NET INCOME (LOSS) ATTRIBUTABLE TO KKR & CO. INC. PER SHARE OF COMMON STOCK (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
	Aug. 14, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
NET INCOME (LOSS) ATTRIBUTABLE TO KKR & CO. INC. PER SHARE OF COMMON STOCK
Accumulated Series C Mandatory Convertible Preferred Dividend (if dilutive)		$ 8,817	$ 0	$ 0	$ 0
Net Income (Loss) Available to KKR & Co. Inc. Common Stockholders - Diluted		$ 1,056,502	$ 241,213	$ 457,448	$ 1,456,584
Weighted Average KKR Holdings Units
Weighted Average KKR Holdings Units (in shares)		282,692,900	296,248,180	285,757,397	297,624,035
Common Stock
NET INCOME (LOSS) ATTRIBUTABLE TO KKR & CO. INC. PER SHARE OF COMMON STOCK
Net Income (Loss) Attributable to KKR & Co. Inc. Common Stockholders		$ 1,056,502	$ 241,213	$ 466,265	$ 1,456,584
Net Income (Loss) Available to KKR & Co. Inc. Common Stockholders - Basic		$ 1,047,685	$ 241,213	$ 457,448	$ 1,456,584
Basic Net Income (Loss) Per Share of Common Stock
Weighted Average Shares of Common Stock Outstanding - Basic (in shares)		562,425,576	546,336,936	560,124,947	541,631,675
Net Income (Loss) Attributable to KKR & Co. Inc. Per Share of Common Stock - Basic (in dollars per share)		$ 1.86	$ 0.44	$ 0.82	$ 2.69
Diluted Net Income (Loss) Per Share of Common Stock
Weighted Average Shares of Common Stock Outstanding - Basic (in shares)		562,425,576	546,336,936	560,124,947	541,631,675
Incremental Common Shares:
Assumed vesting of dilutive equity awards (in shares)		9,954,502	13,195,129	9,786,034	13,154,681
Weighted Average Shares of Common Stock Outstanding - Diluted (in shares)		589,116,387	559,532,065	569,910,981	554,786,356
Net Income (Loss) Attributable to KKR & Co. Inc. Per Share of Common Stock - Diluted (in dollars per share)		$ 1.79	$ 0.43	$ 0.80	$ 2.63
Common Stock | Market Condition Awards
Weighted Average KKR Holdings Units
Weighted Average KKR Holdings Units (in shares)		5,000,000	5,000,000	5,000,000.0	5,000,000
Series C Preferred Stock
NET INCOME (LOSS) ATTRIBUTABLE TO KKR & CO. INC. PER SHARE OF COMMON STOCK
Accumulated Series C Mandatory Convertible Preferred Dividend		$ 8,817	$ 0	$ 8,817	$ 0
Accumulated Series C Mandatory Convertible Preferred Dividend (if dilutive)		$ 8,800		$ 8,800
Incremental Common Shares:
Assumed conversion of MCPS (in shares)		16,736,309	0	0	0
Weighted Average KKR Holdings Units
Weighted Average KKR Holdings Units (in shares)				5,600,000
Consecutive trading days	20 days	20 days
Trading days prior to period end	21 days	21 days