Investment Securities - Amortized Cost and Fair Value of Available-for-Sale Debt and Held-to-Maturity Securities (Details) - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021
Available-for-Sale Debt and Other, Amortized Cost
Due in 1 year or less		$ 381
Due after 1 year through 5 years		13,506
Due after 5 years through 10 years		31,661
Due after 10 years		11,108
Other securities		874
Amortized Cost		57,530	$ 36,941
Available-for-Sale Debt and Other, Fair Value
Due in 1 year or less		374
Due after 1 year through 5 years		12,557
Due after 5 years through 10 years		28,101
Due after 10 years		9,597
Other securities		874
Fair Value	[1]	51,503	38,110
Held-to-Maturity, Amortized Cost
Due in 1 year or less		3
Due after 1 year through 5 years		0
Due after 5 years through 10 years		0
Due after 10 years		2
Other securities		0
Amortized Cost	[2]	5	8
Held-to-Maturity, Fair Value
Due in 1 year or less		3
Due after 1 year through 5 years		0
Due after 5 years through 10 years		0
Due after 10 years		2
Other securities		0
Fair Value		$ 5	$ 8

[1] Amortized cost of $57,530 and $36,941 at December 31, 2022 and 2021, respectively.

[2] Fair value of $5 and $8 at December 31, 2022 and 2021, respectively.