Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2019	Feb. 06, 2020	Jun. 30, 2019
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Entity Registrant Name	ZIONS BANCORPORATION, NATIONAL ASSOCIATION
Entity Central Index Key	0000109380
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 8,004,067,633
Entity Common Stock, Shares Outstanding		164,919,353
Entity Shell Company	false
Document Annual Report	true
Document Transition Report	false
Entity File Number	001-12307
Entity Address, State or Province	UT
Entity Address, City or Town	Salt Lake City,
Entity Address, Address Line One	One South Main
Entity Tax Identification Number	87-0189025
Entity Incorporation, State or Country Code	X1
Entity Address, Postal Zip Code	84133-1109
City Area Code	(801
Local Phone Number	844-7637
Entity Interactive Data Current	Yes
Subordinated Debt [Member] | NEW YORK STOCK EXCHANGE, INC. [Member]
Document And Entity Information [Abstract]
Trading Symbol	ZIONL
Document Information [Line Items]
Title of 12(b) Security	6.95% Fixed-to-Floating Rate Subordinated Notes due September 15, 2028
Security Exchange Name	NASDAQ
Trading Symbol	ZIONL
Series H Preferred Stock [Member] | NEW YORK STOCK EXCHANGE, INC. [Member]
Document And Entity Information [Abstract]
Trading Symbol	ZIONN
Document Information [Line Items]
Title of 12(b) Security	Series H 5.75% Non-Cumulative Perpetual Preferred Stock
Security Exchange Name	NASDAQ
Trading Symbol	ZIONN
Series G Preferred Stock [Member] | NEW YORK STOCK EXCHANGE, INC. [Member]
Document And Entity Information [Abstract]
Trading Symbol	ZIONO
Document Information [Line Items]
Title of 12(b) Security	Series G Fixed/Floating-Rate Non-Cumulative Perpetual Preferred Stock
Security Exchange Name	NASDAQ
Trading Symbol	ZIONO
Common Stock [Member] | NASDAQ - ALL MARKETS [Member]
Document And Entity Information [Abstract]
Trading Symbol	ZION
Document Information [Line Items]
Title of 12(b) Security	Common Stock, par value $0.001
Security Exchange Name	NASDAQ
Trading Symbol	ZION
Series A Preferred Stock [Member] | NEW YORK STOCK EXCHANGE, INC. [Member]
Document And Entity Information [Abstract]
Trading Symbol	ZIONP
Document Information [Line Items]
Title of 12(b) Security	Series A Floating-Rate Non-Cumulative Perpetual Preferred Stock
Security Exchange Name	NASDAQ
Trading Symbol	ZIONP
Warrant [Member] | NASDAQ - ALL MARKETS [Member]
Document And Entity Information [Abstract]
Trading Symbol	ZIONW
Document Information [Line Items]
Title of 12(b) Security	Warrants to Purchase Common Stock (expiring May 22, 2020)
Security Exchange Name	NASDAQ
Trading Symbol	ZIONW