Goodwill and Other Intangible Assets - Gross Carrying Amount, Accumulated Amortization and Net Carrying Amount of Other Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 3,806	$ 3,981
Accumulated Amortization	(2,238)	(2,165)
Net Carrying Amount	1,568	1,816	$ 1,827
Client relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,655	2,786
Accumulated Amortization	(1,543)	(1,497)
Net Carrying Amount	1,112	1,289
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	399	403
Accumulated Amortization	(166)	(142)
Net Carrying Amount	233	261
Core deposits
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	666	696
Accumulated Amortization	(457)	(451)
Net Carrying Amount	209	245
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	86	96
Accumulated Amortization	(72)	(75)
Net Carrying Amount	$ 14	$ 21