Percent, prior to disposal, of ownership interest of a discontinued operation in which an equity method investment is retained.

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Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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Amount after tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
Discontinued Operations (Details) - USD ($) $ in Millions	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	$ 0	$ 3		$ 1	$ 199
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 Prior to Disposal			17.00%
Proceeds from Divestiture of Businesses			$ 340
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax			199
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax			$ 243