Debt instrument, accrued and unpaid interest.

No definition available.

Name:	m_DebtInstrumentAccruedAndUnpaidInterest
Namespace Prefix:	m_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line of Credit Facility, Additional Borrowing Capacity Available

+ References

No definition available.

+ Details

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Namespace Prefix:	m_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

+ References

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

- Definition

Percentage of principal amount of debt redeemed.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value amount of debt instrument that was repurchased.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Face (par) amount of the original debt instrument that was repurchased.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Balance Type:	credit
Period Type:	duration

- Definition

Reflects the difference between the fair value of payments made to legally extinguish a debt and its carrying value at that time. This item excludes the write-off of amounts previously capitalized as debt issuance costs.

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- Definition

Fair value of the amount outstanding under the credit facility.

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Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Balance Type:	credit
Period Type:	instant

- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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Financing Activities (Narrative) (Details) - USD ($)				3 Months Ended			9 Months Ended
Financing Activities (Narrative) (Details) - USD ($)	Oct. 15, 2021	Aug. 17, 2021	Mar. 17, 2021	Oct. 30, 2021	May 01, 2021	Oct. 31, 2020	Oct. 30, 2021	Oct. 31, 2020
Gains (losses) on retirement of debt				$ 185,000,000	$ 11,000,000	$ 0	$ 199,000,000	$ 0
Extinguishment of debt			$ 500,000,000
Debt Instrument, Repurchase Amount			$ 17,000,000
Gains (losses) on retirement of debt				(185,000,000)	$ (11,000,000)	$ 0	(199,000,000)	$ 0
3.875% Senior Notes Due 2022 [Member]
Debt instrument, redeemed in principal amount	$ 294,000,000
Debt instrument interest rate, stated percentage	3.875%
Debt instrument, redemption price, percentage of principal amount redeemed	100.00%
Debt instrument, accrued and unpaid interest	$ 3,000,000
8.375% Senior secured notes due 2025 [Member]
Debt instrument, redeemed in principal amount		$ 1,300,000,000
Debt instrument interest rate, stated percentage		8.375%
Debt instrument, redemption price, percentage of principal amount redeemed		100.00%
Debt instrument, accrued and unpaid interest		$ 19,000,000
Gain (loss) on early redemption of debt before write off		138,000,000
Unamortized deferred debt costs		$ 47,000,000
5.875% Senior Notes due 2029 [Member]
Debt instrument interest rate, stated percentage			5.875%
Face amount			$ 500,000,000
Debt instrument, maturity date			Apr. 01, 2029
ABL Borrower [Member] \| Revolving Credit Facility [Member]
Additional borrowing capacity available				750,000,000			750,000,000
Revolving ABL Facility [Member] \| ABL Borrower [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity				2,941,000,000			2,941,000,000
Amount Outstanding Under Credit Facility				$ 140,000,000			$ 140,000,000