Retirement Benefit Plans (Net Periodic Expense) (Details)
$ in Millions |
3 Months Ended |
9 Months Ended |
|
|
|
Nov. 03, 2018
USD ($)
|
Oct. 28, 2017
USD ($)
Rate
|
Apr. 29, 2017
USD ($)
employee
|
Nov. 03, 2018
USD ($)
|
Oct. 28, 2017
USD ($)
Rate
|
Mar. 31, 2017
Rate
|
Jan. 28, 2017
Rate
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
|
|
|
|
|
|
|
| Number of employees eligible for VERP | employee |
|
|
|
6,000
|
|
|
|
|
|
| Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | Rate |
|
3.94%
|
|
|
|
3.94%
|
|
4.34%
|
4.40%
|
| Service cost |
$ 9
|
$ 11
|
|
|
$ 28
|
$ 32
|
|
|
|
| Interest cost |
34
|
38
|
|
|
104
|
114
|
|
|
|
| Expected return on plan assets |
(55)
|
(53)
|
|
|
(167)
|
(160)
|
|
|
|
| Amortization of prior service cost/(credit) |
2
|
1
|
|
|
6
|
5
|
|
|
|
| Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement |
0
|
12
|
|
|
0
|
12
|
|
|
|
| Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment |
0
|
0
|
|
$ (7)
|
0
|
7
|
|
|
|
| Net periodic pension expense/(income) |
(10)
|
9
|
|
|
(29)
|
122
|
|
|
|
| Number of employees accepted VERP | employee |
|
|
|
2,800
|
|
|
|
|
|
| Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits |
0
|
0
|
|
$ (112)
|
0
|
112
|
|
|
|
| Other components of net periodic pension cost/(income) |
$ (19)
|
$ (2)
|
[1] |
|
$ (57)
|
$ 90
|
[1] |
|
|
|
|