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Long-Term Debt Long Term Debt - 2020 Senior Notes (Details) - USD ($)
1 Months Ended
Oct. 05, 2020
Apr. 07, 2020
Nov. 30, 2020
Oct. 27, 2020
Oct. 20, 2020
Oct. 14, 2020
Sep. 30, 2020
Dec. 31, 2019
Aug. 28, 2017
May 17, 2017
2017 5.00% Senior Notes (due October 15, 2025)                    
Debt Instrument [Line Items]                    
Stated interest rate (as a percent)             5.00%   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%     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%                
Aggregate principal amount of debt issued   $ 500,000,000                
Period principal payments due   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%                  
Aggregate principal amount of debt issued $ 1,400,000,000                  
Period principal payments due $ 0                  
Senior Notes | November 2020 4.00% Senior Notes | Subsequent Event                    
Debt Instrument [Line Items]                    
Stated interest rate (as a percent)           4.00%        
Aggregate principal amount of debt issued           $ 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%          
Aggregate principal amount of debt issued         $ 750,000,000