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Derivatives and Hedging Activities - Summary of Derivatives Bifurcated from their Related Borrowings (Detail) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Derivative [Line Items]
Fair value of assets	$ 423	$ 467
Fair value of liabilities	(280)	(175)
Net asset/(liability)	143	292
Notional amount	46,956,210	37,127,322
Embedded Derivatives Classified In Debt
Derivative [Line Items]
Notional amount	$ 8,261	$ 8,106

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