| Cover Page | Oct. 28, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Oct. 28, 2021 |
| Entity Registrant Name | CATERPILLAR FINANCIAL SERVICES CORPORATION |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-11241 |
| Entity Tax Identification Number | 37-1105865 |
| Entity Address, Address Line One | 2120 West End Avenue |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Medium-Term Notes, Series H,3.300% Notes Due 2024 |
| Trading Symbol | CAT/24 |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000764764 |
| Amendment Flag | false |
