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Financing Activities (Detail Of Debt Repayments) (Details) - USD ($) $ in Millions | 3 Months Ended
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May 04, 2019 | May 05, 2018
Repayments of Debt | $ 3 | $ 3
Nine Point Seven Five Percent Amortizing Debentures Due Two Thousand Twenty One [Member] |  |
Extinguishment of debt | 1 | 1
Nine Point Five Percent Amortizing Debentures Due Two Thousand Twenty One [Member] |  |
Extinguishment of debt | $ 2 | $ 2

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- Definition Gross amount of debt extinguished. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
Name: | us-gaap_RepaymentsOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=m_NinePointSevenFivePercentAmortizingDebenturesDueTwoThousandTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |