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Retirement Benefit Plans (Postretirement Plan (Income)) (Details) (USD $)
In Millions, unless otherwise specified |
0 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
|
Jun. 07, 2005
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Jan. 31, 2015
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Feb. 01, 2014
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Feb. 02, 2013
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| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | ||||
| Net periodic benefit expense/(income) | $ 6 | $ 137 | $ 353 | |
| 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% | |||
| Interest cost | 1 | 1 | 1 | |
| Amortization of actuarial loss/(gain) | (1) | (1) | (1) | |
| Amortization of prior service cost/(credit) | (8) | (8) | (14) | |
| Net periodic benefit expense/(income) | $ (8) | $ (8) | $ (14) | |