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Long-term Debt and Borrowing Facilities (Issuance And Repurchase Of Notes) (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 12, 2021
Oct. 30, 2020
Sep. 30, 2020
Jun. 30, 2020
Jul. 31, 2019
Jun. 30, 2019
Oct. 31, 2020
Aug. 03, 2019
Jan. 30, 2021
Feb. 01, 2020
Feb. 02, 2019
Interest Paid, Including Capitalized Interest, Operating and Investing Activities                 $ 418,000,000 $ 363,000,000 $ 380,000,000
Extinguishment of Debt, Amount                 1,259,000,000    
Repayments of Long-term Debt   $ 844,000,000     $ 130,000,000 $ 669,000,000     1,307,000,000 799,000,000 52,000,000
Gain (Loss) on Extinguishment of Debt             $ (53,000,000) $ 40,000,000 $ (53,000,000) $ (40,000,000) $ 0
Extinguishment of Debt, Gain (Loss), Net of Tax             $ (40,000,000) $ 30,000,000      
Fixed Rate 6.625% Notes Due April 2021 [Member]                      
Repayments of Long-term Debt   463,000,000                  
With Subsidiary Guarantee | Subsequent Event                      
Repayments of debt $ 1,100,000,000                    
With Subsidiary Guarantee | Fixed Rate 6.625% Notes Due October 2030                      
Debt Instrument, Face Amount     $ 1,000,000,000                
Debt Instrument, Interest Rate, Stated Percentage     6.625%                
Proceeds from Issuance of Debt     $ 988,000,000                
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net     $ 12,000,000                
With Subsidiary Guarantee | 6.875% Fixed Interest Rate Secured Notes due July 2025                      
Debt Instrument, Face Amount       $ 750,000,000              
Debt Instrument, Interest Rate, Stated Percentage       6.875%              
Proceeds from Issuance of Debt       $ 738,000,000              
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net       12,000,000              
With Subsidiary Guarantee | 6.875% Fixed Interest Rate Secured Notes due July 2025 | Subsequent Event                      
Extinguishment of Debt, Amount 750,000,000                    
With Subsidiary Guarantee | 9.375% Fixed Interest Rate Notes due July 2025                      
Debt Instrument, Face Amount       $ 500,000,000              
Debt Instrument, Interest Rate, Stated Percentage       9.375%              
Proceeds from Issuance of Debt       $ 492,000,000              
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net       $ 8,000,000              
With Subsidiary Guarantee | Fixed Rate 7.5% Notes Due June 2029 [Member]                      
Debt Instrument, Face Amount           $ 500,000,000          
Debt Instrument, Interest Rate, Stated Percentage           7.50%          
Proceeds from Issuance of Debt           $ 486,000,000          
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net           14,000,000          
With Subsidiary Guarantee | Fixed Rate 5.625% Notes Due February 2022 [Member]                      
Extinguishment of Debt, Amount   576,000,000       96,000,000          
With Subsidiary Guarantee | Fixed Rate 5.625% Notes Due February 2022 [Member] | Subsequent Event                      
Extinguishment of Debt, Amount $ 285,000,000                    
With Subsidiary Guarantee | Fixed Rate 5.625% Notes Due October 2023 [Member]                      
Extinguishment of Debt, Amount   180,000,000                  
With Subsidiary Guarantee | Fixed Rate 6.625% Notes Due April 2021 [Member]                      
Extinguishment of Debt, Amount   450,000,000       330,000,000          
With Subsidiary Guarantee | Fixed Rate 7.00% Notes Due May 2020 [Member]                      
Extinguishment of Debt, Amount         $ 126,000,000 $ 212,000,000          
Without Subsidiary Guarantee [Member] | Fixed Rate 7.60% Notes Due July 2037 [Member]                      
Extinguishment of Debt, Amount   $ 53,000,000