Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill
Goodwill			$ 5,217
Accumulated impairment losses			(965)
Goodwill [Roll Forward]
Net carrying value, beginning of period	$ 4,258	$ 4,252
Acquisition activity	256	28
Sale of business		(22)
Net carrying value, end of period	4,514	4,258
Commercial Banking
Goodwill
Goodwill			2,704
Accumulated impairment losses			(750)
Goodwill [Roll Forward]
Net carrying value, beginning of period	1,980	1,954
Acquisition activity	0	26
Sale of business		0
Net carrying value, end of period	1,980	1,980
Branch Banking
Goodwill
Goodwill			2,046
Accumulated impairment losses			0
Goodwill [Roll Forward]
Net carrying value, beginning of period	2,047	2,046
Acquisition activity	256	1
Sale of business		0
Net carrying value, end of period	2,303	2,047
Consumer Lending
Goodwill
Goodwill			215
Accumulated impairment losses			(215)
Goodwill [Roll Forward]
Net carrying value, beginning of period	0	0
Acquisition activity	0	0
Sale of business		0
Net carrying value, end of period	0	0
Wealth and Asset Management
Goodwill
Goodwill			252
Accumulated impairment losses			0
Goodwill [Roll Forward]
Net carrying value, beginning of period	231	252
Acquisition activity	0	1
Sale of business		(22)
Net carrying value, end of period	231	231
General Corporate and Other
Goodwill
Goodwill			0
Accumulated impairment losses			$ 0
Goodwill [Roll Forward]
Net carrying value, beginning of period	0	0
Acquisition activity	0	0
Sale of business		0
Net carrying value, end of period	$ 0	$ 0