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Pension and Postretirement Health Care Plans - Narrative (Details) - USD ($)
12 Months Ended
Jan. 30, 2016
Jan. 31, 2015
Defined Benefit Plan Disclosure [Line Items]    
Future salary growth $ 0 $ 0
Adjustments (as a percent) 20.00%  
Adjustment period 5 years  
Allocation to real estate (as a percent) 100.00% 100.00%
Equity Securities    
Defined Benefit Plan Disclosure [Line Items]    
Securities 8.00%  
Percentage of total plan assets (less than) 1.00%  
Debt Securities    
Defined Benefit Plan Disclosure [Line Items]    
Securities 5.00%  
Allocation to real estate (as a percent) 44.00% 28.00%
Balanced Funds    
Defined Benefit Plan Disclosure [Line Items]    
Securities 8.00%  
Allocation to real estate (as a percent) 21.00% 31.00%
Other    
Defined Benefit Plan Disclosure [Line Items]    
Securities 9.50%  
Allocation to real estate (as a percent) 9.00% 10.00%
Real Estate    
Defined Benefit Plan Disclosure [Line Items]    
Allocation to real estate (as a percent) 4.00%  
Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Discretionary contributions $ 200,000,000 $ 150,000,000
Pension Plan | 5-Year    
Defined Benefit Plan Disclosure [Line Items]    
Annual rate of return on qualified plan assets 8.40%  
Annual rate of return on qualified plan assets period 5 years  
Pension Plan | 10-Year    
Defined Benefit Plan Disclosure [Line Items]    
Annual rate of return on qualified plan assets 7.20%  
Annual rate of return on qualified plan assets period 10 years  
Pension Plan | 15-Year    
Defined Benefit Plan Disclosure [Line Items]    
Annual rate of return on qualified plan assets 6.80%  
Annual rate of return on qualified plan assets period 15 years  
Pension Plan | 20-Year    
Defined Benefit Plan Disclosure [Line Items]    
Annual rate of return on qualified plan assets 8.50%  
Annual rate of return on qualified plan assets period 20 years  
SG&A | Postretirement Health Coverage    
Defined Benefit Plan Disclosure [Line Items]    
Reduction in the projected postretirement health care benefit obligation $ 58,000,000  
Curtailment gain $ 43,000,000