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Long-Term Debt - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Jul. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Jan. 31, 2019
5.625% Senior Notes Due 2028 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount     $ 1,000 $ 500
Debt instrument, stated interest       5.625%
5.875% Senior Notes Due 2029 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount     $ 2,000 $ 1,000
Debt instrument, stated interest       5.875%
4.25% Senior Notes Due 2019 [Member] | Subsequent Event [Member]        
Debt Instrument [Line Items]        
Early Repayment of Senior Debt $ 600      
Debt Instrument, Redemption Price, Percentage 4.25%      
6.50% Senior Notes Due 2020 [Member] | Subsequent Event [Member]        
Debt Instrument [Line Items]        
Early Repayment of Senior Debt $ 3,000      
Debt Instrument, Redemption Price, Percentage 6.50%      
5.875% Senior Notes Due 2022 [Member] | Subsequent Event [Member]        
Debt Instrument [Line Items]        
Early Repayment of Senior Debt $ 1,350      
Debt Instrument, Redemption Price, Percentage 5.875%      
Secured Debt [Member] | Subsequent Event [Member]        
Debt Instrument [Line Items]        
Pretax loss on retirement of debt   $ 211    
4.13% Senior Notes Due 2029 [Member]        
Debt Instrument [Line Items]        
Debt instrument, stated interest     4.13%  
5.13% Senior Notes Due 2039 [Member]        
Debt Instrument [Line Items]        
Debt instrument, stated interest     5.13%  
5.25% Senior Notes Due 2049 [Member]        
Debt Instrument [Line Items]        
Debt instrument, stated interest     5.25%  
Senior Unsecured Notes [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount     $ 5,000 $ 1,500