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v3.21.1

Statements of Unaudited Condensed Consolidated Changes in Equity Statement - USD ($) $ in Millions | Total | Common Stock | Capital in Excess of Par Value of Shares | Retained Deficit | Common Shares in Treasury | AOCI | Non-controlling Interests
--- | --- | --- | --- | --- | --- | --- | ---
Balance, beginning of period (in shares) at Dec. 31, 2019 |  | 271,000,000 |  |  |  |  |
Balance, beginning of period at Dec. 31, 2019 | $ 358 | $ 37 | $ 3,873 | $ (2,842) | $ (391) | $ (319) | $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Comprehensive income (loss) | (47) |  |  | (52) |  | 2 | 3
Stock and other incentive plans (in shares) |  | 1,000,000 |  |  |  |  |
APIC, Share-based Payment Arrangement, Increase for Cost Recognition |  |  | (24) |  |  |  |
Stock and other incentive plans | 2 |  |  |  | 26 |  |
Stock issued during period, shares, acquisitions (in shares) |  | 127,000,000 |  |  |  |  |
Acquisition of AK Steel | 948 | $ 16 | 602 |  |  |  | 330
Net distributions to noncontrolling interests | (6) |  |  |  |  |  | (6)
Common stock dividends | (24) |  |  | (24) |  |  |
Balance, end of period (in shares) at Mar. 31, 2020 |  | 399,000,000 |  |  |  |  |
Balance, end of period at Mar. 31, 2020 | $ 1,231 | $ 53 | 4,451 | (2,918) | (365) | (317) | 327
Balance, beginning of period (in shares) at Dec. 31, 2020 | 477,517,372 | 478,000,000 |  |  |  |  |
Balance, beginning of period at Dec. 31, 2020 | $ 2,341 | $ 63 | 5,431 | (2,989) | (354) | (133) | 323
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Comprehensive income (loss) | 70 |  |  | 41 |  | 13 | 16
Issuance of common stock (in shares) |  | 20,000,000 |  |  |  |  |
Issuance of common stock | 322 | $ 0 | 78 |  | 244 |  |
Stock and other incentive plans (in shares) |  | 1,000,000 |  |  |  |  |
APIC, Share-based Payment Arrangement, Increase for Cost Recognition |  |  | (22) |  |  |  |
Stock and other incentive plans | (5) |  |  |  | 17 |  |
Acquisition of ArcelorMittal USA - Measurement period adjustments | (1) |  |  |  |  |  | (1)
Net distributions to noncontrolling interests | $ (8) |  |  |  |  |  | (8)
Balance, end of period (in shares) at Mar. 31, 2021 | 499,214,434 | 499,000,000 |  |  |  |  |
Balance, end of period at Mar. 31, 2021 | $ 2,719 | $ 63 | $ 5,487 | $ (2,948) | $ (93) | $ (120) | $ 330

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