Investment Securities - Schedule Of Amortized Cost And Fair Value By Contractual Maturity (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Held-to-Maturity, Amortized Cost
Within 1 year	$ 0
After 1 year through 5 years	0
After 5 years through 10 years	0
After 10 years	0
Subtotal	0
Government agency issued MBS and CMO	1,371
Total	1,371
Held-to-Maturity, Fair Value
Within 1 year	0
After 1 year through 5 years	0
After 5 years through 10 years	0
After 10 years	0
Subtotal	0
Government agency issued MBS and CMO	1,209
Fair Value	1,209	$ 705
Available-for-Sale, Amortized Cost
Within 1 year	43
After 1 year through 5 years	120
After 5 years through 10 years	394
After 10 years	1,426
Subtotal	1,983
Government agency issued MBS and CMO	8,139
Securities available for sale, amortized cost	10,122
Available-for-Sale, Fair Value
Within 1 year	43
After 1 year through 5 years	115
After 5 years through 10 years	354
After 10 years	1,248
Subtotal	1,760
Government agency issued MBS and CMO	7,076
Securities available-for-sale	$ 8,836	$ 8,707