Securities - Schedule of Securities by Maturity (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Securities Available for Sale, Amortized Cost
Due in one year or less	$ 1,944
Due after one through five years	15,833
Due after five through ten years	21,477
Due after ten years	5,925
Total	45,179
Securities Available for Sale, Fair Value
Due in one year or less	1,887
Due after one through five years	14,676
Due after five through ten years	18,176
Due after ten years	4,759
Total	39,498	$ 39,117
Held-to-Maturity Securities, Amortized Cost
Due in one year or less	21
Due after one through five years	5,497
Due after five through ten years	3,191
Due after ten years	852
Total	9,561	8,710
Held-to-Maturity Securities, Fair Value
Due in one year or less	21
Due after one through five years	5,222
Due after five through ten years	3,023
Due after ten years	819
Total	$ 9,085	$ 8,113