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Accounts Payable and Accrued Liabilities (Changes In Workers' Compensation And General Liability Reserves) (Details) - USD ($) $ in Millions | 12 Months Ended
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Jan. 30, 2016 | Jan. 31, 2015 | Feb. 01, 2014
Accounts Payable and Accrued Liabilities, Current [Abstract] |  |  |
Balance, beginning of year | $ 505 | $ 497 | $ 497
Expense for workers compensation and general liability reserves | 159 | 160 | 147
Payments of workers compensation and general liability reserves | (156) | (152) | (147)
Balance, end of year | $ 508 | $ 505 | $ 497

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- Definition Expense for workers compensation and general liability reserves + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Payments of workers compensation and general liability reserves + References No definition available. + Details
Name: | m_Paymentsofworkerscompensationandgeneralliabilityreserves
Namespace Prefix: | m_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Carrying value as of the balance sheet date of obligations and payables pertaining to claims incurred of a workers compensation nature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 5 -Article 9 + Details
Name: | us-gaap_WorkersCompensationLiabilityCurrentAndNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant