Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets and Related Accumulated Amortization

Core deposit and other intangible assets and related accumulated amortization are as follows at December 31:

	Gross carrying amount				Accumulated amortization				Net carrying amount
(In millions)	2020		2019		2020		2019		2020		2019
Core deposit intangibles	$	167	$	167	$	(167)	$	(167)	$	—	$	—
Customer relationships and other intangibles	30		28		(28)		(28)		2		—
Total	$	197	$	195	$	(195)	$	(195)	$	2	$	—

Schedule of Goodwill

Changes in the carrying amount of goodwill for operating segments with goodwill are as follows:

(In millions)	Zions Bank		CB&T		Amegy		Consolidated Bank
Balance at December 31, 2018	$	20	$	379	$	615	$	1,014
Impairment losses	—		—		—		—
Balance at December 31, 2019	20		379		615		1,014
Impairment losses	—		—		—		—
Balance at December 31, 2020	$	20	$	379	$	615	$	1,014