NET INCOME (LOSS) ATTRIBUTABLE TO KKR & CO. INC. PER SHARE OF CLASS A COMMON STOCK (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
NET INCOME (LOSS) ATTRIBUTABLE TO KKR & CO. INC. PER SHARE OF CLASS A COMMON STOCK
Preferred stock dividend rate (as a percent)										7.375%
Weighted Average KKR Holdings Units
Weighted Average KKR Holdings Units (in shares)									296,445,196	314,458,757	344,422,095
Class A Common Stock
NET INCOME (LOSS) ATTRIBUTABLE TO KKR & CO. INC. PER SHARE OF CLASS A COMMON STOCK
Net Income (Loss) Attributable to KKR & Co. Inc. Class A Common Stockholders	$ 515,101	$ 241,213	$ 514,393	$ 700,978	$ (392,982)	$ 640,198	$ 680,381	$ 170,102	$ 1,971,685	$ 1,097,699	$ 984,941
Excess of carrying value over consideration transferred on redemption of KFN 7.375% Series A LLC Preferred Shares									0	3,102	0
Net Income (Loss) Available to KKR & Co. Inc. Class A Common Stockholders									$ 1,971,685	$ 1,100,801	$ 984,941
Basic Net Income (Loss) Per Share of Class A Common Stock
Weighted Average Shares of Class A Common Stock Outstanding - Basic (in shares)	555,379,973	546,336,936	544,528,863	533,892,474	532,266,521	525,240,214	510,586,631	487,704,838	545,096,999	514,102,571	468,282,642
Net Income (Loss) Attributable to KKR & Co. Inc. Per Share of Class A Common Stock - Basic (in dollars per share)	$ 0.93	$ 0.44	$ 0.94	$ 1.31	$ (0.74)	$ 1.22	$ 1.33	$ 0.36	$ 3.62	$ 2.14	$ 2.10
Diluted Net Income (Loss) Per Share of Class A Common Stock
Weighted Average Shares of Class A Common Stock Outstanding - Basic (in shares)	555,379,973	546,336,936	544,528,863	533,892,474	532,266,521	525,240,214	510,586,631	487,704,838	545,096,999	514,102,571	468,282,642
Weighted Average Unvested Shares of Class A Common Stock and Other Exchangeable Securities (in shares)									12,590,513	19,604,468	38,006,329
Weighted Average Shares of Class A Common Stock Outstanding - Diluted (in shares)	566,277,984	559,532,065	554,643,810	550,046,440	532,266,521	545,672,953	548,745,498	535,918,274	557,687,512	533,707,039	506,288,971
Net Income (Loss) Attributable to KKR & Co. Inc. Per Share of Class A Common Stock - Diluted (in dollars per share)	$ 0.91	$ 0.43	$ 0.93	$ 1.27	$ (0.74)	$ 1.17	$ 1.24	$ 0.32	$ 3.54	$ 2.06	$ 1.95
Class A Common Stock | Market Condition Awards
Weighted Average KKR Holdings Units
Weighted Average KKR Holdings Units (in shares)									5,000,000.0	5,000,000	5,000,000