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Quarterly Results (unaudited) (Unaudited Quarterly Results) (Details) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 8,515 | $ 5,626 | $ 5,866 | $ 5,771 | $ 8,869 | $ 5,874 | $ 6,104 | $ 6,232 | $ 25,778 | $ 27,079 | $ 28,105
Cost of sales | (5,251) | (3,386) | (3,468) | (3,516) | (5,549) | (3,537) | (3,610) | (3,800) | (15,621) | (16,496) | (16,863)
Gross margin | 3,264 | 2,240 | 2,398 | 2,255 | 3,320 | 2,337 | 2,494 | 2,432 | 10,157 | 10,583 | 11,242
Selling, general and administrative expenses | (2,202) | (2,071) | (2,026) | (1,966) | (2,207) | (1,968) | (2,058) | (2,023) | (8,265) | (8,256) | (8,355)
Impairments, store closing and other costs | (230) | 0 | (249) | 0 | (177) | (111) | 0 | 0 | (479) | (288) | (87)
Settlement charges | (17) | (62) | (6) | (13) |  |  |  |  | (98) | 0 | 0
Net income attributable to Macy's, Inc. shareholders | $ 475 | $ 17 | $ 11 | $ 116 | $ 544 | $ 118 | $ 217 | $ 193 | $ 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

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