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Financing Activities (Details) - USD ($) shares in Millions, $ in Millions | 9 Months Ended
--- | ---
Oct. 31, 2015 | Nov. 01, 2014
Stock Repurchased During Period, Shares | 30.6 |
Stock Repurchased During Period, Value | $ 1,837 |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | 695 |
Commercial Paper Facility Maximum Borrowing Capacity | 1,500 |
Commercial Paper | $ 791 |
Commercial Paper, Weighted Average Interest Rate | 0.42% |
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] |  |
Extinguishment of debt | $ 76 | $ 0
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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