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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
Common stock dividends | (24) |  |  | (24) |  |  |
Net distributions to noncontrolling interests | (6) |  |  |  |  |  | (6)
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, 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) | (118) |  |  |  |  |  |
Balance, end of period (in shares) at Sep. 30, 2020 |  | 399,000,000 |  |  |  |  |
Balance, end of period at Sep. 30, 2020 | 1,124 | $ 53 | 4,447 | (3,052) | (355) | (282) | 313
Balance, beginning of period (in shares) at Mar. 31, 2020 |  | 399,000,000 |  |  |  |  |
Balance, beginning of period at Mar. 31, 2020 | 1,231 | $ 53 | 4,451 | (2,918) | (365) | (317) | 327
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Comprehensive income (loss) | (97) |  |  | (124) |  | 11 | 16
Stock and other incentive plans (in shares) |  | 0 |  |  |  |  |
APIC, Share-based Payment Arrangement, Increase for Cost Recognition |  |  | (7) |  |  |  |
Stock and other incentive plans | 2 |  |  |  | 9 |  |
Net distributions to noncontrolling interests | (18) |  |  |  |  |  | (18)
Balance, end of period (in shares) at Jun. 30, 2020 |  | 399,000,000 |  |  |  |  |
Balance, end of period at Jun. 30, 2020 | 1,118 | $ 53 | 4,444 | (3,042) | (356) | (306) | 325
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Comprehensive income (loss) | 26 |  |  | (10) |  | 24 | 12
Stock and other incentive plans (in shares) |  | 0 |  |  |  |  |
APIC, Share-based Payment Arrangement, Increase for Cost Recognition |  |  | 3 |  |  |  |
Stock and other incentive plans | 4 |  |  |  | 1 |  |
Net distributions to noncontrolling interests | (24) |  |  |  |  |  | (24)
Balance, end of period (in shares) at Sep. 30, 2020 |  | 399,000,000 |  |  |  |  |
Balance, end of period at Sep. 30, 2020 | $ 1,124 | $ 53 | 4,447 | (3,052) | (355) | (282) | 313
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 |  | 499,000,000 |  |  |  |  |
Balance, end of period at Mar. 31, 2021 | $ 2,719 | $ 63 | 5,487 | (2,948) | (93) | (120) | 330
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) | $ 2,290 |  |  |  |  |  |
Balance, end of period (in shares) at Sep. 30, 2021 | 500,055,941 | 500,000,000 |  |  |  |  |
Balance, end of period at Sep. 30, 2021 | $ 4,290 | $ 63 | 4,887 | (894) | (83) | 23 | 294
Balance, beginning of period (in shares) at Mar. 31, 2021 |  | 499,000,000 |  |  |  |  |
Balance, beginning of period at Mar. 31, 2021 | 2,719 | $ 63 | 5,487 | (2,948) | (93) | (120) | 330
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Comprehensive income (loss) | 849 |  |  | 780 |  | 54 | 15
Stock and other incentive plans (in shares) |  | 1,000,000 |  |  |  |  |
APIC, Share-based Payment Arrangement, Increase for Cost Recognition |  |  | 4 |  |  |  |
Stock and other incentive plans | 10 |  |  |  | 6 |  |
Acquisition of ArcelorMittal USA - Measurement period adjustments | (13) |  |  |  |  |  | (13)
Net distributions to noncontrolling interests | (24) |  |  |  |  |  | (24)
Balance, end of period (in shares) at Jun. 30, 2021 |  | 500,000,000 |  |  |  |  |
Balance, end of period at Jun. 30, 2021 | 3,541 | $ 63 | 5,491 | (2,168) | (87) | (66) | 308
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Comprehensive income (loss) | 1,371 |  |  | 1,274 |  | 89 | 8
Stock and other incentive plans (in shares) |  | 0 |  |  |  |  |
APIC, Share-based Payment Arrangement, Increase for Cost Recognition |  |  | 5 |  |  |  |
Stock and other incentive plans | 9 |  |  |  | 4 |  |
Preferred Stock Redemption Premium | (605) |  | (605) |  |  |  |
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt | (4) |  | (4) |  |  |  |
Net distributions to noncontrolling interests | $ (22) |  |  |  |  |  | (22)
Balance, end of period (in shares) at Sep. 30, 2021 | 500,055,941 | 500,000,000 |  |  |  |  |
Balance, end of period at Sep. 30, 2021 | $ 4,290 | $ 63 | $ 4,887 | $ (894) | $ (83) | $ 23 | $ 294

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- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. 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http://asc.fasb.org/extlink&oid=124434974&loc=SL124442142-165695 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=123454820&loc=SL4568740-111683 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 40 -Section 65 -Paragraph 1 -Subparagraph (e)(3) -URI http://asc.fasb.org/extlink&oid=123482062&loc=SL123482106-238011 Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 45 -Paragraph 5 -Subparagraph (b) -URI 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-URI http://asc.fasb.org/extlink&oid=123459177&loc=SL121830611-158277 Reference 17: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32136-110900 Reference 18: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 65 -Paragraph 8 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=123459177&loc=SL121830611-158277 Reference 19: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 20: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 65 -Paragraph 15 -Subparagraph (f)(2) -URI 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(a)(3)(iii)(03) + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant