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Investment Securities - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Investments, Unrealized Loss Position
Accrued interest receivables on investment securities	$ 211		$ 211		$ 139
Impairment losses	7	$ 0	7	$ 0
Investment securities, fair value	30,100		30,100		28,600
Unrealized losses	3,170		3,170		2,973
Available-for-sale debt securities transferred to held-to-maturity securities
Investments, Unrealized Loss Position
AOCI offset, unamortized portion of unrealized losses on securities	685		685		742
Non-rated Securities
Investments, Unrealized Loss Position
Unrealized losses	$ 24		$ 24		$ 24

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