Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 331	$ 273
Accumulated Amortization	(175)	(134)
Net Carrying Amount	156	139
Core deposit intangibles
Finite-Lived Intangible Assets
Gross Carrying Amount	229	229
Accumulated Amortization	(153)	(116)
Net Carrying Amount	76	113
Developed technology
Finite-Lived Intangible Assets
Gross Carrying Amount	62
Accumulated Amortization	(3)
Net Carrying Amount	59
Customer relationships
Finite-Lived Intangible Assets
Gross Carrying Amount	25	24
Accumulated Amortization	(7)	(5)
Net Carrying Amount	18	19
Operating leases
Finite-Lived Intangible Assets
Gross Carrying Amount	11	17
Accumulated Amortization	(9)	(12)
Net Carrying Amount	2	5
Other
Finite-Lived Intangible Assets
Gross Carrying Amount	4	3
Accumulated Amortization	(3)	(1)
Net Carrying Amount	$ 1	$ 2