Annual report pursuant to Section 13 and 15(d)

SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION - Discontinued Operation (Details)

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SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION - Discontinued Operation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Income (loss) from discontinued operations, net of tax $ 1 $ (2) $ 88
Operating income (loss) (142) 429 673
Foreign Currency Transaction Gain (Loss), Realized $ 0 $ 0 228
Asia Pacific Iron Ore [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Operating income (loss)     (105)
Foreign Currency Transaction Gain (Loss), Realized     $ 228