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Long-Term Debt - Additional Information (Detail)
1 Months Ended 3 Months Ended
Mar. 31, 2021
USD ($)
Jan. 31, 2021
amendment
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Debt Disclosure [Abstract]          
Interest paid, net of amounts capitalized     $ 38,000,000 $ 63,000,000  
Maximum aggregate borrowings under credit facility (up to) $ 4,500,000,000   4,500,000,000    
Proceeds from credit facility     600,000,000    
Repayments of credit facility     1,100,000,000    
Outstanding under credit facility 400,000,000   400,000,000   $ 900,000,000
Line of Credit | Revolving Credit Facility          
Short-term Debt [Line Items]          
Number of amendments | amendment   2      
Line of Credit | Revolving Credit Facility | Maximum          
Short-term Debt [Line Items]          
Maximum leverage ratio   5.50      
Line of Credit | Revolving Credit Facility | Minimum          
Short-term Debt [Line Items]          
Maximum leverage ratio   4.00      
Series HH Notes, interest rate of 2.9%, face amount of $1,100, maturing April 15, 2031 (effective interest rate of 3.0%) | Senior Notes          
Short-term Debt [Line Items]          
Aggregate principal amount $ 1,100,000,000   $ 1,100,000,000    
Interest rate 2.85%   2.85%    
Net proceeds $ 1,089,000,000.000