v3.21.2
Debt - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Aug. 20, 2021
Aug. 02, 2021
May 13, 2021
Mar. 23, 2021
Jan. 14, 2021
Oct. 30, 2020
Apr. 06, 2020
Debt Instrument [Line Items]                      
Effective interest rate 4.10% 4.90% 4.20% 4.70%              
Average debt outstanding during period $ 75,500,000,000 $ 66,100,000,000 $ 74,500,000,000 $ 48,500,000,000              
Principal amount $ 660,000,000   660,000,000                
Call penalties     0                
Write off of premiums, discounts and issuance costs     $ 0                
Senior Notes                      
Debt Instrument [Line Items]                      
Principal outstanding               $ 3,800,000,000 $ 3,000,000,000.0   $ 19,000,000,000.0
Senior Secured Term Loan Commitment                      
Debt Instrument [Line Items]                      
Principal outstanding                   $ 5,000,000,000.0  
Total outstanding obligation                 2,000,000,000.0    
2.250% Senior Notes due 2026                      
Debt Instrument [Line Items]                      
Principal outstanding                 $ 1,000,000,000    
Interest rate, stated percentage                 2.25%    
2.625% Senior Notes due 2029                      
Debt Instrument [Line Items]                      
Principal outstanding                 $ 1,000,000,000    
Interest rate, stated percentage                 2.625%    
2.875% Senior Notes due 2031                      
Debt Instrument [Line Items]                      
Principal outstanding                 $ 1,000,000,000.0    
Interest rate, stated percentage                 2.875%    
2.625% Senior Notes Due 2026                      
Debt Instrument [Line Items]                      
Principal outstanding               $ 1,200,000,000      
Interest rate, stated percentage               2.625%      
3.375% Senior Notes due 2029                      
Debt Instrument [Line Items]                      
Principal outstanding               $ 1,250,000,000      
Interest rate, stated percentage               3.375%      
3.500% Senior Notes due 2031                      
Debt Instrument [Line Items]                      
Principal outstanding               $ 1,350,000,000      
Interest rate, stated percentage               3.50%      
6.500% Senior Notes due 2026 | Senior Notes                      
Debt Instrument [Line Items]                      
Interest rate, stated percentage 6.50%   6.50%                
Principal amount $ 2,000,000,000.0   $ 2,000,000,000.0                
Redemption price, (as a percent)     103.25%                
Call penalties     $ 65,000,000                
Write off of premiums, discounts and issuance costs     $ 36,000,000                
6.000% Senior Notes due 2023 | Senior Notes                      
Debt Instrument [Line Items]                      
Interest rate, stated percentage 6.00%   6.00%                
Principal amount $ 1,300,000,000   $ 1,300,000,000                
Redemption price, (as a percent)     100.00%                
Call penalties     $ 0                
Write off of premiums, discounts and issuance costs     $ 10,000,000                
6.000% Senior Notes due 2024 | Senior Notes                      
Debt Instrument [Line Items]                      
Interest rate, stated percentage 6.00%   6.00%                
Principal amount $ 1,000,000,000   $ 1,000,000,000                
Redemption price, (as a percent)     100.00%                
Call penalties     $ 0                
Write off of premiums, discounts and issuance costs     $ 9,000,000                
5.125% Senior Notes due 2025 | Senior Notes                      
Debt Instrument [Line Items]                      
Interest rate, stated percentage 5.125%   5.125%                
Principal amount $ 500,000,000   $ 500,000,000                
Redemption price, (as a percent)     101.281%                
Call penalties     $ 6,000,000                
Write off of premiums, discounts and issuance costs     $ 3,000,000                
2.250% Senior Notes due 2026, Issued May 13 2021                      
Debt Instrument [Line Items]                      
Principal outstanding             $ 800,000,000        
Interest rate, stated percentage             2.25%        
3.375% Senior Notes due 2029, Issued May 13 2021                      
Debt Instrument [Line Items]                      
Principal outstanding             $ 1,100,000,000        
Interest rate, stated percentage             3.375%        
3.500% Senior Notes due 2031, Issued May 13 2021                      
Debt Instrument [Line Items]                      
Principal outstanding             $ 1,100,000,000        
Interest rate, stated percentage             3.50%        
3.360% Secured Series 2016-1 A-1 Notes due 2021 | Senior Notes                      
Debt Instrument [Line Items]                      
Interest rate, stated percentage 3.36%   3.36%                
Principal amount $ 438,000,000   $ 438,000,000                
Call penalties     0                
Write off of premiums, discounts and issuance costs     $ 0                
3.360% Secured Series 2016-1 A-1 Notes due 2021 | Senior Notes | Subsequent Event                      
Debt Instrument [Line Items]                      
Interest rate, stated percentage           3.36%          
Principal amount         $ 220,000,000