Income Taxes (Activity Related to its Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
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

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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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

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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