Goodwill and Intangible Assets - Components (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Intangible Assets by Major Class [Line Items]
Goodwill, gross	$ 14,782	$ 14,653
Goodwill	14,782	14,653	$ 14,653	$ 14,544
Intangible assets, gross (excluding Goodwill)	242	396
Accumulated amortization	(131)	(306)
Intangible assets, net (excluding Goodwill)	111	90
Intangible assets gross including Goodwill	15,024	15,049
Total goodwill and other intangible assets, net carrying value	14,893	14,743
Commercial MSRs, gross	622	542
Commercial MSR, accumulated amortization	(202)	(175)
Total commercial MSRs	$ 420	$ 367
Finite-Lived Intangible Assets, Remaining Amortization Period	4 years 4 months 24 days	7 years 1 month 6 days
Amortization expense for amortizable intangible assets	$ 79	$ 69
PCCR intangibles
Schedule of Intangible Assets by Major Class [Line Items]
Intangible assets, gross (excluding Goodwill)	29	148
Accumulated amortization	(10)	(138)
Intangible assets, net (excluding Goodwill)	$ 19	$ 10
Finite-Lived Intangible Assets, Remaining Amortization Period	5 years 10 months 24 days	6 years 2 months 12 days
Other intangible assets
Schedule of Intangible Assets by Major Class [Line Items]
Intangible assets, gross (excluding Goodwill)	$ 213	$ 248
Accumulated amortization	(121)	(168)
Intangible assets, net (excluding Goodwill)	$ 92	$ 80
Finite-Lived Intangible Assets, Remaining Amortization Period	4 years 1 month 6 days	7 years 3 months 18 days