Annual report pursuant to Section 13 and 15(d)

Retirement Benefit Plans (Defined Benefit Plans) (Details)

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Retirement Benefit Plans (Defined Benefit Plans) (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended
Oct. 15, 2011
Jun. 05, 2010
Jan. 28, 2012
Jan. 29, 2011
Jan. 30, 2010
Jan. 28, 2012
Benefits Plan Primary Plan [Member]
Jan. 28, 2012
Benefits Supplemental Plan [Member]
Jan. 29, 2011
Benefits Supplemental Plan [Member]
Jan. 29, 2011
Supplemental Retirement Program and Benefit Restoration Plan [Member]
May 24, 2010
Pension Plans, Defined Benefit [Member]
Oct. 15, 2011
Benefits Plan Primary Plan [Member]
Jan. 28, 2012
Benefits Plan Primary Plan [Member]
Jan. 29, 2011
Benefits Plan Primary Plan [Member]
Jan. 28, 2012
Benefits Supplemental Plan [Member]
Jan. 29, 2011
Benefits Supplemental Plan [Member]
Oct. 15, 2011
Supplemental Retirement Program and Benefit Restoration Plan [Member]
Oct. 15, 2011
Supplemental Retirement Program [Member]
Oct. 15, 2011
Benefit Restoration Plan [Member]
Enhanced Retirement Beneifts, Number of Employees Eligible 8,000                                  
Enhanced Reitirement Benefits, Number of Employees Accepted 4,000                                  
Enhanced Retirement Benefits, Amount $ 176                   $ 133 $ 133   $ 43     $ 36 $ 7
Defined Benefit Plan, Curtailments 1                                  
Discount rate     4.82% 5.65% 5.90%       5.65%             5.06%    
Projected Benefit Obligation, Period Increase                                 71 24
Defined Benefit Plan Funded Status Of Plan Percentage           98.00%                        
Defined Benefit Plan, Actual Return on Plan Assets, Percent     4.60%                              
Defined Benefit Plan, Cumulative Return on Plan Assets Since Inception, Percent     8.90%                              
Defined Benefit Plan, Accumulated Benefit Obligation                       4,900 4,100 272 194      
Pension contribution from issuance of $400 million of 5.65% Senior Notes due 2020   392   392           392                
Defined Benefit Plan, Expected Future Benefit Payments in Year One     $ 4     $ 284 $ 46 $ 29