Discontinued Operations and Held-For-Sale Businesses (Schedule of Disposal Groups, Including Discontinued Operations) (Details) - USD ($)		1 Months Ended	3 Months Ended								10 Months Ended	12 Months Ended
		Jun. 30, 2016	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Dec. 31, 2016	Oct. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Sep. 30, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Allowance for Doubtful Accounts							$ 8,000,000							$ 8,000,000
Disposal Group, Including Discontinued Operation, Revenue															$ 1,255,000,000
Income tax expense												$ (9,000,000)		(7,000,000)	71,000,000
Income (loss) from operations of discontinued businesses, after income tax												(19,000,000)		(25,000,000)	111,000,000
Net loss from disposal and impairments of discontinued businesses, after income tax												(1,119,000,000)		0	(55,000,000)
Disposal Group, Including Discontinued Operation, Assets							1,306,000,000						$ 0	1,306,000,000
Disposal Group, Including Discontinued Operation, Liabilities	[1]						784,000,000							784,000,000
Disposal Group, Including Discontinued Operation, Costs of Goods Sold															(1,078,000,000)
Impairment Expense Pre Tax Total			$ (625,000,000)	$ (79,000,000)	$ (235,000,000)	$ (159,000,000)	(326,000,000)	$ (231,000,000)	$ (37,000,000)	$ (8,000,000)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax															131,000,000
Discontinued Operation, Tax Effect of Discontinued Operation															(75,000,000)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent												(1,138,000,000)		(25,000,000)	64,000,000
Asset Impairment Charges												1,098,000,000		602,000,000	383,000,000
Sul Subsidiary [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash Provided by (Used in) Operating Activities, Discontinued Operations												58,000,000		(15,000,000)	15,000,000
Disposal Group, Including Discontinued Operation, Revenue												701,000,000		808,000,000
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents							5,000,000							5,000,000
Net loss from disposal and impairments of discontinued businesses, after income tax		$ (382,000,000)											$ (737,000,000)
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net							171,000,000							171,000,000
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment							668,000,000							668,000,000
Disposal Group, Including Discontinued Operation, Deferred Tax Assets							133,000,000							133,000,000
Disposal Group, Including Discontinued Operation, Other Assets							233,000,000							233,000,000
Disposal Group, Including Discontinued Operation, Accounts Payable							150,000,000							150,000,000
Disposal Group, Including Discontinued Operation, Accrued Liabilities							150,000,000							150,000,000
Non Recourse Debt Held For Sale Or Discontinued Operations							346,000,000							346,000,000
Disposal Group, Including Discontinued Operation, Other Liabilities							125,000,000							125,000,000
Disposal Group, Including Discontinued Operation, Costs of Goods Sold												(672,000,000)		(800,000,000)
Disposal Group, Including Discontinued Operation, Other Expense												(57,000,000)		(40,000,000)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax												(1,413,000,000)		(32,000,000)	133,000,000
Discontinued Operation, Tax Effect of Discontinued Operation												275,000,000		7,000,000
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent												(1,138,000,000)		(25,000,000)
Cash Provided by (Used in) Investing Activities, Discontinued Operations												$ (54,000,000)		(25,000,000)	$ (123,000,000)
Discontinued Operations [Member] | Sul Subsidiary [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Assets							1,210,000,000							1,210,000,000
Disposal Group, Including Discontinued Operation, Liabilities							771,000,000							771,000,000
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	[2]						96,000,000							96,000,000
Disposal Group, Including Discontinued Operation, Liabilities	[2]						$ 13,000,000							$ 13,000,000
Sonel
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Divestiture Of Ownership In Subsidiary Percent																56.00%
Cameroon
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset Impairment Charges											$ 101,000,000

[1] Amounts were classified as both current and long-term on the Consolidated Balance Sheet as of December 31, 2015.

[2] DPLER and Kelanitissa were classified as held-for-sale as of December 31, 2015. See Note 23—Dispositions for further information.