Goodwill and Other Intangibles (Amortized Intangible Assets) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross Cost	$ 4,244	$ 4,431
Accumulated Amortization	1,706	1,621
Net Carrying Amount	2,538	2,810
Client relationships
Finite-Lived Intangible Assets [Line Items]
Gross Cost	3,887	4,066
Accumulated Amortization	1,412	1,334
Net Carrying Amount	2,475	2,732
Other
Finite-Lived Intangible Assets [Line Items]
Gross Cost	357	365
Accumulated Amortization	294	287
Net Carrying Amount	$ 63	$ 78