Goodwill and Other Intangible Assets - Identifiable Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 6,296	$ 5,679
Accumulated Amortization	(2,570)	(2,271)
Net Carrying Amount	3,726	3,408
CDI
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,472	2,563
Accumulated Amortization	(1,328)	(1,190)
Net Carrying Amount	1,144	1,373
Other, primarily client relationship intangibles
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,824	3,116
Accumulated Amortization	(1,242)	(1,081)
Net Carrying Amount	$ 2,582	$ 2,035