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Long-term Debt and Borrowing Facilities (Issuance And Repurchase Of Notes) (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 03, 2019
Jul. 06, 2019
Aug. 03, 2019
Aug. 03, 2019
Aug. 04, 2018
Feb. 02, 2019
Debt Instrument, Face Amount $ 5,458   $ 5,458 $ 5,458 $ 5,722 $ 5,722
Proceeds from Issuance of Long-Term Debt, Net of Issuance Costs       486 0  
Debt Instrument, Repurchase Amount   $ 669   799 52  
Gain (Loss) on Extinguishment of Debt     40 (40) $ 0  
Extinguishment of Debt, Gain (Loss), Net of Tax     30      
Fixed Rate 7.00% Notes Due May 2020 [Member]            
Debt Instrument, Repurchase Amount 130          
With Subsidiary Guarantee [Member] | Fixed Rate 5.625 Percent Notes Due February 2022 [Member]            
Extinguishment of Debt, Amount   96        
With Subsidiary Guarantee [Member] | Fixed Rate 7.5% Notes Due June 2029 [Member]            
Debt Instrument, Face Amount $ 500   $ 500 $ 500    
Debt instrument, stated rate 7.50%   7.50% 7.50%    
Proceeds from Issuance of Debt     $ 486      
Payments of Debt Issuance Costs $ 14   $ 14 $ 14    
With Subsidiary Guarantee [Member] | Fixed Rate 6.625 Percent Notes Due April 2021 [Member]            
Extinguishment of Debt, Amount   330        
With Subsidiary Guarantee [Member] | Fixed Rate 7.00% Notes Due May 2020 [Member]            
Extinguishment of Debt, Amount $ 126 $ 212