Goodwill and Other Intangible Assets - Components (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Goodwill
Carrying Amount of Assets	$ 15,062	$ 15,065
Net Carrying Amount	15,062	15,065
Other intangible assets:
Carrying Amount of Assets	503	540
Accumulated Amortization	(213)	(230)
Net Carrying Amount	290	310
Total goodwill and other intangible assets
Carrying Amount of Assets	15,565	15,605
Net Carrying Amount	15,352	15,375
Commercial MSRs
Carrying Amount of Assets	654	653
Accumulated Amortization	(277)	(263)
Net Carrying Amount	377	390
Purchased credit card relationship (“PCCR”) intangibles
Other intangible assets:
Carrying Amount of Assets	369	369
Accumulated Amortization	(113)	(96)
Net Carrying Amount	256	273
Other
Other intangible assets:
Carrying Amount of Assets	134	171
Accumulated Amortization	(100)	(134)
Net Carrying Amount	$ 34	$ 37