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Long-term Debt and Borrowing Facilities - Repurchase of Notes (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2021
Oct. 30, 2021
Jul. 31, 2021
Aug. 01, 2020
Sep. 03, 2021
Sep. 02, 2021
Gain (loss) on repurchase of debt instrument     $ (105) $ 0    
With Subsidiary Guarantee | 2022 Notes and 2025 Secured Notes            
Gain (loss) on repurchase of debt instrument $ (105)          
Gain (loss) on extinguishment of debt, net of tax (80)          
With Subsidiary Guarantee | Fixed Rate 5.625% Notes Due February 2022            
Debt instrument, repurchased face amount 285          
With Subsidiary Guarantee | 6.875% Fixed Interest Rate Secured Notes due July 2025            
Debt instrument, repurchased face amount $ 750          
With Subsidiary Guarantee | 2023 Notes, 2025 Notes and 2027 Notes | Subsequent Event | Maximum            
Debt instrument, repurchased face amount           $ 500
With Subsidiary Guarantee | 2023 Notes and 2025 Notes | Subsequent Event | Forecast            
Gain (loss) on repurchase of debt instrument   $ (84)        
Debt instrument, repurchase amount         $ 532  
With Subsidiary Guarantee | 2023 Notes | Subsequent Event | Forecast            
Debt instrument, repurchased face amount         270  
With Subsidiary Guarantee | 2025 Notes | Subsequent Event | Forecast            
Debt instrument, repurchased face amount         $ 180  
With Subsidiary Guarantee | 2025 Notes and 2027 Notes | Subsequent Event | Maximum            
Debt instrument, repurchased face amount           $ 180