CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Millions	Total	Shares Issued [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]
Balance, beginning balance at Dec. 31, 2014	$ 7,033	$ 1	$ 5,411	$ 2,427	$ (881)	$ 75
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Loss	(1,951)	0	0	(1,985)	0	34
Other Comprehensive Loss	(760)	0	0	0	(760)	0
Dividends Paid to Noncontrolling Interests	(48)	0	0	0	0	(48)
Equity Awards Granted, Vested and Exercised	(91)	0	(91)	0	0	0
Balance, ending balance at Dec. 31, 2015	4,365	1	5,502	442	(1,641)	61
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Loss	(3,373)	0	0	(3,392)	0	19
Other Comprehensive Loss	31	0	0	0	31	0
Dividends Paid to Noncontrolling Interests	(24)	0	0	0	0	(24)
Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature	97	0	97	0	0	0
Equity Awards Granted, Vested and Exercised	(78)	0	(78)	0	0	0
Balance, ending balance at Dec. 31, 2016	2,068	1	6,571	(2,950)	(1,610)	56
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stocks, Including Additional Paid in Capital	894	0	894	0	0	0
Warrants and Rights Outstanding	156
Net Loss	(2,793)	0	0	(2,813)	0	20
Other Comprehensive Loss	91				91
Dividends Paid to Noncontrolling Interests	(21)					(21)
Equity Awards Granted, Vested and Exercised	(84)		(84)
Balance, ending balance at Dec. 31, 2017	(571)	$ 1	$ 6,655	$ (5,763)	$ (1,519)	$ 55
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Warrants and Rights Outstanding	$ 70