Cover	9 Months Ended
	Feb. 28, 2026 shares
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Feb. 28, 2026
Document Transition Report	false
Entity File Number	1-7102
Entity Registrant Name	NATIONAL RURAL UTILITIES COOPERATIVE FINANCE CORPORATION
Entity Incorporation, State or Country Code	DC
Entity Tax Identification Number	52-0891669
Entity Address, Address Line One	20701 Cooperative Way,
Entity Address, City or Town	Dulles,
Entity Address, State or Province	VA
Entity Address, Postal Zip Code	20166
City Area Code	(703)
Local Phone Number	467-1800
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding	0
Entity Central Index Key	0000070502
Current Fiscal Year End Date	--05-31
Document Fiscal Year Focus	2026
Document Fiscal Period Focus	Q3
Amendment Flag	false
7.35% Collateral Trust Bonds, due 2026
Document Information [Line Items]
Title of 12(b) Security	7.35% Collateral Trust Bonds, due 2026
Trading Symbol	NRUC 26
Security Exchange Name	NYSE
5.50% Subordinated Notes, due 2064
Document Information [Line Items]
Title of 12(b) Security	5.50% Subordinated Notes, due 2064
Trading Symbol	NRUC
Security Exchange Name	NYSE