Retirement Benefit Plans (Obligations and Funded Status) (Details) (USD $)
In Millions, unless otherwise specified
 0 Months Ended 12 Months Ended
Sep. 30, 2012
Oct. 15, 2011
Feb. 02, 2013
Jan. 28, 2012
Jan. 29, 2011
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]          
Special termination benefits   $ 176      
Defined Benefit Plan, Actual Return on Plan Assets [Abstract]          
Balance at measurement date     47    
Current Portion of Pension Plan Liability Accrued     53 45  
Primary Plan Benefits [Member]
          
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]          
Beginning balance     5,297 4,488  
Service cost     87 88 88
Interest cost     242 247 248
Special termination benefits   133   133  
Amendments     42    
Curtailments     (80)    
Settlements     (439)    
Actuarial loss/(gain)     204 612  
Benefits (paid)     (311) (271)  
Projected benefit obligation, period increase/(decrease) 166        
Balance at measurement date 5,550   5,042 5,297 4,488
Defined Benefit Plan, Accumulated Benefit Obligation     4,700 4,900  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Beginning balance     5,176 5,251  
Defined Benefit Plan, Actual Return on Plan Assets [Abstract]          
Actual return on assets     609 [1] 196 [1]  
Settlements     (439)    
Benefits (paid)     (311) (271)  
Balance at measurement date     5,035 5,176 5,251
Funded status of the plan     (7) [2] (121) [2]  
Supplemental Plan Benefits [Member]
          
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]          
Beginning balance     309 222  
Service cost     1 2 1
Interest cost     13 13 14
Special termination benefits       43  
Amendments       3  
Curtailments     (13)    
Actuarial loss/(gain)     59 65  
Benefits (paid)     (66) (39)  
Projected benefit obligation, period increase/(decrease) 55        
Balance at measurement date 300   303 309 222
Defined Benefit Plan, Accumulated Benefit Obligation     268 272  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Company contributions     66 39  
Defined Benefit Plan, Actual Return on Plan Assets [Abstract]          
Benefits (paid)     (66) (39)  
Funded status of the plan     (303) [3] (309) [3]  
Other Postretirement Benefit Plans, Defined Benefit [Member]
          
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]          
Beginning balance     24 15  
Interest cost     1 1 1
Curtailments     (2)    
Participant contributions     14 11  
Actuarial loss/(gain)     (3) 9  
Benefits (paid)     (16) (12)  
Projected benefit obligation, period increase/(decrease) (5)        
Balance at measurement date 18   18 24 15
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Participant contributions     14 11  
Company contributions     2 1  
Defined Benefit Plan, Actual Return on Plan Assets [Abstract]          
Benefits (paid)     (16) (12)  
Funded status of the plan     (18) [4] (24) [4]  
Current Portion of Pension Plan Liability Accrued     $ 2 $ 3  
[1] Includes plan administrative expenses.
[2] Included in other liabilities in the Consolidated Balance Sheets.
[3] $53 million in 2012 and $45 million in 2011 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, $2 million for 2012 and $3 million for 2011 was included in other accounts payable and accrued expenses in the Consolidated Balance Sheets, and the remaining amounts were included in other liabilities.