Derivatives and Hedging Activities - Gain (Loss) from Interest Rate Hedges and Related Hedged Items (Detail) - Fair Value Hedging - Accounted for as hedges - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Derivative [Line Items]
Net gain (loss) on fair value hedges	$ (36)	$ (55)
Interest rates
Derivative [Line Items]
Gains/(losses) on Investments	324	(380)
Change in unrealized gain (loss) on fair value hedges	(802)	1,909
Interest Rate Swaps Hedged Investments
Derivative [Line Items]
Gains/(losses) on Investments	(334)	396
Interest Rate Hedges - Investments
Derivative [Line Items]
Gains/(losses) on Investments	(10)	16
Hedged borrowings and deposits
Derivative [Line Items]
Gain (loss) on hedged item	766	(1,964)
Foreign Exchange Forward
Derivative [Line Items]
Gains/(losses) on Investments	191	(184)
Foreign Currency Hedged Investments
Derivative [Line Items]
Gains/(losses) on Investments	(185)	175
Foreign Currency Hedges - Investments
Derivative [Line Items]
Gains/(losses) on Investments	$ 6	$ (9)

Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

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Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

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