Retirement Benefit Plans (Obligations and Funded Status) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Jan. 31, 2015
Feb. 01, 2014
Feb. 02, 2013
Sep. 30, 2012
Jan. 27, 2012
Dec. 31, 2012
Change in fair value of plan assets            
Actual return on plan assets (percent) 15.10%          
Cumulative return on plan assets since inception (percent) 9.10%          
Pension Plan [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Funded status of the plan (percent) 104.00%          
Change in APBO            
Beginning balance 4,477 $ 5,042   $ 5,550    
Service cost 61 78 87      
Interest cost 211 204 242      
Amendments 20 17        
Transfer of benefits 56 0        
Actuarial loss/(gain) 818 (442)        
Benefits (paid) (389) (422)        
Balance at measurement date 5,254 4,477 5,042 5,550    
Change in fair value of plan assets            
Beginning Balance 5,140       5,035  
Company contributions 0 0        
Actual return on assets 723 [1] 527 [1]        
Benefits (paid) (389) (422)        
Balance at measurement date 5,474 5,140     5,035  
Funded status of the plan 220 [2] 663 [2]        
Increase in funded status of plan 443          
Supplemental Employee Retirement Plan [Member]            
Change in APBO            
Beginning balance 219 303   300    
Service cost 0 0 1      
Interest cost 9 12 13      
Amendments 0 (8)        
Transfer of benefits (56) 0        
Actuarial loss/(gain) 39 (34)        
Benefits (paid) (20) (54)        
Balance at measurement date 191 219 303 300    
Change in fair value of plan assets            
Beginning Balance 0       0  
Company contributions 20 54        
Actual return on assets 0 0        
Benefits (paid) (20) (54)        
Balance at measurement date 0 0     0  
Funded status of the plan (191) [3] (219) [3]        
Current portion of pension plan liability accrued 16 44        
Other Postretirement Benefit Plan, Defined Benefit [Member]            
Change in APBO            
Beginning balance 15 18   18    
Interest cost 1 1 1      
Participant contributions 9 13        
Actuarial loss/(gain) (3) 0        
Benefits (paid) (11) (17)        
Balance at measurement date 11 15 18 18    
Change in fair value of plan assets            
Participant contributions 9 13        
Company contributions 2 4        
Benefits (paid) (11) (17)        
Funded status of the plan (11) [4] (15)        
Other Postretirement Benefit Plan, Defined Benefit [Member] | Other Accounts Payable and Accrued Expenses [Member]            
Change in fair value of plan assets            
Funded status of the plan 1 $ 2        
Exceeded 100% [Member] | Pension Plan [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Funded status of the plan (percent)           100.00%
[1] Includes plan administrative expenses.
[2] Presented as Prepaid pension in the Consolidated Balance Sheets.
[3] $16 million in 2014 and $44 million in 2013 were included in Other accounts payable and accrued expenses on the Consolidated Balance Sheets, and the remaining amounts were included in Other liabilities.
[4] Of the total accrued liability, $1 million for 2014 and $2 million for 2013 was included in Other accounts payable and accrued expenses in the Consolidated Balance Sheets, and the remaining amounts were included in Other liabilities.