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DEBT - Revolving Credit Facility (Details) - USD ($)
1 Months Ended 6 Months Ended
Aug. 31, 2019
Jun. 30, 2015
Jun. 30, 2019
Dec. 31, 2020
Oct. 31, 2020
Apr. 30, 2020
Dec. 31, 2019
Revolving Credit Facility              
Debt Instrument [Line Items]              
Revolving credit facility maximum borrowing capacity $ 2,000,000,000.0 $ 2,000,000,000.0          
Term of revolving credit facility 5 years 5 years          
Line of credit, outstanding       $ 0     $ 0
Proceeds from borrowings under credit facility     $ 400,000,000        
Repayments of borrowings under credit facility     $ 400,000,000        
Weighted-average interest rate     3.50%        
Debt instrument, minimum liquidity covenant, amount           $ 4,500,000,000  
Debt instrument, covenant, required minimum liquidity on a pro forma basis required for cash distribution and share repurchases         $ 6,000,000,000.0    
Revolving Credit Facility | Minimum              
Debt Instrument [Line Items]              
Revolving credit facility commitment fee percentage on undrawn balances 0.07%            
Revolving Credit Facility | Maximum              
Debt Instrument [Line Items]              
Revolving credit facility commitment fee percentage on undrawn balances 0.20%            
Revolving Credit Facility | Rate 1 | London Interbank Offered Rate (LIBOR) | Minimum              
Debt Instrument [Line Items]              
Reference rate 0.00%            
Revolving credit facility interest rate 0.875%            
Revolving Credit Facility | Rate 1 | London Interbank Offered Rate (LIBOR) | Maximum              
Debt Instrument [Line Items]              
Revolving credit facility interest rate 1.50%            
Revolving Credit Facility | Rate 2B | U. S. Federal Funds Rate              
Debt Instrument [Line Items]              
Revolving credit facility interest rate 0.50%            
Revolving Credit Facility | Rate 2C | Minimum              
Debt Instrument [Line Items]              
Revolving credit facility interest rate 0.00%            
Revolving Credit Facility | Rate 2C | Maximum              
Debt Instrument [Line Items]              
Revolving credit facility interest rate 0.50%            
Revolving Credit Facility | Rate 2C | One Month LIBOR              
Debt Instrument [Line Items]              
Revolving credit facility interest rate 1.00%            
Revolving Credit Facility | Rate 2C | One Month LIBOR | Minimum              
Debt Instrument [Line Items]              
Reference rate 0.00%            
Letter of Credit              
Debt Instrument [Line Items]              
Revolving credit facility maximum borrowing capacity $ 80,000,000            
Letters of credit outstanding       $ 4,000,000     $ 5,000,000
Swingline Loans              
Debt Instrument [Line Items]              
Revolving credit facility maximum borrowing capacity $ 100,000,000