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Debt (Short-Term Commercial Paper Programs and Line of Credit Facility) (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Jan. 29, 2017 | Jan. 31, 2016
Commercial Paper [Member] |  |
Short-Term Line of Credit and Commercial Paper Programs [Abstract] |  |
Credit Facility Maximum Borrowing Capacity | $ 2,000 |
Balance outstanding at fiscal year-end | 710 | $ 350
Maximum Amount Outstanding at Any Month-End | 710 | 350
Average Daily Short-Term Borrowings | $ 51 | $ 69
Weighted Average Interest Rate | 0.63% | 0.34%
Revolving Credit Facility [Member] |  |
Short-Term Line of Credit and Commercial Paper Programs [Abstract] |  |
Credit Facility Maximum Borrowing Capacity | $ 2,000 |
Credit Facility Expiration Date | Dec. 31, 2019 |

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- Definition Fair value of the amount outstanding under the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13476-108611 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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