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	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Derivative [Line Items]
Net gain (loss) on fair value hedges	$ (347)	$ (400)	$ (485)
Interest rates
Derivative [Line Items]
Gains/(losses) on Investments	(535)	63	(109)
Change in unrealized gain (loss) on fair value hedges	3,003	(581)	3,859
Interest Rate Swaps Hedged Investments
Derivative [Line Items]
Gains/(losses) on Investments	557	(80)	111
Interest Rate Hedges - Investments
Derivative [Line Items]
Gains/(losses) on Investments	22	(17)	2
Hedged borrowings and deposits
Derivative [Line Items]
Gain (loss) on hedged item	(3,350)	181	(4,344)
Foreign Exchange Forward
Derivative [Line Items]
Gains/(losses) on Investments	(397)	91	(127)
Foreign Currency Hedged Investments
Derivative [Line Items]
Gains/(losses) on Investments	419	(85)	125
Foreign Currency Hedges - Investments
Derivative [Line Items]
Gains/(losses) on Investments	$ 22	$ 6	$ (2)

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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