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Commitments and Contingencies (Letters of Credit) (Narrative) (Details) $ in Millions	Jan. 28, 2018 USD ($)
Other Liabilities, Unclassified [Abstract]
Outstanding letters of credit	$ 447

X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_OtherLiabilitiesUnclassifiedAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration