Cover Page	12 Months Ended
	May 31, 2026 USD ($) shares
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Current Fiscal Year End Date	--05-31
Document Period End Date	May 31, 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 Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
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
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding | shares	0
Entity Central Index Key	0000070502
Document Fiscal Year Focus	2026
Document Fiscal Period Focus (Q1,Q2,Q3,FY)	FY
Amendment Flag	false
Entity Public Float | $	$ 0
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% issuance 2019
Document Information [Line Items]
Title of 12(b) Security	5.50% Subordinated Notes, due 2064
Trading Symbol	NRUC
Security Exchange Name	NYSE