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Long-Term Debt - Additional Information (Detail)
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 23, 2021
USD ($)
Sep. 22, 2021
USD ($)
Aug. 09, 2021
USD ($)
Mar. 31, 2021
USD ($)
Jan. 31, 2021
amendment
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Short-term Debt [Line Items]                  
Interest paid, net of amounts capitalized               $ 251,000,000 $ 234,000,000
Loss on extinguishment of debt           $ 164,000,000 $ 0 164,000,000 $ 0
Maximum aggregate borrowings under credit facility (up to)           $ 4,500,000,000   $ 4,500,000,000  
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 EE Notes, interest rate of 5.8%, face amount of $600, maturing May 1, 2025 (effective interest rate of 6.0%) | Senior Notes                  
Short-term Debt [Line Items]                  
Debt redeemed $ 1,000,000,000                
Interest rate           5.75%   5.75%  
Aggregate principal amount           $ 600,000,000   $ 600,000,000  
Series II Notes, interest rate of 2.8%, face amount of $700, maturing October 15, 2033 (effective interest rate of 2.8%) | Senior Notes                  
Short-term Debt [Line Items]                  
Interest rate   2.75%       2.80%   2.80%  
Aggregate principal amount   $ 700,000,000       $ 700,000,000   $ 700,000,000  
Net proceeds   $ 693,000,000              
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]                  
Interest rate       2.85%   2.90%   2.90%  
Aggregate principal amount       $ 1,100,000,000   $ 1,100,000,000   $ 1,100,000,000  
Net proceeds       $ 1,089,000,000.000          
Series N Notes, interest rate of 3.1%, face amount of $400, redeemed August 9, 2021 (effective interest rate of 3.4%)                  
Short-term Debt [Line Items]                  
Debt redeemed     $ 400,000,000            
Series N Notes, interest rate of 3.1%, face amount of $400, redeemed August 9, 2021 (effective interest rate of 3.4%) | Senior Notes                  
Short-term Debt [Line Items]                  
Interest rate           3.10%   3.10%  
Aggregate principal amount           $ 400,000,000   $ 400,000,000