Securities - Schedule of Securities by Maturity (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Securities Available for Sale, Amortized Cost
Due in one year or less	$ 3,398
Due after one through five years	13,420
Due after five through ten years	18,805
Due after ten years	8,513
Total	44,136
Securities Available for Sale, Fair Value
Due in one year or less	3,290
Due after one through five years	12,304
Due after five through ten years	15,667
Due after ten years	6,647
Total	37,908	$ 39,117
Held-to-Maturity Securities, Amortized Cost
Due in one year or less	18
Due after one through five years	5,185
Due after five through ten years	2,737
Due after ten years	1,249
Total	9,189	8,710
Held-to-Maturity Securities, Fair Value
Due in one year or less	18
Due after one through five years	4,869
Due after five through ten years	2,513
Due after ten years	1,175
Total	$ 8,575	$ 8,113