Goodwill and Other Intangible Assets - Identifiable Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 6,285	$ 5,679
Accumulated Amortization	(2,613)	(2,271)
Net Carrying Amount	3,672	3,408
CDI
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,473	2,563
Accumulated Amortization	(1,403)	(1,190)
Net Carrying Amount	1,070	1,373
Other, primarily client relationship intangibles
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,812	3,116
Accumulated Amortization	(1,210)	(1,081)
Net Carrying Amount	$ 2,602	$ 2,035