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Indebtedness - Additional Information (Detail) - USD ($)
3 Months Ended
May 20, 2020
Mar. 25, 2020
Jun. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]        
Principal amount     $ 6,304,000,000 $ 5,603,000,000
3.75% 2020 Senior Notes, due 2025        
Debt Instrument [Line Items]        
Principal amount   $ 700,000,000 $ 700,000,000  
Debt instrument, term   5 years    
Notes payable, interest rate   3.75% 3.75%  
3.25% 2020 Senior Notes, due 2050        
Debt Instrument [Line Items]        
Principal amount $ 300,000,000   $ 300,000,000  
Debt instrument, term 30 years      
Notes payable, interest rate 3.25%   3.25%  
3.25% 2018 Senior Notes, due 2021        
Debt Instrument [Line Items]        
Principal amount       $ 300,000,000
Notes payable, interest rate     3.25% 3.25%
Repayments of debt     $ 300,000,000  
Make-Whole Amount     $ 8,000,000