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Long-Term Debt Long-Term Debt - 2020 Senior Notes (Details) - USD ($)
1 Months Ended
Oct. 16, 2020
Oct. 05, 2020
Apr. 07, 2020
Nov. 30, 2020
Oct. 27, 2020
Oct. 20, 2020
Oct. 14, 2020
Sep. 30, 2020
Dec. 31, 2019
2017 5.00% Senior Notes (due October 15, 2025)                  
Debt Instrument [Line Items]                  
Stated interest rate (as a percent)               5.00%  
Senior notes               $ 2,800,000,000 $ 2,800,000,000
2017 5.00% Senior Notes (due October 15, 2025) | Forecast                  
Debt Instrument [Line Items]                  
Principal amount redeemed       $ 1,450,000,000          
2017 5.00% Senior Notes (due October 15, 2025) | Subsequent Event                  
Debt Instrument [Line Items]                  
Principal amount redeemed $ 1,350,000,000                
2017 4.25% Senior Notes (due May 15, 2024)                  
Debt Instrument [Line Items]                  
Stated interest rate (as a percent)               4.25%  
Senior notes               $ 1,500,000,000 $ 1,500,000,000
2017 4.25% Senior Notes (due May 15, 2024) | Forecast                  
Debt Instrument [Line Items]                  
Principal amount redeemed         $ 725,000,000        
Senior Notes | 2020 5.75% Senior Notes (Due April 15, 2025)                  
Debt Instrument [Line Items]                  
Stated interest rate (as a percent)     5.75%            
Debt instrument, face amount     $ 500,000,000            
Principal payments     0            
Capitalized debt issuance costs     $ 9,000,000            
Senior Notes | 2020 4.00% Senior Notes (Due October 15, 2030) | Subsequent Event                  
Debt Instrument [Line Items]                  
Stated interest rate (as a percent)   4.00%              
Debt instrument, face amount   $ 1,400,000,000              
Principal payments   $ 0              
Senior Notes | November 2020 4.00% Senior Notes | Subsequent Event                  
Debt Instrument [Line Items]                  
Stated interest rate (as a percent)             4.00%    
Debt instrument, face amount             $ 1,500,000,000    
Senior Notes | 3.50% Senior Notes (Due February 15, 2029) | Subsequent Event                  
Debt Instrument [Line Items]                  
Stated interest rate (as a percent)           3.50%      
Debt instrument, face amount           $ 750,000,000