Income Taxes (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2017
(Provision) Benefit for Income Taxes	$ (17,000,000)	$ 102,000,000	$ (50,000,000)	$ 203,000,000
Income (loss) before income taxes	(148,000,000)	(664,000,000)	(558,000,000)	(1,256,000,000)
Bond Tender Premium	0	(78,000,000)	0	(78,000,000)
Financing Receivable, Allowance for Credit Losses, Write-downs		84,000,000		84,000,000
Foreign exchange related charges	$ 0	0	$ 0	31,000,000
Forecast
Uncertain tax positions, estimated for next twelve months					$ 10,000,000
Iraq
Loss on contracts		52,000,000
SEC Settlement
Gain (loss) related to litigation settlement		$ (75,000,000)		$ (140,000,000)