Quarterly report pursuant to Section 13 or 15(d)

Retirement Benefit Plans (Net Periodic Expense) (Details)

v3.7.0.1
Retirement Benefit Plans (Net Periodic Expense) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 29, 2017
Jul. 30, 2016
Jul. 29, 2017
Jul. 30, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Net periodic benefit expense/(income) $ (4) $ 2 $ (6) $ 4
Other Postretirement Benefits Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Net periodic benefit expense/(income)   (4)   (8)
Primary Pension Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 10 14 21 28
Interest cost 36 38 73 76
Expected return on plan assets (53) (54) (107) (108)
Amortization of prior service cost/(credit) 2 2 4 4
Net periodic benefit expense/(income) (5) 0 (9) 0
Supplemental Pension Plans        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 0 0 0 0
Interest cost 1 2 3 4
Net periodic benefit expense/(income) 1 2 3 4
Primary and Supplemental Pension Plans Total [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 10 14 21 28
Interest cost 37 40 76 80
Expected return on plan assets (53) (54) (107) (108)
Amortization of prior service cost/(credit) 2 2 4 4
Net periodic benefit expense/(income) $ (4) $ 2 $ (6) $ 4