Goodwill and Intangible Assets - Components (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Schedule of Intangible Assets by Major Class [Line Items]
Goodwill, gross	$ 15,048		$ 15,048		$ 14,777
Goodwill	15,048		15,048		14,777
Intangible assets, gross (excluding Goodwill)	540		540		342
Accumulated amortization	(208)		(208)		(183)
Intangible assets, net (excluding Goodwill)	332		332		159
Intangible assets gross including Goodwill	15,588		15,588		15,119
Total goodwill and other intangible assets, net carrying value	15,380		15,380		14,936
Commercial MSRs, gross	654		654		660
Commercial MSR, accumulated amortization	(249)		(249)		(223)
Total commercial MSRs	405		405		437
Amortization of Intangibles	24	$ 17	60	$ 45
PCCR intangibles
Schedule of Intangible Assets by Major Class [Line Items]
Intangible assets, gross (excluding Goodwill)	369		369		147
Accumulated amortization	(76)		(76)		(26)
Intangible assets, net (excluding Goodwill)	293		293		121
Other intangible assets
Schedule of Intangible Assets by Major Class [Line Items]
Intangible assets, gross (excluding Goodwill)	171		171		195
Accumulated amortization	(132)		(132)		(157)
Intangible assets, net (excluding Goodwill)	$ 39		$ 39		$ 38