Goodwill and Other Intangible Assets - Gross Carrying Amount, Accumulated Amortization and Net Carrying Amount of Other Intangible Assets (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 3,920	$ 3,897
Accumulated Amortization	(2,427)	(2,353)
Net Carrying Amount	1,493	1,544	$ 1,816
Client relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,745	2,728
Accumulated Amortization	(1,677)	(1,626)
Net Carrying Amount	1,068	1,102
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	402	402
Accumulated Amortization	(188)	(178)
Net Carrying Amount	214	224
Core deposits
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	687	683
Accumulated Amortization	(488)	(477)
Net Carrying Amount	199	206
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	86	84
Accumulated Amortization	(74)	(72)
Net Carrying Amount	$ 12	$ 12