Earnings Per Share (Computation Of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	9 Months Ended
Nov. 03, 2018	Oct. 28, 2017	Nov. 03, 2018	Oct. 28, 2017
Earnings Per Share [Abstract]
Net income (loss) attributable to Macy's, Inc. shareholders	$ 62	$ 30	$ 368	$ 219
Net Income (Loss) Available to Common Stockholders, Basic	62	30	368	219
Net Income (Loss) Available to Common Stockholders, Diluted	$ 62	$ 30	$ 368	$ 219
Basic earnings per share attributable to Macy's, Inc. shareholders	$ 0.20	$ 0.10	$ 1.20	$ 0.72
Diluted earnings per share attributable to Macy's, Inc. shareholders	$ 0.20	$ 0.10	$ 1.18	$ 0.71
Weighted Average Number of Shares Issued, Basic	307.2	304.6	306.6	304.5
Shares to be issued under deferred compensation and other plans	0.9	0.9	0.9	0.8
Average number of shares outstanding, basic	308.1	305.5	307.5	305.3
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	4.1	1.0	3.7	1.3
Average number of shares outstanding, diluted	312.2	306.5	311.2	306.6

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities, and addition from assumption of issuance of common shares for dilutive potential common shares; of income (loss) available to common shareholders.

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Shares issuable for little or no cash consideration upon the satisfaction of certain conditions (contingently issuable shares) are considered outstanding common shares and included in the computation of basic Earnings Per Share as of the date that all necessary conditions have been satisfied (in essence, when issuance of the shares is no longer contingent). Outstanding common shares that are contingently returnable (that is, subject to recall) are treated in the same manner as contingently issuable shares. Contingently issuable shares include shares that (a) will be issued in the future upon the satisfaction of specified conditions, (b) have been placed in escrow and all or part must be returned if specified conditions are not met, or (c) have been issued but the holder must return all or part if specified conditions are not met. The number of contingently issuable shares is determined by relating the portion of time within a reporting period that these shares have been outstanding to the total time in that period.

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