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Financing Activities (Detail Of Debt Repayments) (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jul. 30, 2016 | Aug. 01, 2015
Debt repaid | $ 3 | $ 72
7.5% Senior Debentures Due Two Thousand Fifteen [Member] |  |
Extinguishment of debt | 0 | 69
9.5% Amortizing Debentures due Two Thousand Twenty One [Member] |  |
Extinguishment of debt | 2 | 2
9.75% Amortizing Debentures Due Two Thousand Twenty One [Member] |  |
Extinguishment of debt | $ 1 | $ 1

X
- 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

X
- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt and payment of capital lease obligations. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Details
Name: | us-gaap_ShortTermDebtTypeAxis=m_NinePointFivePercentAmortizingDebenturesDueTwoThousandTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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