Goodwill (Tables)

12 Months Ended

Dec. 31, 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 years ended December 31, 2020 and 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 amount as of December 31, 2018	$	630	1,655	—	193	—	2,478
Acquisition activity	1,324		391	—	62	—	1,777
Sale of business	—		—	—	(3)	—	(3)
Net carrying amount as of December 31, 2019	$	1,954	2,046	—	252	—	4,252
Acquisition activity	26		1	—	1	—	28
Sale of business	—		—	—	(22)	—	(22)
Net carrying amount as of December 31, 2020	$	1,980	2,047	—	231	—	4,258