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DEBT - Credit Agreement (Details)
6 Months Ended
Jun. 30, 2017
USD ($)
May 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Line of Credit Facility [Line Items]      
Actual net worth $ 10,953,000,000   $ 10,685,000,000
Credit Agreement | Line of Credit | Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Term 5 years    
Maximum borrowing capacity $ 2,500,000,000 $ 1,000,000,000.0  
Minimum level of net worth required 8,900,000,000    
Actual net worth $ 11,000,000,000    
Required maximum leverage ratio 3.0    
Actual leverage ratio 1.1    
Uncommitted incremental loan facility $ 500,000,000    
Line of credit, outstanding borrowings 0    
Credit Agreement | Line of Credit | Letter of Credit      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity $ 0    
Credit Agreement | London Interbank Offered Rate (LIBOR) | Line of Credit | Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Interest rate spread 110.00%    
Facility fee (percentage) 15.00%    
Credit Agreement | Minimum | London Interbank Offered Rate (LIBOR) | Line of Credit | Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Interest rate spread 90.00%    
Facility fee (percentage) 10.00%    
Credit Agreement | Maximum | London Interbank Offered Rate (LIBOR) | Line of Credit | Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Interest rate spread 150.00%    
Facility fee (percentage) 25.00%    
Unsecured Revolving Credit Agreement, Expires May 2022 [Member] | Line of Credit | Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Term 5 years    
Maximum borrowing capacity $ 2,000,000,000