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, 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 dividend						(106)				(106)
Issuance of stock, shares		30,000,000	1,725,000
Issuance of stock				$ 1,673	669				$ 1,673	669
Issuance of restricted stock, shares		5,821,125
Cancellation of restricted stock, shares		(103,162)
Treasury stock - non-qualified plan								$ (1)		(1)
Tax withholding - stock compensation, shares		(73,869)
Issuance of stock awards, shares		5,463
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
Net income (loss)						(2,643)				(2,643)
Other comprehensive income (loss)							9			9
Comprehensive income (loss)										(2,634)
Stock-based compensation					58					58
Preferred stock dividend, shares	[1]	7,166,389
Preferred stock dividend	[1]				(27)					(27)
Exercise of stock options, shares		44,880
Issuance of stock, shares		98,900,000
Issuance of stock		$ 1			1,246					1,247
Issuance of restricted stock, shares		87,472
Cancellation of restricted stock, shares		(165,483)
Tax withholding - stock compensation, shares		(929,252)
Tax withholding - stock compensation					(9)					(9)
Issuance of stock awards, shares		5,814
Balance, shares at Dec. 31, 2016		495,248,369	1,725,000
Balance at Dec. 31, 2016		$ 5			$ 4,677	$ (3,725)	$ (39)	$ (1)		$ 917

[1] Does not include 2,751,410 shares issued on January 17, 2017 and distributed to holders of the Company's mandatory convertible preferred stock.