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Supplemental Financial Information (unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales | $ 1,238 | $ 1,134 | $ 1,253 | $ 1,634 | $ 1,734 | $ 1,794 | $ 1,818 | $ 1,752 | $ 5,259 | $ 7,098 | $ 6,778
Net income from continuing operations attributable to common shareholders: | $ 106 | $ 36 | $ (84) | $ 153 | $ 118 | $ 58 | $ (136) | $ 86 | $ 211 | $ 126 | $ 309
Net income (loss) per share from continuing operations attributable to Howmet common shareholders |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from continuing operations - basic (in usd per share) | $ 0.24 | $ 0.08 | $ (0.19) | $ 0.35 | $ 0.27 | $ 0.13 | $ (0.31) | $ 0.18 | $ 0.48 | $ 0.28 | $ 0.64
Net income (loss) from continuing operations - diluted (in usd per share) | $ 0.24 | $ 0.08 | $ (0.19) | $ 0.34 | $ 0.27 | $ 0.13 | $ (0.31) | $ 0.18 | $ 0.48 | $ 0.27 | $ 0.63
Restructuring and other charges (E) |  |  |  |  |  |  |  |  | $ 182 | $ 582 | $ 163
U.K. Forging Business |  |  |  |  |  |  |  |  |  |  |
Net income (loss) per share from continuing operations attributable to Howmet common shareholders |  |  |  |  |  |  |  |  |  |  |
Restructuring and other charges (E) |  |  | $ 62 |  |  |  |  |  |  |  |
Financing |  |  |  |  |  |  |  |  |  |  |
Net income (loss) per share from continuing operations attributable to Howmet common shareholders |  |  |  |  |  |  |  |  |  |  |
Restructuring and other charges (E) |  |  | $ 59 |  |  |  |  |  |  |  |
Impairment Of Disks |  |  |  |  |  |  |  |  |  |  |
Net income (loss) per share from continuing operations attributable to Howmet common shareholders |  |  |  |  |  |  |  |  |  |  |
Restructuring and other charges (E) |  |  |  |  |  |  | $ 428 |  |  | $ 428 |

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