Retirement Benefit Plans (Net Periodic Expense) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended
Oct. 27, 2012
Oct. 29, 2011
Oct. 27, 2012
Oct. 29, 2011
Sep. 30, 2012
Jan. 28, 2012
Oct. 27, 2012
Pension Plans, Defined Benefit [Member]
Oct. 29, 2011
Pension Plans, Defined Benefit [Member]
Oct. 27, 2012
Pension Plans, Defined Benefit [Member]
Oct. 29, 2011
Pension Plans, Defined Benefit [Member]
Oct. 27, 2012
Pension Plans [Member]
Oct. 29, 2011
Pension Plans [Member]
Oct. 27, 2012
Pension Plans [Member]
Oct. 29, 2011
Pension Plans [Member]
Sep. 30, 2012
Benefits Plan Primary Plan [Member]
Oct. 27, 2012
Benefits Plan Primary Plan [Member]
Oct. 29, 2011
Benefits Plan Primary Plan [Member]
Oct. 27, 2012
Benefits Plan Primary Plan [Member]
Oct. 29, 2011
Benefits Plan Primary Plan [Member]
Sep. 30, 2012
Benefits Supplemental Plan [Member]
Oct. 27, 2012
Benefits Supplemental Plan [Member]
Oct. 29, 2011
Benefits Supplemental Plan [Member]
Oct. 27, 2012
Benefits Supplemental Plan [Member]
Oct. 29, 2011
Benefits Supplemental Plan [Member]
Sep. 30, 2012
Other Postretirement Benefit Plans, Defined Benefit [Member]
Oct. 27, 2012
Other Postretirement Benefit Plans, Defined Benefit [Member]
Oct. 29, 2011
Other Postretirement Benefit Plans, Defined Benefit [Member]
Oct. 27, 2012
Other Postretirement Benefit Plans, Defined Benefit [Member]
Oct. 29, 2011
Other Postretirement Benefit Plans, Defined Benefit [Member]
Service cost             $ 21 $ 23 $ 68 $ 68 $ 21 $ 23 $ 68 $ 68   $ 21 $ 22 $ 67 $ 66     $ 1 $ 1 $ 2          
Interest cost             64 65 196 195 64 65 195 195   61 62 185 186   3 3 10 9       1  
Expected return on plan assets             (95) (97) (284) (290) (95) (97) (284) (290)   (95) (97) (284) (290)                    
Net amortization             57 34 177 96 61 40 188 115   55 35 171 103   6 5 17 12   (4) (6) (11) (19)
Net periodic plan expense/(income) 51 31 167 88     47 25 157 69 51 31 167 88   42 22 139 65   9 9 28 23   (4) (6) (10) (19)
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments 7                                                        
Defined Benefit Plan, Effect of Curtailments on Projected Benefit Obligation                               80   80     13   13     2   2  
Discount rate         4.25% 4.82%                                              
Projected Benefit Obligation, Period Decrease                             166         55         (5)        
Balance at measurement date                             $ 5,550         $ 300         $ 18        
Defined Benefit Plan, Description of Settlements and Curtailments In September 2012, we offered approximately 35,000 participants in the Primary Pension Plan who have separated from service and had a deferred vested benefit as of August 31, 2012 the option to receive a lump-sum settlement payment. These participants had until November 30, 2012 to elect to receive the lump-sum settlement payment with the payments to be made by the Company beginning on December 4, 2012 using assets from the Primary Pension Plan.