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Income Taxes (Activity Related to its Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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Jan. 28, 2017 | Jan. 30, 2016 | Jan. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Gross Unrecognized Tax Benefits, as of the Beginning of the Fiscal Year | $ 248 | $ 193 | $ 167
Increases in Tax Benefits for Prior Years | 3 | 8 | 16
Decreases in Tax Benefits for Prior Years | (73) | (3) | (14)
Increases in Unrecognized Tax Benefits as a Result of Current Year Activity | 18 | 54 | 36
Decreases to Unrecognized Tax Benefits Relating to Settlements with Taxing Authorities | (98) | 0 | (5)
Decreases to Unrecognized Tax Benefits as a Result of a Lapse of the Applicable Statute of Limitations | (8) | (4) | (7)
Gross Unrecognized Tax Benefits, as of the End of the Fiscal Year | $ 90 | $ 248 | $ 193

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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 + Details
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