Discontinued Operations and Held-For-Sale Businesses (Schedule of Disposal Groups, Including Discontinued Operations) (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, 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
Disposal Group, Including Discontinued Operation, Revenue									3,320
Income tax expense							$ 0	$ 2	21
Income (loss) from operations of discontinued businesses, after income tax							0	(9)	(18)
Net loss from disposal and impairments of discontinued businesses, after income tax							1	225	(611)
Disposal Group, Including Discontinued Operation, Costs of Goods Sold									(3,151)
Disposal Group, Including Discontinued Operation, Other Expense	[1]								(166)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax									(608)
Discontinued Operation, Tax Effect of Discontinued Operation									(21)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent							1	218	(654)
Cash Provided by (Used in) Investing Activities, Discontinued Operations									(288)
Asset Impairment Charges							277	355	537
Other Asset Impairment Charges		$ 69	$ 116	$ 42	$ 74	$ 92	$ 185	$ 208	537
Eletropaulo Subsidiary [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net loss from disposal and impairments of discontinued businesses, after income tax						$ 199
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.