Goodwill and Intangible Assets - Components (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Intangible Assets by Major Class [Line Items]
Goodwill, gross	$ 14,777	$ 14,782
Goodwill	14,777	14,782	$ 14,653	$ 14,653
Intangible assets, gross (excluding Goodwill)	342	242
Accumulated amortization	(183)	(131)
Intangible assets, net (excluding Goodwill)	159	111
Intangible assets gross including Goodwill	15,119	15,024
Total goodwill and other intangible assets, net carrying value	14,936	14,893
Commercial MSRs, gross	660	622
Commercial MSR, accumulated amortization	(223)	(202)
Total commercial MSRs	437	420
Amortization expense for amortizable intangible assets	$ 93	$ 79
Finite-Lived Intangible Assets, Remaining Amortization Period	7 years 3 months 18 days	4 years 4 months 24 days
PCCR intangibles
Schedule of Intangible Assets by Major Class [Line Items]
Intangible assets, gross (excluding Goodwill)	$ 147	$ 29
Accumulated amortization	(26)	(10)
Intangible assets, net (excluding Goodwill)	$ 121	$ 19
Finite-Lived Intangible Assets, Remaining Amortization Period	7 years 9 months 18 days	5 years 10 months 24 days
Other intangible assets
Schedule of Intangible Assets by Major Class [Line Items]
Intangible assets, gross (excluding Goodwill)	$ 195	$ 213
Accumulated amortization	(157)	(121)
Intangible assets, net (excluding Goodwill)	$ 38	$ 92
Finite-Lived Intangible Assets, Remaining Amortization Period	5 years 4 months 24 days	4 years 1 month 6 days