Retirement Benefit Plans (Net Periodic Expense) (Details)
$ in Millions |
3 Months Ended |
6 Months Ended |
|
|
|
Aug. 04, 2018
USD ($)
|
Jul. 29, 2017
USD ($)
|
Apr. 29, 2017
USD ($)
employee
|
Aug. 04, 2018
USD ($)
|
Jul. 29, 2017
USD ($)
|
Mar. 31, 2017
Rate
|
Jan. 28, 2017
Rate
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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| Number of employees eligible for VERP | employee |
|
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6,000
|
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| Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | Rate |
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4.34%
|
4.40%
|
| Service cost |
$ 10
|
$ 10
|
|
|
$ 19
|
$ 21
|
|
|
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| Interest cost |
35
|
37
|
|
|
70
|
76
|
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| Expected return on plan assets |
(56)
|
(53)
|
|
|
(112)
|
(107)
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| Amortization of prior service cost/(credit) |
2
|
2
|
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|
4
|
4
|
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| Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement |
0
|
0
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|
|
0
|
0
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| Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment |
0
|
0
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|
$ (7)
|
0
|
7
|
|
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| Net periodic pension expense/(income) |
(9)
|
(4)
|
|
|
(19)
|
113
|
|
|
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| Number of employees accepted VERP | employee |
|
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2,800
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| Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits |
0
|
0
|
|
$ (112)
|
0
|
112
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| Other components of net periodic pension cost/(income) |
$ (19)
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$ (14)
|
[1] |
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$ (38)
|
$ 92
|
[1] |
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