Annual report pursuant to Section 13 and 15(d)

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

v3.6.0.2
Retirement Benefit Plans (Postretirement Plan (Income)) (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 07, 2005
Jan. 28, 2017
Jan. 30, 2016
Jan. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Net periodic benefit expense/(income)   $ (19) $ (162) $ 48
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%      
Net periodic benefit expense/(income)   $ 17 7 $ 8
Accumulated postretirement benefit obligation     $ 8