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Long-term Debt and Borrowing Facilities - Repurchase of Notes (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2021
Apr. 30, 2021
Oct. 31, 2020
Oct. 30, 2021
Oct. 30, 2021
Oct. 31, 2020
Sep. 30, 2021
Repayment of debt [1]         $ 1,716 $ 1,307  
Gain (loss) on repurchase of debt instrument     $ (53)   $ (195) [1] (53) [1]  
Gain (loss) on extinguishment of debt, net of tax     40        
2022 Notes, 2023 Notes, and 2037 Notes              
Debt instrument, repurchase amount     844     844  
Fixed Rate 7.60% Notes Due July 2037              
Debt instrument, repurchased face amount     53     53  
With Subsidiary Guarantee              
Gain (loss) on repurchase of debt instrument       $ (89)      
Gain (loss) on extinguishment of debt, net of tax       $ 68      
With Subsidiary Guarantee | 2023 Notes and 2025 Notes              
Debt instrument, repurchase amount             $ 532
With Subsidiary Guarantee | 2023 Notes              
Debt instrument, repurchased face amount     180     180 270
Debt instrument, redeemed amount $ 50            
Repayment of debt $ 54            
Fixed interest rate       5.625% 5.625%    
With Subsidiary Guarantee | 2025 Notes              
Debt instrument, repurchased face amount             $ 180
Fixed interest rate       9.375% 9.375%    
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   285 576     $ 576  
Fixed interest rate       5.625% 5.625%    
With Subsidiary Guarantee | 6.875% Fixed Interest Rate Secured Notes due July 2025              
Debt instrument, repurchased face amount   $ 750          
Fixed interest rate       6.875% 6.875%    
With Subsidiary Guarantee | Fixed Rate 6.625% Notes Due April 2021              
Debt instrument, redeemed amount     450        
Repayment of debt     $ 463        
Fixed interest rate       6.625% 6.625%    
[1] The cash flows related to discontinued operations have not been segregated. Accordingly, the Consolidated Statements of Cash Flows include the results of continuing and discontinued operations.