Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2025	Feb. 13, 2026
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2025
Document Transition Report	false
Entity File Number	001-11241
Entity Registrant Name	CATERPILLAR FINANCIAL SERVICES CORPORATION
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	37-1105865
Entity Address, Address Line One	2120 West End Ave.
Entity Address, City or Town	Nashville
Entity Address, State or Province	TN
Entity Address, Postal Zip Code	37203-0001
City Area Code	615
Local Phone Number	341-1000
Title of 12(b) Security	Medium-Term Notes, Series K,4.850% Notes Due 2029
Trading Symbol	CAT/29
Security Exchange Name	NYSE
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	true
Document Financial Statement Error Correction	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		1
Entity Public Float	$ 0
Entity Central Index Key	0000764764
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2025
Amendment Flag	false