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Goodwill (Tables)
 9 Months Ended
Sep. 30, 2020
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, 2020 and the year ended December 31, 2019 were as follows:
($ in millions)Commercial
Banking		Branch
Banking		Consumer
Lending		Wealth
and Asset
Management		General
Corporate
and Other		Total
Goodwill$1,380 1,655 215 193 — 3,443 
Accumulated impairment losses(750)— (215)— — (965)
Net carrying value as of December 31, 2018$630 1,655 — 193 — 2,478 
Acquisition activity1,324 391 — 62 — 1,777 
Sale of business— — — (3)— (3)
Net carrying value as of December 31, 2019$1,954 2,046 — 252 — 4,252 
Acquisition activity7 1 — 1 — 9 
Net carrying value as of September 30, 2020$1,961 2,047 — 253 — 4,261