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Stockholders' Equity (Accelerated Share Repurchases) (Details) - USD ($) shares in Millions, $ in Millions | 1 Months Ended | 2 Months Ended | 3 Months Ended | 5 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jul. 30, 2017 | Jul. 11, 2017 | Jan. 31, 2016 | Jan. 05, 2016 | May 03, 2015 | Apr. 15, 2015 | Jan. 28, 2018 | Nov. 16, 2017 | Jul. 30, 2017 | Jan. 31, 2016 | May 03, 2015 | Jan. 31, 2016 | Nov. 01, 2015 | Aug. 02, 2015 | Jan. 28, 2018 | Jan. 31, 2016 | Nov. 01, 2015 | Jan. 28, 2018 | Jan. 29, 2017 | Jan. 31, 2016
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for repurchases of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,000 | $ 6,880 | $ 7,000
Repurchases of common stock through accelerated share agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49.0 | 53.0 | 59.0
Q1 Accelerated Share Repurchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for repurchases of common stock |  |  |  |  |  |  |  |  |  |  | $ 850 |  |  |  |  |  |  |  |  |
Repurchases of common stock through accelerated share agreements |  |  |  |  | 0.5 | 7.0 |  |  |  |  | 7.5 |  |  |  |  |  |  |  |  |
Q2 Accelerated Share Repurchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for repurchases of common stock |  |  |  |  |  |  |  |  | $ 1,650 |  |  |  |  |  |  |  | $ 1,500 |  |  |
Repurchases of common stock through accelerated share agreements | 1.1 | 9.7 |  |  |  |  |  |  | 10.8 |  |  |  | 1.3 | 12.0 |  |  | 13.3 |  |  |
Q3 Accelerated Share Repurchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for repurchases of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,200 | $ 1,375 |  |  |  |
Repurchases of common stock through accelerated share agreements |  |  |  |  |  |  | 0.7 | 6.7 |  |  |  | 1.3 | 10.1 |  | 7.4 | 11.4 |  |  |  |
Q4 Accelerated Share Repurchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for repurchases of common stock |  |  |  |  |  |  |  |  |  | $ 1,500 |  |  |  |  |  |  |  |  |  |
Repurchases of common stock through accelerated share agreements |  |  | 1.7 | 9.7 |  |  |  |  |  | 11.4 |  |  |  |  |  |  |  |  |  |

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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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