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LONG-TERM DEBT - Additional Information (Details)
1 Months Ended 12 Months Ended
Jan. 31, 2021
amendment
Aug. 31, 2020
USD ($)
Jul. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Apr. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2020
Debt Instrument [Line Items]                  
Maximum aggregate borrowings under credit facility (up to)           $ 4,500,000,000      
Outstanding borrowings           900,000,000 $ 0    
Cash paid for interest, net of amounts capitalized           377,000,000 $ 348,000,000 $ 290,000,000  
Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Borrowings under credit agreement           4,500,000,000      
Repayments under credit agreement           3,600,000,000      
Outstanding borrowings           900,000,000      
Senior Notes                  
Debt Instrument [Line Items]                  
Debt retired       $ 853,000,000          
Senior Notes | Series EE Notes, interest rate of 5.8%, face amount of $1,600, maturing May 1, 2025 (effective interest rate of 6.0%)                  
Debt Instrument [Line Items]                  
Face amount         $ 1,600,000,000 $ 1,600,000,000      
Interest rate         5.75% 5.80%      
Net proceeds         $ 1,581,000,000        
Senior Notes | Series FF Notes, interest rate of 4.6%, face amount of $1,000, maturing June 15, 2030 (effective interest rate of 4.8%)                  
Debt Instrument [Line Items]                  
Face amount       $ 1,000,000,000.0   $ 1,000,000,000      
Interest rate       4.625%   4.60%      
Net proceeds       $ 985,000,000          
Senior Notes | Series Q Notes, interest rate of 2.3%, face amount of $399, maturing January 15, 2022 (effective interest rate of 2.5%)                  
Debt Instrument [Line Items]                  
Debt retired       351,000,000          
Face amount           $ 399,000,000      
Interest rate           2.30%     2.30%
Senior Notes | Series L Notes, interest rate of 3.3%, face amount of $173, maturing September 15, 2022 (effective interest rate of 3.4%)                  
Debt Instrument [Line Items]                  
Debt retired       176,000,000          
Face amount           $ 173,000,000      
Interest rate           3.30%     3.30%
Senior Notes | Series DD Notes, interest rate of 2.1%, face amount of $224, maturing October 3, 2022 (effective interest rate of 1.2%)                  
Debt Instrument [Line Items]                  
Debt retired       $ 326,000,000          
Face amount           $ 224,000,000      
Interest rate           2.10%     2.10%
Senior Notes | Series M Notes, interest rate of 3.4%, face amount of $350, matured October 15, 2020 (effective interest rate of 3.6%)                  
Debt Instrument [Line Items]                  
Debt retired     $ 350,000,000            
Face amount           $ 350,000,000      
Interest rate           3.40%      
Senior Notes | Series GG Notes, interest rate of 3.5%, face amount of $1,000, maturing October 15, 2032 (effective interest rate of 3.7%)                  
Debt Instrument [Line Items]                  
Face amount   $ 1,000,000,000.0       $ 1,000,000,000      
Interest rate   3.50%       3.50%      
Net proceeds   $ 984,000,000              
Line of Credit | Revolving Credit Facility | Subsequent Event                  
Debt Instrument [Line Items]                  
Number of amendments | amendment 2                
Line of Credit | Revolving Credit Facility | Subsequent Event | Maximum                  
Debt Instrument [Line Items]                  
Maximum leverage ratio 5.50                
Line of Credit | Revolving Credit Facility | Subsequent Event | Minimum                  
Debt Instrument [Line Items]                  
Maximum leverage ratio 4.00