Annual report pursuant to Section 13 and 15(d)

Retirement Benefit Plans (Postretirement Plan (Income)) (Details)

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Retirement Benefit Plans (Postretirement Plan (Income)) (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended 12 Months Ended
Jun. 07, 2005
Feb. 01, 2014
Feb. 02, 2013
Jan. 28, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Net periodic benefit expense/(income)   $ 137 $ 353 $ 121
Other Postretirement Benefit Plan, Defined Benefit [Member]
       
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Reduction of plan benefits, employee age (post-age) 65 years      
Reduction of plan benefits (percent) 45.00%      
Interest cost   1 1 1
Amortization of actuarial loss/(gain)   (1) (1) (1)
Amortization of prior service cost/(credit)   (8) (14) (25)
Net periodic benefit expense/(income)   $ (8) $ (14) $ (25)