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Pension and Postretirement Health Care Plans - Schedule of Fair Value Measurements (Details) - USD ($) $ in Millions | Jan. 30, 2016 | Jan. 31, 2015
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Total plan assets | $ 1,500 | $ 948
Accounting Standards Update 2015-07 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total plan assets | 3,607 | 3,784
Cash and cash equivalents | Accounting Standards Update 2015-07 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total plan assets | 455 | 204
Common collective trusts | Accounting Standards Update 2015-07 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total plan assets | 544 | 1,102
Fixed income | Accounting Standards Update 2015-07 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total plan assets | 49 | 53
Balanced funds | Accounting Standards Update 2015-07 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total plan assets | 756 | 1,152
Private equity funds | Accounting Standards Update 2015-07 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total plan assets | 141 | 171
Other | Accounting Standards Update 2015-07 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total plan assets | 162 | 154
Level 1 | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total plan assets | 43 | 7
Level 2 | Government securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total plan assets | 470 | 349
Level 2 | Fixed income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total plan assets | 979 | 571
Level 2 | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total plan assets | $ 8 | $ 21

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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