CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (UNAUDITED) - USD ($) $ in Thousands		Total		Preferred Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Class A Common Stock Common Units	Class B Common Stock Common Units	Class C Common Stock Common Units	Common Units	Capital - Common Unitholders	Accumulated Other Comprehensive Income (Loss)	Total Capital - Common Units	Series A Preferred Units/Preferred Stock	Series B Preferred Units/Preferred Stock	Noncontrolling Interests	Preferred Stock
KKR & Co. L.P. Partners' Capital - beginning balance at Dec. 31, 2016		$ 16,485,735										$ 5,506,375	$ (49,096)	$ 5,457,279	$ 332,988	$ 149,566	$ 10,545,902
Balance (in units) at Dec. 31, 2016											452,380,335
Increase (Decrease) in Partners' Capital
Net Income (Loss)		1,981,160										818,552		818,552	17,466	7,557	1,137,585
Other Comprehensive Income (Loss)- Foreign Currency Translation (Net of Tax)		47,097											23,031	23,031			24,066
Changes in Consolidation		(71,657)															(71,657)
Transfer of interests under common control (See Note 15 Equity)												12,269	(1,988)	10,281			(10,281)
Exchange of KKR Holdings L.P. Units and Other Securities to KKR & Co. L.P. Common Units												198,970	(1,615)	197,355			(197,355)
Exchange of KKR Holdings L.P. Units and Other Securities to KKR & Co. L.P. Common Units (in units)											14,524,298
Tax Effects Resulting from Exchange of KKR Holdings L.P. Units and Other		(7,595)										(8,093)	498	(7,595)
Net Delivery of Common Units - Equity Incentive Plan		(37,304)										(37,304)		(37,304)
Net Delivery of Common Units - Equity Incentive Plan (in units)											6,229,754
Equity-Based and Other Non-Cash Compensation		277,704										149,840		149,840			127,864
Capital Contributions		2,486,848															2,486,848
Capital Distributions		(1,866,688)										(230,785)		(230,785)	(17,466)	(7,557)	(1,610,880)
KKR & Co. L.P. Partners' Capital - ending balance at Sep. 30, 2017		19,295,300										6,409,824	(29,170)	6,380,654	332,988	149,566	12,432,092
Balance (in units) at Sep. 30, 2017											473,134,387
Balance at Dec. 31, 2016		632,348
Increase (Decrease) in Redeemable Noncontrolling Interests
Net Income (Loss)		64,196
Changes in consolidation		(315,057)
Capital Contributions		189,172
Capital distributions		(525)
Balance at Sep. 30, 2017		570,134
Increase (Decrease) in Stockholders' Equity
Net Income (Loss) Attributable to KKR & Co. Inc.		843,575
Noncontrolling Interests (See Note 15 Equity)	[1]	12,866,324
Total Equity	[1]	20,052,260
KKR & Co. L.P. Partners' Capital - beginning balance at Dec. 31, 2017		20,052,260										6,722,863	(19,481)	6,703,382	332,988	149,566	12,866,324
Balance (in units) at Dec. 31, 2017											486,174,736
Increase (Decrease) in Partners' Capital
Net Income (Loss)		2,161,632										850,483		850,483	11,644	5,038	1,294,467
Other Comprehensive Income (Loss)- Foreign Currency Translation (Net of Tax)		(23,913)											(9,237)	(9,237)			(14,676)
Changes in Consolidation		370,307															370,307
Exchange of KKR Holdings L.P. Units and Other Securities to KKR & Co. L.P. Common Units												507,470	(1,998)	505,472			(505,472)
Exchange of KKR Holdings L.P. Units and Other Securities to KKR & Co. L.P. Common Units (in units)											32,722,098
Tax Effects Resulting from Exchange of KKR Holdings L.P. Units and Other		6,465										6,448	17	6,465
Net Delivery of Common Units - Equity Incentive Plan		(53,439)										(53,439)		(53,439)
Net Delivery of Common Units - Equity Incentive Plan (in units)											7,652,340
Equity-Based and Other Non-Cash Compensation		187,936										125,994		125,994			61,942
Unit Repurchases		(52,212)										(52,212)		(52,212)
Unit Repurchases (in units)											(2,207,300)
Capital Contributions		2,410,722															2,410,722
Capital Distributions		(1,734,715)										(167,078)		(167,078)	(11,644)	(5,038)	(1,550,955)
KKR & Co. L.P. Partners' Capital - ending balance at Jun. 30, 2018		23,325,043										7,940,529	(30,699)	7,909,830	332,988	149,566	14,932,659
Balance (in units) at Jun. 30, 2018											524,341,874
Balance at Dec. 31, 2017		610,540
Increase (Decrease) in Redeemable Noncontrolling Interests
Net Income (Loss)		7,658
Capital Contributions		349,451
Capital distributions		(5,502)
