EQUITY - Noncontrolling Interests Held by KKR Holdings (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Noncontrolling Interests Held by KKR Holdings
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Net income (loss) attributable to noncontrolling interests	$ 691,730	$ 175,231	$ 301,946	$ 1,017,827
Noncontrolling Interests
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balance at the beginning of the period	19,439,794	18,406,585	19,694,884	15,610,358
Net income (loss) attributable to noncontrolling interests	1,909,458	87,058	206,225	1,843,781
Other comprehensive income (loss), net of tax	9,242	(10,358)	(4,804)	(9,611)
Exchange of KKR Holdings Units to Common Stock	(140,794)	(22,237)	(221,548)	(59,014)
Equity-based and other non-cash compensation	21,802	22,539	63,596	68,460
Capital contributions	3,486,377	713,189	5,796,680	3,364,097
Capital distributions	(2,617,289)	(729,333)	(3,412,058)	(2,350,628)
Transfer of interests under common control			(14,385)
Transfer of Oil and Gas Interests (See Note 2)	(23,358)		(23,358)
Changes in consolidation	(239,258)		(239,258)
Balance at the end of the period	21,845,974	18,467,443	21,845,974	18,467,443
Noncontrolling Interests | Noncontrolling Interests in Consolidated Entities
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balance at the beginning of the period	14,217,950	13,050,893	13,966,250	10,984,910
Net income (loss) attributable to noncontrolling interests	1,217,728	(88,173)	(95,721)	825,954
Other comprehensive income (loss), net of tax	2,121	(3,877)	(5,053)	(2,966)
Exchange of KKR Holdings Units to Common Stock	0	0	0	0
Equity-based and other non-cash compensation	0	0	0	0
Capital contributions	3,486,352	713,166	5,796,607	3,362,478
Capital distributions	(2,531,637)	(692,224)	(3,247,739)	(2,190,591)
Transfer of interests under common control			(21,830)
Transfer of Oil and Gas Interests (See Note 2)	0		0
Changes in consolidation	(239,258)		(239,258)
Balance at the end of the period	16,153,256	12,979,785	16,153,256	12,979,785
Noncontrolling Interests | Noncontrolling Interests Held by KKR Holdings
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balance at the beginning of the period	5,221,844	5,355,692	5,728,634	4,625,448
Net income (loss) attributable to noncontrolling interests	691,730	175,231	301,946	1,017,827
Other comprehensive income (loss), net of tax	7,121	(6,481)	249	(6,645)
Exchange of KKR Holdings Units to Common Stock	(140,794)	(22,237)	(221,548)	(59,014)
Equity-based and other non-cash compensation	21,802	22,539	63,596	68,460
Capital contributions	25	23	73	1,619
Capital distributions	(85,652)	(37,109)	(164,319)	(160,037)
Transfer of interests under common control			7,445
Transfer of Oil and Gas Interests (See Note 2)	(23,358)		(23,358)
Changes in consolidation	0		0
Balance at the end of the period	$ 5,692,718	$ 5,487,658	$ 5,692,718	$ 5,487,658