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Shareholders' Equity (Deficit) (Narrative) (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended	12 Months Ended
	Feb. 03, 2018	Feb. 03, 2018	Oct. 28, 2017	Apr. 30, 2016
Treasury Stock, Shares, Retired	36
Treasury Stock, Retired, Cost Method, Amount		$ 0
September 2017 Repurchase Program [Member]
Stock Repurchase Program, Authorized Amount			$ 250
February 2016 Repurchase Program [Member]
Stock Repurchase Program, Authorized Amount				$ 500
Retained Earnings (Accumulated Deficit) [Member]
Treasury Stock, Retired, Cost Method, Amount		(1,936)
Paid-in Capital [Member]
Treasury Stock, Retired, Cost Method, Amount		(82)
Common Stock [Member]
Treasury Stock, Retired, Cost Method, Amount		(18)
Treasury Stock, at Average Cost [Member]
Treasury Stock, Retired, Cost Method, Amount		$ 2,036

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+ References

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- Definition

Amount of decrease of par value, additional paid in capital (APIC) and retained earnings of common and preferred stock retired from treasury when treasury stock is accounted for under the cost method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

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