Annual report pursuant to Section 13 and 15(d)

Retirement Benefit Plans (Accumulated Other Comprehensive (Loss)/Income) (Details)

v3.3.1.900
Retirement Benefit Plans (Accumulated Other Comprehensive (Loss)/Income) (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 30, 2016
Jan. 31, 2015
Supplemental Employee Retirement Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Net loss/(gain) $ 13 $ 17
Prior service cost/(credit) (4) (4)
Defined Benefit Plan, Accumulated Other Comprehensive Income, before Tax, Total 9 13
Pension Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Net loss/(gain) 333 213
Prior service cost/(credit) 57 65
Defined Benefit Plan, Accumulated Other Comprehensive Income, before Tax, Total 390 $ 278
Defined Benefit Plan, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year $ 8