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Recently Adopted Accounting Pronouncements (Narrative) (Details) $ in Millions	12 Months Ended
	Jan. 29, 2017 USD ($)
Accounting Standards Update 2015-03 [Member] | Other Noncurrent Assets [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact due to adoption of ASU	$ 99
Accounting Standards Update 2015-03 [Member] | Long-term Debt [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact due to adoption of ASU	(99)
Accounting Standards Update 2015-17 [Member] | Other Current Assets [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact due to adoption of ASU	509
Accounting Standards Update 2015-17 [Member] | Other Noncurrent Assets [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact due to adoption of ASU	(32)
Accounting Standards Update 2015-17 [Member] | Other Current Liabilities [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact due to adoption of ASU	(2)
Accounting Standards Update 2015-17 [Member] | Other Noncurrent Liabilities [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact due to adoption of ASU	$ (475)

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