Investment Securities - Schedule Of Amortized Cost And Fair Value By Contractual Maturity (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
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	1,323
Total	1,323
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	1,161
Fair Value	1,161	$ 1,209
Available-for-Sale, Amortized Cost
Within 1 year	36
After 1 year through 5 years	99
After 5 years through 10 years	397
After 10 years	1,416
Subtotal	1,948
Government agency issued MBS and CMO	7,548
Securities available for sale, amortized cost	9,496
Available-for-Sale, Fair Value
Within 1 year	36
After 1 year through 5 years	95
After 5 years through 10 years	364
After 10 years	1,266
Subtotal	1,761
Government agency issued MBS and CMO	6,630
Securities available-for-sale	$ 8,391	$ 8,836