Debt (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified				6 Months Ended		6 Months Ended		1 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Apr. 17, 2014	Dec. 31, 2013	Jun. 30, 2014 Credit Facility [Member]	Jun. 30, 2014	Jun. 30, 2014 Oman Credit Facilities [Member]	Dec. 31, 2013 Oman Credit Facilities [Member]	Apr. 30, 2014 Ten Percent Convertible Senior Notes due Two Thousand Eighteen [Member]	Dec. 31, 2013 Ten Percent Convertible Senior Notes due Two Thousand Eighteen [Member]	Jun. 30, 2014 Ten Percent Convertible Senior Notes due Two Thousand Eighteen [Member]	Mar. 31, 2014 Ten Percent Convertible Senior Notes due Two Thousand Eighteen [Member]	Jun. 30, 2014 Nine Point Seven Five Percent Senior Notes due Two Thousand Fourteen Net of Discount [Member]	Dec. 31, 2013 Nine Point Seven Five Percent Senior Notes due Two Thousand Fourteen Net of Discount [Member]
Debt Instrument [Line Items]
Gross long term debt											$ 75
Interest rate of convertible senior notes	10.00%								10.00%	10.00%		9.75%	9.75%
Amount of minimum liquidity condition		500
Long-term debt	2,270		2,355				11		72	0	72	59	59
Unamortized discount											3
Debt conversion, original amount of debt								75	325	75
Debt conversion, shares issued for converted instrument								6,578,946	28,500,000
Required minimum fixed charge coverage ratio per credit agreement covenant				1.1
Aggregate principal amount				40
Line of credit facility rate applied aggregate revolving commitments activating fixed charge coverage ratio covenants				15.00%
Actual fixed charge coverage ratio				1.22
Amount of letters of credit outstanding				70
Borrowing available under credit facility				227	37
Outstanding lines of credit				0	0
Line of credit facility increase in borrowing						3
Fair value of debt	$ 2,467		$ 2,659