| Cover | Oct. 29, 2019 |
| Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Oct. 29, 2019 |
| Entity Registrant Name | KKR & CO. INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-34820 |
| Entity Tax Identification Number | 26-0426107 |
| Entity Address, Address Line One | 9 West 57th Street |
| Entity Address, Address Line Two | Suite 4200 |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10019 |
| City Area Code | 212 |
| Local Phone Number | 750-8300 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001404912 |
| Amendment Flag | false |
| Class A Common Stock | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Class A Common Stock |
| Trading Symbol | KKR |
| Security Exchange Name | NYSE |
| 6.75% Series A Preferred Stock | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | 6.75% Series A Preferred Stock |
| Trading Symbol | KKR PR A |
| Security Exchange Name | NYSE |
| 6.50% Series B Preferred Stock | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | 6.50% Series B Preferred Stock |
| Trading Symbol | KKR PR B |
| Security Exchange Name | NYSE |
