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Pension, Postretirement Health Care and Other Benefits (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 09, 2015
Aug. 01, 2015
Aug. 02, 2014
Aug. 01, 2015
Aug. 02, 2014
Jan. 30, 2016
Pension Benefits            
Net Pension and Postretirement Health Care Benefits Expense            
Service cost   $ 27 $ 28 $ 55 $ 56  
Interest cost   39 37 77 75  
Expected return on assets   (65) (59) (130) (117)  
Amortization of losses   19 17 42 33  
Amortization of prior service cost   (3) (3) (6) (6)  
Settlement charges   0 0 2 0  
Total   17 20 40 41  
Remeasurement reduction to projected benefit obligation $ 208          
Remeasurement reduction to plan assets $ 47          
Increase in discount rate used 0.41%          
Plan assets   3,725   3,725    
Projected benefit obligation   3,604   3,604    
Reduction to pension expense   8   11    
Pension Benefits | Scenario, Forecast            
Net Pension and Postretirement Health Care Benefits Expense            
Reduction to pension expense           $ 26
Postretirement Health Care Benefits            
Net Pension and Postretirement Health Care Benefits Expense            
Service cost   1 1 2 2  
Interest cost   1 0 1 1  
Expected return on assets   0 0 0 0  
Amortization of losses   1 2 2 3  
Amortization of prior service cost   (5) (4) (9) (8)  
Settlement charges   0 0 0 0  
Total   $ (2) $ (1) $ (4) $ (2)