Cover - USD ($)	12 Months Ended
	Dec. 31, 2020	Feb. 08, 2021	Jun. 30, 2020
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-12307
Entity Registrant Name	ZIONS BANCORPORATION, NATIONAL ASSOCIATION
Entity Incorporation, State or Country Code	X1
Entity Tax Identification Number	87-0189025
Entity Address, Address Line One	One South Main
Entity Address, City or Town	Salt Lake City,
Entity Address, State or Province	UT
Entity Address, Postal Zip Code	84133-1109
City Area Code	801
Local Phone Number	844-7637
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 5,470,950,404
Entity Common Stock, Shares Outstanding		164,214,100
Documents Incorporated by Reference	Documents Incorporated by Reference: Part III of this Annual Report on Form 10-K incorporates by reference specified portions of Zions Bancorporation, National Association's Proxy Statement for its 2021 Annual Meeting of Shareholders, which the registrant anticipates will be filed with the Securities and Exchange Commission approximately March 18, 2021.
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Central Index Key	0000109380
Common stock | The NASDAQ Stock Market LLC
Document Information [Line Items]
Title of 12(b) Security	Common Stock, par value $0.001
Trading Symbol	ZION
Security Exchange Name	NASDAQ
Series A Floating-Rate Non-Cumulative Perpetual Preferred Stock | The NASDAQ Stock Market LLC
Document Information [Line Items]
Title of 12(b) Security	Series A Floating-Rate Non-Cumulative Perpetual Preferred Stock
Trading Symbol	ZIONP
Security Exchange Name	NASDAQ
Series G Fixed/Floating-Rate Non-Cumulative Perpetual Preferred Stock | The NASDAQ Stock Market LLC
Document Information [Line Items]
Title of 12(b) Security	Series G Fixed/Floating-Rate Non-Cumulative Perpetual Preferred Stock
Trading Symbol	ZIONO
Security Exchange Name	NASDAQ
Series H 5.75% Non-Cumulative Perpetual Preferred Stock | The NASDAQ Stock Market LLC
Document Information [Line Items]
Title of 12(b) Security	Series H 5.75% Non-Cumulative Perpetual Preferred Stock
Trading Symbol	ZIONN
Security Exchange Name	NASDAQ
6.95% Fixed-to-Floating Rate Subordinated Notes due September 15, 2028 | The NASDAQ Stock Market LLC
Document Information [Line Items]
Title of 12(b) Security	6.95% Fixed-to-Floating Rate Subordinated Notes due September 15, 2028
Trading Symbol	ZIONL
Security Exchange Name	NASDAQ