Balance at Jun. 30, 2018		962,147
Stockholders' equity, beginning balance at Dec. 31, 2017	[1]	7,185,936
Stockholders' equity, ending balance at Jun. 30, 2018				$ 0	$ 0	$ 0	$ (30,699)	$ 0	$ 0	$ 0		$ 7,940,529						$ 482,554
Shares outstanding, ending balance (in shares) at Jun. 30, 2018				0				0	0	0		524,341,874						20,000,000
KKR & Co. L.P. Partners' Capital - beginning balance at Dec. 31, 2017		20,052,260										$ 6,722,863	(19,481)	6,703,382	332,988	149,566	12,866,324
Balance (in units) at Dec. 31, 2017											486,174,736
Increase (Decrease) in Partners' Capital
Other Comprehensive Income (Loss)- Foreign Currency Translation (Net of Tax)		(57,988)
Transfer of interests under common control (See Note 15 Equity)		(370,307)
Tax Effects Resulting from Exchange of KKR Holdings L.P. Units and Other		(629)
Capital Contributions		3,537,037
Capital Distributions		(2,191,227)
Balance at Dec. 31, 2017		610,540
Increase (Decrease) in Redeemable Noncontrolling Interests
Net Income (Loss)		19,894
Capital Contributions		450,330
Capital distributions		(10,189)
Balance at Sep. 30, 2018		1,070,575
Stockholders' equity, beginning balance at Dec. 31, 2017	[1]	7,185,936
Increase (Decrease) in Stockholders' Equity
Net Income (Loss) Attributable to KKR & Co. Inc.		1,515,704
Stockholders' equity, ending balance at Sep. 30, 2018		9,006,767	[1]	$ 482,554	8,005,338	551,036	(40,448)	$ 5,256	$ 0	$ 3,031		$ 0						$ 0
Shares outstanding, ending balance (in shares) at Sep. 30, 2018				20,000,000				525,593,409	1	303,106,993		0						0
KKR & Co. L.P. Partners' Capital - beginning balance at Jun. 30, 2018		23,325,043										$ 7,940,529	(30,699)	7,909,830	332,988	149,566	14,932,659
Balance (in units) at Jun. 30, 2018											524,341,874
Balance at Jun. 30, 2018		962,147
Stockholders' equity, beginning balance at Jun. 30, 2018				$ 0	0	0	(30,699)	$ 0	$ 0	$ 0		$ 7,940,529						$ 482,554
Shares outstanding, beginning balance (in shares) at Jun. 30, 2018				0				0	0	0		524,341,874						20,000,000
Increase (Decrease) in Stockholders' Equity
Reclassifications resulting from the Conversion					7,932,245			$ 5,243	$ 0	$ 3,041
Stockholders' equity, ending balance at Jul. 01, 2018												$ 0
KKR & Co. L.P. Partners' Capital - beginning balance at Jun. 30, 2018		23,325,043										7,940,529	$ (30,699)	$ 7,909,830	$ 332,988	$ 149,566	$ 14,932,659
Balance (in units) at Jun. 30, 2018											524,341,874
Increase (Decrease) in Partners' Capital
Other Comprehensive Income (Loss)- Foreign Currency Translation (Net of Tax)		(34,075)					(9,624)
Exchange of KKR Holdings L.P. Units and Other Securities to KKR & Co. L.P. Common Units					48,844		(145)	$ 25		$ (10)
Exchange of KKR Holdings L.P. Units and Other Securities to KKR & Co. L.P. Common Units (in units)								2,402,569		(1,000,769)
Tax Effects Resulting from Exchange of KKR Holdings L.P. Units and Other					(7,114)		20
Balance at Jun. 30, 2018		962,147
Increase (Decrease) in Redeemable Noncontrolling Interests
Net Income (Loss)		12,236
Balance at Sep. 30, 2018		1,070,575
Stockholders' equity, beginning balance at Jun. 30, 2018				$ 0	0	0	(30,699)	$ 0	$ 0	$ 0		$ 7,940,529						$ 482,554
Shares outstanding, beginning balance (in shares) at Jun. 30, 2018				0				0	0	0		524,341,874						20,000,000
Increase (Decrease) in Stockholders' Equity
Reclassifications resulting from the Conversion				$ 482,554	7,932,245			$ 5,243	$ 0	$ 3,041		$ (7,940,529)						$ (482,554)
Reclassifications resulting from Conversion (in shares)				20,000,000				524,341,874	1	304,107,762		(524,341,874)						(20,000,000)
Repurchases of Class A Common Stock					(28,438)			$ (12)
Repurchases of Class A Common Stock (in shares)								(1,151,034)
Equity-Based Compensation					59,801
Net Income (Loss) Attributable to KKR & Co. Inc.		648,539				648,539
Preferred Stock Dividends						(8,341)
Common Stock Dividends						(89,162)
Stockholders' equity, ending balance at Sep. 30, 2018		9,006,767	[1]	$ 482,554	$ 8,005,338	$ 551,036	$ (40,448)	$ 5,256	$ 0	$ 3,031		$ 0						$ 0
Shares outstanding, ending balance (in shares) at Sep. 30, 2018				20,000,000				525,593,409	1	303,106,993		0						0
Increase (Decrease) in Stockholders' Equity
Noncontrolling Interests (See Note 15 Equity)	[1]	16,062,569
Total Equity	[1]	$ 25,069,336

[1] See Note 1 "Organization."