Long-term Debt (Issuance And Repurchase Of Notes) (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jul. 30, 2016	Jul. 29, 2017	Jul. 30, 2016
Proceeds from Debt, Net of Issuance Costs		$ 0	$ 692
Debt Instrument, Repurchase Amount		0	742
Gain (Loss) on Extinguishment of Debt		$ 0	(36)
Fixed Rate 6.75% Notes Due July 2036 [Member]
Debt Instrument, Face Amount	$ 700		$ 700
Debt instrument, stated rate	6.75%		6.75%
Proceeds from Debt, Net of Issuance Costs	$ 692
Payments of Debt Issuance Costs	8		$ 8
Fixed Rate 6.90% Notes Due July 2017 [Member]
Extinguishment of Debt, Amount	700
Debt Instrument, Repurchase Amount	742
Gain (Loss) on Extinguishment of Debt	(36)
Extinguishment of Debt, Gain (Loss), Net of Tax	(22)
Gain (Loss) on Hedging Activity	$ 7

Face (par) amount of debt instrument at time of issuance.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Section 45
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Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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- Definition

Gross amount of debt extinguished.

+ References

No definition available.

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The difference between the reacquisition price and the net carrying amount of the extinguished debt recognized currently as a component of income in the period of extinguishment, net of tax.

+ References

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Gain (loss) incurred in hedging activities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

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No definition available.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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