CONSOLIDATED STATEMENT OF CHANGES IN EQUITY - USD ($) $ in Millions	Common Stock [Member]	Preferred Stock [Member] Series B Preferred Stock [Member]	Additional Paid-in Capital [Member] Series B Preferred Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Common Stock in Treasury [Member]	Series B Preferred Stock [Member]	Total
Balance, shares at Dec. 31, 2012	351,100,391
Balance at Dec. 31, 2012	$ 4			$ 934	$ 1,949	$ 150	$ (1)		$ 3,036
Comprehensive income (loss):
Net income (loss)					704				704
Other comprehensive income (loss)						(154)			(154)
Comprehensive income (loss)									550
Stock-based compensation				25					25
Exercise of stock options, shares	833,132
Exercise of stock options				10					10
Issuance of restricted stock, shares	1,102,926
Cancellation of restricted stock, shares	(74,083)
Tax withholding - stock compensation, shares	(25,131)
Tax withholding - stock compensation				(1)					(1)
Issuance of stock awards, shares	1,349
Treasury stock - non-qualified plan				1			1		2
Balance, shares at Dec. 31, 2013	352,938,584
Balance at Dec. 31, 2013	$ 4			969	2,653	(4)			3,622
Comprehensive income (loss):
Net income (loss)					924				924
Other comprehensive income (loss)						66			66
Comprehensive income (loss)									990
Stock-based compensation				38					38
Exercise of stock options, shares	402,190
Exercise of stock options				12					12
Issuance of restricted stock, shares	1,299,367
Cancellation of restricted stock, shares	(140,703)
Tax withholding - stock compensation, shares	(12,133)
Issuance of stock awards, shares	1,687
Balance, shares at Dec. 31, 2014	354,488,992
Balance at Dec. 31, 2014	$ 4			1,019	3,577	62			4,662
Comprehensive income (loss):
Net income (loss)					(4,556)				(4,556)
Other comprehensive income (loss)						(110)			(110)
Comprehensive income (loss)									(4,666)
Stock-based compensation				48					48
Preferred stock dividends					(106)				(106)
Issuance of restricted stock, shares	5,821,125
Cancellation of restricted stock, shares	(103,162)
Issuance of stock, shares	30,000,000	1,725,000
Issuance of stock			$ 1,673	669				$ 1,673	669
Tax withholding - stock compensation, shares	(73,869)
Issuance of stock awards, shares	5,463
Treasury stock - non-qualified plan							(1)		(1)
Balance, shares at Dec. 31, 2015	390,138,549	1,725,000
Balance at Dec. 31, 2015	$ 4			$ 3,409	(1,082)	$ (48)	$ (1)		2,282
Comprehensive income (loss):
Non-controlling interest					$ 3				$ 3