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Accounts Payable and Accrued Liabilities (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Jan. 28, 2017 | Jan. 30, 2016 | Jan. 31, 2015
Accounts Payable and Accrued Liabilities, Current [Abstract] |  |  |
Adjustments to reserve for sales returns | $ (16) | $ 19 | $ 8
Workers compensation and general liability reserves covered by deposits and receivables | $ 112 | $ 112 |

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- Definition Adjustments to Reserve for Sales Returns + References No definition available. + Details
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Namespace Prefix: | m_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Workers compensation and general liability reserves covered by deposits and receivables + References No definition available. + Details
Name: | m_WorkersCompensationAndGeneralLiabilityReservesCoveredByDepositsAndReceivables
Namespace Prefix: | m_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration