Goodwill (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill
Goodwill			$ 5,223
Accumulated impairment losses			(965)
Goodwill [Roll Forward]
Net carrying value, beginning of period	$ 4,514	$ 4,258
Acquisition activity	450	256
Reallocation of goodwill	0
Sale of businesses	(39)
Net carrying value, end of period	4,925	4,514
Operating Segments | Commercial Banking
Goodwill
Goodwill			2,730
Accumulated impairment losses			(750)
Goodwill [Roll Forward]
Net carrying value, beginning of period	1,980	1,980
Acquisition activity	0	0
Reallocation of goodwill	378
Sale of businesses	(34)
Net carrying value, end of period	2,324	1,980
Operating Segments | Consumer and Small Business Banking
Goodwill
Goodwill			2,262
Accumulated impairment losses			(215)
Goodwill [Roll Forward]
Net carrying value, beginning of period	2,303	2,047
Acquisition activity	450	256
Reallocation of goodwill	(378)
Sale of businesses	0
Net carrying value, end of period	2,375	2,303
Operating Segments | Wealth and Asset Management
Goodwill
Goodwill			231
Accumulated impairment losses			0
Goodwill [Roll Forward]
Net carrying value, beginning of period	231	231
Acquisition activity	0	0
Reallocation of goodwill	0
Sale of businesses	(5)
Net carrying value, end of period	226	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
Reallocation of goodwill	0
Sale of businesses	0
Net carrying value, end of period	$ 0	$ 0