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Investment Securities - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 31, 2024	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Investments, Unrealized Loss Position
Accrued interest receivables on investment securities		$ 144		$ 144		$ 162
Transfer of available-for-sale securities to held-to-maturity	$ 12,600
OCI, available-for-sale debt securities transferred to held-to-maturity, pretax unrealized losses	$ 994
Impairment losses		0	$ 11	0	$ 21
Investment securities, fair value		27,900		27,900		30,000
Unrealized losses		3,174		3,174		4,337
Available-for-sale debt securities transferred to held-to-maturity securities
Investments, Unrealized Loss Position
AOCI offset, unamortized portion of unrealized losses on securities		774		774		865
Non-rated Securities
Investments, Unrealized Loss Position
Unrealized losses		$ 25		$ 25		$ 34

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AOCI, Debt Securities, Available-for-Sale, Transferred To Held To Maturity, Before Tax

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Interest, dividends, rents, ancillary and other revenues earned but not yet received by the entity on its investments.

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Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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