Earnings Per Share (Computation Of Basic and Diluted Earnings (Loss) Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Jan. 28, 2017	Oct. 29, 2016	Jul. 30, 2016	Apr. 30, 2016	Jan. 30, 2016	Oct. 31, 2015	Aug. 01, 2015	May 02, 2015	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Earnings Per Share [Abstract]
Net income attributable to Macy's, Inc. shareholders	$ 475	$ 17	$ 11	$ 116	$ 544	$ 118	$ 217	$ 193	$ 619	$ 1,072	$ 1,526
Net income (loss) available to common stockholders, basic									619	1,072	1,526
Net income (loss) available to common stockholders, diluted									$ 619	$ 1,072	$ 1,526
Basic earnings per share attributable to Macy's, Inc. shareholders	$ 1.56	$ 0.05	$ 0.03	$ 0.37	$ 1.74	$ 0.36	$ 0.65	$ 0.57	$ 2.01	$ 3.26	$ 4.30
Diluted earnings per share attributable to Macy's, Inc. shareholders	$ 1.54	$ 0.05	$ 0.03	$ 0.37	$ 1.73	$ 0.36	$ 0.64	$ 0.56	$ 1.99	$ 3.22	$ 4.22
Average number of shares issued, basic									307.6	327.6	354.3
Net income									$ 611	$ 1,070	$ 1,526
Shares to be issued under deferred compensation and other plans									0.9	0.8	0.9
Average number of shares outstanding, basic									308.5	328.4	355.2
Effect of dilutive securities-stock options, restricted stock and restricted stock units									2.3	4.6	6.5
Average number of shares outstanding, diluted									310.8	333.0	361.7