XML 47 R34.htm IDEA: XBRL DOCUMENT
v3.21.2

Benefit Plans (Narrative) (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 30, 2021 USD ($) | Jul. 31, 2021 USD ($) | Oct. 31, 2020 USD ($) | Oct. 30, 2021 USD ($) Hour | Oct. 31, 2020 USD ($)
Pension And Other Postretirement Benefit Expense [Abstract] |  |  |  |  |
Number of hours required for participation in defined benefit and defined contribution plans | Hour |  |  |  | 1,000 |
Defined benefit plan, amount of transferred pension plan assets |  | $ 256 |  |  |
Defined benefit plan, settlement charges | $ 8 |  | $ 26 | $ 90 | $ 65

X
- Definition Number Of Hours Required For Participation In Defined Benefit And Defined Contribution Plans + References No definition available. + Details
Name: | m_NumberOfHoursRequiredForParticipationInDefinedBenefitAndDefinedContributionPlans
Namespace Prefix: | m_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of increase (decrease) in plan assets of defined benefit plan from assets transferred into (from) plan. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanAssetsTransferredToFromPlan
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(7) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
Name: | us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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