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Financing (Narrative) (Details)
12 Months Ended
Aug. 15, 2016
USD ($)
Rate
Dec. 07, 2015
USD ($)
Aug. 17, 2015
USD ($)
Rate
Nov. 18, 2014
USD ($)
May 23, 2014
USD ($)
Jan. 28, 2017
USD ($)
Rate
Jan. 30, 2016
USD ($)
Jan. 31, 2015
USD ($)
May 06, 2016
USD ($)
Extinguishment of debt       $ 407,000,000          
Long-term debt           $ 6,438,000,000 $ 6,756,000,000    
Additional interest expense from early repurchase of debt           0 0 $ 17,000,000  
Amount of outstanding debt repaid at maturity           636,000,000 69,000,000 453,000,000  
Line of credit facility, maximum borrowing capacity                 $ 1,500,000,000
Line of credit facility, maximum borrowing capacity at Company's option                 $ 1,750,000,000
Letters of Credit Outstanding, Amount           $ 0 1,000,000    
Interest coverage ratio           7.36      
Leverage ratio           2.38      
Minimum specified interest coverage ratio in credit agreement           3.25      
Maximum specified leverage ratio in credit agreement           3.75      
Amount non-recurring cash charges may not exceed in credit agreement           $ 300,000,000      
Amount of indebtedness due prior to maturity that would result in default under credit agreements           150,000,000      
Cross Default Provision In Credit Agreement Floor           100,000,000      
Commercial paper           1,500,000,000      
commercial paper maximum borrowings           388,000,000      
Prepaid expenses and other current assets pledged as collateral for debt security           37,000,000 37,000,000    
8.125% Senior Debentures Due 2035 [Member]                  
Extinguishment of debt $ 108,000,000   $ 76,000,000     $ 0 76,000,000 0  
Debt instrument interest rate, stated percentage | Rate 7.875%   8.125%     8.125%      
7.875% Senior Notes Due 2015 [Member]                  
Debt instrument interest rate, stated percentage       7.875%          
Other Standby and Commercial Letters of Credit [Member]                  
Debt instrument, principal outstanding           $ 30,000,000 21,000,000    
3.45% senior notes due 2021 [Member]                  
Proceeds from Issuance of Debt   $ 500,000,000              
Debt instrument interest rate, stated percentage   3.45%       3.45%      
Debt instrument, principal outstanding           $ 500,000,000 500,000,000    
3.625% senior notes due 2024 [Member]                  
Proceeds from Issuance of Debt         $ 500,000,000        
Debt instrument interest rate, stated percentage         3.625% 3.625%      
Debt instrument, principal outstanding           $ 500,000,000 500,000,000    
7.875% Senior Notes Due 2015 [Member]                  
Extinguishment of debt           $ 108,000,000 0 $ 0  
Debt instrument interest rate, stated percentage | Rate           7.875%      
4.375% Senior notes due 2023 [Member]                  
Debt instrument interest rate, stated percentage | Rate           4.375%      
Debt instrument, principal outstanding           $ 400,000,000 400,000,000    
3.875% Senior notes due 2022 [Member]                  
Debt instrument interest rate, stated percentage | Rate           3.875%      
Debt instrument, principal outstanding           $ 550,000,000 550,000,000    
5.125% Senior debentures due 2042 [Member]                  
Debt instrument interest rate, stated percentage | Rate           5.125%      
Debt instrument, principal outstanding           $ 250,000,000 250,000,000    
2.875% Senior notes due 2023 [Member]                  
Debt instrument interest rate, stated percentage | Rate           2.875%      
Debt instrument, principal outstanding           $ 750,000,000 750,000,000    
4.3% Senior notes due 2043 [Member]                  
Debt instrument interest rate, stated percentage | Rate           4.30%      
Debt instrument, principal outstanding           $ 250,000,000 250,000,000    
4.5% senior notes due 2034[Member]                  
Proceeds from Issuance of Debt       $ 550,000,000          
Debt instrument interest rate, stated percentage       4.50%   4.50%      
Debt instrument, principal outstanding           $ 550,000,000 550,000,000    
Carrying Amount                  
Long-term debt           6,535,000,000 6,966,000,000    
Revolving Credit Facility [Member]                  
Long-term Line of Credit           $ 0 $ 0