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DEBT OBLIGATIONS - Narrative (Details)
9 Months Ended
Jun. 28, 2018
USD ($)
May 23, 2018
USD ($)
Feb. 12, 2018
USD ($)
Jun. 29, 2017
Sep. 30, 2018
USD ($)
Sep. 30, 2018
JPY (¥)
Mar. 23, 2018
JPY (¥)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]                
Borrowing Outstanding         $ 20,266,172,000     $ 21,193,859,000
Senior Notes                
Debt Instrument [Line Items]                
Aggregate principal amount | ¥             ¥ 40,300,000,000  
Minimum percentage of aggregate principal amount held to declare notes due and payable         25.00%      
Redemption price (as a percent of principal)         100.00%      
KCM Credit Agreement                
Debt Instrument [Line Items]                
Letters of credit outstanding         $ 48,300,000     12,300,000
KKR Issued 0.509% Notes Due 2023 | Senior Notes                
Debt Instrument [Line Items]                
Borrowing Outstanding         218,562,000     0
Aggregate principal amount         $ 219,906,000 ¥ 25,000,000,000 ¥ 25,000,000,000  
Interest rate, stated percentage         0.509% 0.509% 0.509%  
KKR Issued 0.764% Notes Due 2025 | Senior Notes                
Debt Instrument [Line Items]                
Borrowing Outstanding         $ 43,243,000     0
Aggregate principal amount         $ 43,981,000 ¥ 5,000,000,000 ¥ 5,000,000,000  
Interest rate, stated percentage         0.764% 0.764% 0.764%  
KKR Issued 1.595% Notes Due 2038 | Senior Notes                
Debt Instrument [Line Items]                
Borrowing Outstanding         $ 89,398,000     0
Aggregate principal amount         $ 90,601,000 ¥ 10,300,000,000.0 ¥ 10,300,000,000  
Interest rate, stated percentage         1.595% 1.595% 1.595%  
KFN Issued 5.200% Notes Due 2033 | Senior Notes | KFN                
Debt Instrument [Line Items]                
Borrowing Outstanding         $ 118,260,000     0
Aggregate principal amount     $ 120,000,000.0   $ 120,000,000      
Interest rate, stated percentage     5.20%   5.20% 5.20%    
Minimum percentage of aggregate principal amount held to declare notes due and payable         25.00%      
Redemption price (as a percent of principal)     100.00%   101.00%      
KFN Issued 5.400% Notes Due 2033 | Senior Notes | KFN                
Debt Instrument [Line Items]                
Borrowing Outstanding         $ 68,660,000     0
Aggregate principal amount   $ 70,000,000.0     $ 70,000,000      
Interest rate, stated percentage   5.40%     5.40% 5.40%    
Minimum percentage of aggregate principal amount held to declare notes due and payable         25.00%      
Redemption price (as a percent of principal)   100.00%     101.00%      
Revolving Credit Facility | Line of Credit                
Debt Instrument [Line Items]                
Debt instrument, term       364 days        
Revolving Credit Facility | KCM Credit Agreement                
Debt Instrument [Line Items]                
Borrowing Outstanding         $ 0     $ 0
Revolving Credit Facility | KCM Credit Agreement | Line of Credit                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity         $ 500,000,000      
Revolving Credit Facility | KCM Revolver Agreement | Line of Credit                
Debt Instrument [Line Items]                
Debt instrument, term 364 days              
Line of credit facility, maximum borrowing capacity $ 750,000,000              
Facility fee (as a percent)         0.20%      
Minimum | LIBOR | Revolving Credit Facility | KCM Revolver Agreement | Line of Credit                
Debt Instrument [Line Items]                
Basis spread on variable rate         1.25%      
Minimum | Base Rate | Revolving Credit Facility | KCM Revolver Agreement | Line of Credit                
Debt Instrument [Line Items]                
Basis spread on variable rate         0.25%      
Maximum | LIBOR | Revolving Credit Facility | KCM Revolver Agreement | Line of Credit                
Debt Instrument [Line Items]                
Basis spread on variable rate         2.50%      
Maximum | Base Rate | Revolving Credit Facility | KCM Revolver Agreement | Line of Credit                
Debt Instrument [Line Items]                
Basis spread on variable rate         1.50%