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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 28, 2018	Jan. 29, 2017	Jan. 31, 2016
Reconciliation of gross unrecognized tax benefits:
Unrecognized tax benefits balance at beginning of fiscal year	$ 659	$ 689	$ 765
Additions based on tax positions related to the current year	74	147	169
Additions for tax positions of prior years	15	14	126
Reductions for tax positions of prior years	(93)	(161)	(350)
Reductions due to settlements	(1)	(16)	(14)
Reductions due to lapse of statute of limitations	(17)	(14)	(7)
Unrecognized tax benefits balance at end of fiscal year	$ 637	$ 659	$ 689

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

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Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
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-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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-Name Accounting Standards Codification
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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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