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Statements of Consolidated Changes in Equity - USD ($) $ in Millions | Total | AK Steel [Member] | ArcelorMittal USA [Member] | Common Stock [Member] | Common Stock [Member] AK Steel [Member] | Common Stock [Member] ArcelorMittal USA [Member] | Capital in Excess of Par Value of Shares [Member] | Capital in Excess of Par Value of Shares [Member] AK Steel [Member] | Capital in Excess of Par Value of Shares [Member] ArcelorMittal USA [Member] | Retained Earnings [Member] | Common Shares in Treasury [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Noncontrolling Interest [Member] | Noncontrolling Interest [Member] AK Steel [Member] | Noncontrolling Interest [Member] ArcelorMittal USA [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance, beginning of period (in shares) at Dec. 31, 2017 |  |  |  | 297,000,000 |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period at Dec. 31, 2017 | $ (445) |  |  | $ 37 |  |  | $ 3,934 |  |  | $ (4,207) | $ (170) | $ (39) | $ 0 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adoption of accounting standard | Accounting Standards Update 2014-09 | 34 |  |  |  |  |  |  |  |  | 34 |  |  |  |  |
Comprehensive income | 883 |  |  |  |  |  |  |  |  | 1,128 |  | (245) | 0 |  |
Stock and other incentive plans (in shares) |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Stock and other incentive plans, APIC |  |  |  |  |  |  | (17) |  |  |  |  |  |  |  |
Stock and other incentive plans | 14 |  |  |  |  |  |  |  |  |  | 31 |  |  |  |
Common stock repurchases (in shares) |  |  |  | (5,000,000) |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased (value) | $ (47) |  |  |  |  |  |  |  |  |  | (47) |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ 0.05 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividends | $ (15) |  |  |  |  |  |  |  |  | (15) |  |  |  |  |
Balance, end of period (in shares) at Dec. 31, 2018 |  |  |  | 293,000,000 |  |  |  |  |  |  |  |  |  |  |
Balance, end of period at Dec. 31, 2018 | 424 |  |  | $ 37 |  |  | 3,917 |  |  | (3,060) | (186) | (284) | 0 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Comprehensive income | 258 |  |  |  |  |  |  |  |  | 293 |  | (35) | 0 |  |
Stock and other incentive plans (in shares) |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |
Stock and other incentive plans, APIC |  |  |  |  |  |  | (44) |  |  |  |  |  |  |  |
Stock and other incentive plans | 4 |  |  |  |  |  |  |  |  |  | 48 |  |  |  |
Common stock repurchases (in shares) |  |  |  | (24,000,000) |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased (value) | $ (253) |  |  |  |  |  |  |  |  |  | (253) |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ 0.27 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividends | $ (75) |  |  |  |  |  |  |  |  | (75) |  |  |  |  |
Balance, end of period (in shares) at Dec. 31, 2019 | 270,084,005 |  |  | 271,000,000 |  |  |  |  |  |  |  |  |  |  |
Balance, end of period at Dec. 31, 2019 | $ 358 |  |  | $ 37 |  |  | 3,873 |  |  | (2,842) | (391) | (319) | 0 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Comprehensive income | 105 |  |  |  |  |  |  |  |  | (122) |  | 186 | 41 |  |
Stock and other incentive plans (in shares) |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |
Stock and other incentive plans, APIC |  |  |  |  |  |  | (24) |  |  |  |  |  |  |  |
Stock and other incentive plans | $ 13 |  |  |  |  |  |  |  |  |  | 37 |  |  |  |
Stock Issued During Period, Shares, Acquisitions |  |  |  |  | 127,000,000 | 78,000,000 |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions |  | $ 948 | $ 1,003 |  | $ 16 | $ 10 |  | $ 602 | $ 980 |  |  |  |  |  |
Noncontrolling Interest, Increase from Business Combination |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 330 | $ 13
Common Stock, Dividends, Per Share, Declared | $ 0.06 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividends | $ (25) |  |  |  |  |  |  |  |  | (25) |  |  |  |  |
Distributions of partnership equity | $ (61) |  |  |  |  |  |  |  |  |  |  |  | (61) |  |
Balance, end of period (in shares) at Dec. 31, 2020 | 477,517,372 |  |  | 478,000,000 |  |  |  |  |  |  |  |  |  |  |
Balance, end of period at Dec. 31, 2020 | $ 2,341 |  |  | $ 63 |  |  | $ 5,431 |  |  | $ (2,989) | $ (354) | $ (133) | $ 323 |  |

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