Goodwill and Intangible Assets - Components (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Schedule of Intangible Assets by Major Class [Line Items]
Goodwill, gross	$ 14,784	$ 14,782
Goodwill	14,784	14,782
Intangible assets, gross (excluding Goodwill)	242	242
Accumulated amortization	(145)	(131)
Intangible assets, net (excluding Goodwill)	97	111
Intangible assets gross including Goodwill	15,026	15,024
Total goodwill and other intangible assets, net carrying value	14,881	14,893
Commercial MSRs, gross	641	622
Commercial MSR, accumulated amortization	(210)	(202)
Total commercial MSRs	431	420
PCCR intangibles
Schedule of Intangible Assets by Major Class [Line Items]
Intangible assets, gross (excluding Goodwill)	29	29
Accumulated amortization	(12)	(10)
Intangible assets, net (excluding Goodwill)	17	19
Other intangible assets
Schedule of Intangible Assets by Major Class [Line Items]
Intangible assets, gross (excluding Goodwill)	213	213
Accumulated amortization	(133)	(121)
Intangible assets, net (excluding Goodwill)	$ 80	$ 92