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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Jan. 28, 2017 | Jan. 30, 2016 | Jan. 31, 2015 | Feb. 26, 2016 | Feb. 01, 2014
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, shares authorized | 125,000,000 |  |  |  |
Preferred stock, par value | $ 0.01 |  |  |  |
Preferred stock, shares issued | 0 |  |  |  |
Common stock, shares authorized | 1,000,000,000 |  |  |  |
Common stock, par value | $ 0.01 |  |  |  |
Common stock, shares issued | 333,605,800 | 341,605,800 | 379,605,800 |  | 410,605,800
Common stock, shares outstanding | 304,062,800 | 310,256,100 | 340,573,700 |  | 364,935,000
Retirement of common stock | 8,000,000 | 38,000,000 | 31,000,000 |  |
Stock Repurchase Program, Additional Authorized Amount |  |  |  | $ 1,500 |
Stock repurchase program authorized amount | $ 18,000 |  |  |  |
Stock repurchased during period, shares | 7,900,000 | 34,800,000 | 31,900,000 |  |
Stock repurchased during period, value | $ 316 | $ 2,000 | $ 1,900 |  |
Stock repurchase program remaining authorized repurchase amount | $ 1,716 |  |  |  |

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