INCOME TAXES - Reconciliation of Effective Income Tax Rate to the U.S. Federal Statutory Tax Rate (Details)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Statutory U.S. Federal Income Tax Rate	21.00%	35.00%	35.00%
Income not attributable to KKR & Co. Inc.	(20.13%)	(38.64%)	(42.68%)
Foreign Income Taxes	1.66%	2.62%	4.32%
State and Local Income Taxes	(0.16%)	0.05%	0.05%
Compensation Charges Borne by KKR Holdings	1.69%	6.29%	8.20%
Conversion Benefit	(11.19%)	(0.00%)	(0.00%)
Change in Valuation Allowance	(0.53%)	0.00%	(1.03%)
Impact of 2017 Tax Act	0.00%	3.52%	0.00%
Other	(0.94%)	(0.78%)	(1.34%)
Effective Income Tax Rate	(8.60%)	8.06%	2.52%

Effective Income Tax Rate Reconciliation, C-Corp Conversion Benefit, Percent

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to compensation charges borne by affiliates.

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Effective Income Tax Rate Reconciliation, Tax Cuts And Jobs Act Of 2017, Percent

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for extraterritorial income exclusion.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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