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Financing Activities (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Oct. 31, 2015 | Aug. 01, 2015 | Aug. 02, 2014 | Aug. 17, 2015
Stock Repurchased During Period, Shares |  | 13.9 |  |
Stock Repurchased During Period, Value |  | $ 937 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | 1,595 |  |
Subsequent Event [Member] |  |  |  |
Extinguishment of debt | $ 76 |  |  |
Seven Point Five Percent Senior Debentures Due Two Thousand Fifteen [Member] |  |  |  |
Extinguishment of debt |  | $ 69 | $ 0 |
Debt Instrument, Interest Rate, Stated Percentage |  | 7.50% |  |
Five Point Seven Five Percent Senior Notes Due Two Thousand Fourteen [Member] |  |  |  |
Extinguishment of debt |  |  | $ 453 |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.75% |
Eight Point One Two Five Percent Senior Debentures Due Two Thousand Thirty Five [Member] | Subsequent Event [Member] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 8.125%
Three point six two five percent senior notes due two thousand twenty four[Member] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.625% |
Proceeds from Issuance of Debt |  |  | $ 500 |

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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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