Discontinued Operations and Held-For-Sale Businesses (Schedule of Disposal Groups, Including Discontinued Operations) (Details) - USD ($) $ in Millions			1 Months Ended	3 Months Ended						12 Months Ended
		Oct. 31, 2016	Jun. 30, 2016	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
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		$ 529
Disposal Group, Including Discontinued Operation, Revenue											3,320		4,036
Income tax expense										$ 2	21		(229)
Income (loss) from operations of discontinued businesses, after income tax										(9)	(18)		151
Net loss from disposal and impairments of discontinued businesses, after income tax										225	(611)		(1,119)
Disposal Group, Including Discontinued Operation, Assets							$ 2,034				2,034
Disposal Group, Including Discontinued Operation, Liabilities							1,033				1,033
Disposal Group, Including Discontinued Operation, Costs of Goods Sold											(3,151)		(3,954)
Disposal Group, Including Discontinued Operation, Other Expense											(166)	[1]	(160)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax											(608)		(1,463)
Discontinued Operation, Tax Effect of Discontinued Operation											(21)		495
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent										218	(654)		(1,110)
Cash Provided by (Used in) Investing Activities, Discontinued Operations											(288)		(368)
Asset Impairment Charges										355	537		1,098
Other Asset Impairment Charges				$ 42	$ 74	$ 92	277	$ 90	$ 168	$ 208	537		1,096
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
Disposal Group, Including Discontinued Operations, Investments in and Advances to Affiliates	[2]						86				86
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax											(633)		(192)
Sul 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		$ 737	$ 382										1,100
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax													$ (1,400)
Discontinued Operations [Member] | Eletropaulo Subsidiary [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Assets							86				86
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Assets	[3]						1,948				1,948
Disposal Group, Including Discontinued Operation, Liabilities	[3]						$ 1,033				$ 1,033
Discontinued Operations, Held-for-sale [Member] | Sul Subsidiary [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other Asset Impairment Charges			$ 783

[1] Includes a loss contingency recognized by our equity method investment in discontinued operations.

[2] Represents the Company's 17% ownership interest in Eletropaulo

[3] Masinloc, Eletrica Santiago, and the DPL peaker assets were classified as held-for-sale as of December 31, 2017. See Note 23—Held-for-Sale and Dispositions for further information.