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Discontinued Operations and Held-For-Sale Businesses (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended						12 Months Ended
		Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash Provided by (Used in) Operating Activities, Discontinued Operations										$ 164
Cash Provided by (Used in) Investing Activities, Discontinued Operations										(288)
Disposal Group, Including Discontinued Operation, Revenue										3,320
Disposal Group, Including Discontinued Operation, Costs of Goods Sold										(3,151)
Asset Impairment Charges								$ 277	$ 355	537
Net loss from disposal and impairments of discontinued operations								(1)	(225)	611
Other Asset Impairment Charges		$ 69	$ 116	$ 42	$ 74	$ 92		185	208	537
Income (Loss) from Continuing Operations Attributable to Parent								(302)	(985)	507
Impairment Expense Pre Tax Total										(611)
Disposal Group, Including Discontinued Operation, Other Expense	[1]									(166)
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax										3
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax										(608)
Income (loss) on discontinued operations, before tax, attributable to Noncontrolling interest										(25)
Income (loss) from discontinued operations, before income tax, attributable to parent										(633)
Discontinued Operation, Tax Effect of Discontinued Operation										(21)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent								$ 1	$ 218	(654)
Borsod [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation Deferred Gain on Disposal				26
Disposal Group, Including Discontinued Operation, Foreign Currency Translation Gains (Losses)				$ 20
Eletropaulo Subsidiary [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Equity Method Investment Retained after Disposal, Ownership Interest after Disposal							17.00%
Deconsolidation, Gain (Loss), Amount										(611)
Proceeds from divestiture of business						340
Net loss from disposal and impairments of discontinued operations						(199)
Disposal Group, Including Discontinued Operation, Foreign Currency Translation Gains (Losses)										(455)
Disposal Group, Including Discontinued Operation, Pension Gains (Losses)										(243)
Impairment Expense Pre Tax Total						$ 243
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax										$ (633)
[1] Includes a loss contingency recognized by our equity method investment in discontinued operations.

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