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Goodwill (Tables)
 9 Months Ended
Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in the Net Carrying Amount of Goodwill by Reporting Segment
Changes in the net carrying amount of goodwill, by reporting unit, for the nine months ended September 30, 2021 and the year ended December 31, 2020 were as follows:
($ in millions)Commercial
Banking		Branch
Banking		Consumer
Lending		Wealth
and Asset
Management		General
Corporate
and Other		Total
Goodwill$2,704 2,046 215 252 — 5,217 
Accumulated impairment losses(750)— (215)— — (965)
Net carrying value as of December 31, 2019$1,954 2,046 — 252 — 4,252 
Acquisition activity26 1 — 1 — 28 
Sale of business— — — (22)— (22)
Net carrying value as of December 31, 2020$1,980 2,047 — 231 — 4,258 
Acquisition activity1 255 — — — 256 
Net carrying value as of September 30, 2021$1,981 2,302 — 231 — 4,514