in the carrying value of hedged liabilities	235	(6)
Unallocated portfolio layer method fair value basis adjustments, (reduction) increase	(4)	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	685	1,100
Amount of designated hedged items of closed portfolio hedges	416	771
Unallocated portfolio layer method fair value basis adjustments, (reduction) increase	(4)	2
Cumulative fair value hedging adjustments related to securities which hedge accounting has been discontinued, reduction of the the amortized cost basis	$ 73	$ 26

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

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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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Amortized cost of closed portfolio of financial asset used to designate hedging relationship in which hedged item is expected to be outstanding for designated hedged period.

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