Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in Carrying Amounts of Goodwill Attributable to Operating Segments

(Dollars in millions)	CB&W		C&CB		IH		Total
Goodwill, January 1, 2018	$	3,907	$	3,938	$	1,773	$	9,618
Mergers and acquisitions	—		—		201		201
Adjustments	(1)		—		—		(1)
Goodwill, December 31, 2018	$	3,906	$	3,938	$	1,974	$	9,818
Mergers and acquisitions	10,134		4,187		21		14,342
Adjustments	—		—		(6)		(6)
Goodwill, December 31, 2019	$	14,040	$	8,125	$	1,989	$	24,154

Identifiable Intangible Assets Subject to Amortization

The following table, which excludes fully amortized intangibles, presents information for identifiable intangible assets:

	Weighted Average Remaining Amortization Period	2019						2018
December 31, (Dollars in millions)		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
CDI	10.3 years	$	2,474	$	(365)	$	2,109	$	605	$	(460)	$	145
Other, primarily client relationship intangibles	10.9	1,808		(775)		1,033		1,329		(716)		613
Total		$	4,282	$	(1,140)	$	3,142	$	1,934	$	(1,176)	$	758

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

The estimated amortization expense of identifiable intangibles for the next five years and thereafter is presented as follows:

Year Ended December 31, (Dollars in millions)
	2020		2021		2022		2023		2024		Thereafter
Estimated amortization expense	$	702	$	527	$	431	$	341	$	273	$	868