CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (USD $) In Millions, except Share data, unless otherwise specified	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Comprehensive Income (Loss) [Member]	Common Stock In Treasury [Member]	Total
Balance at Dec. 31, 2011	$ 4	$ 903	$ 2,656	$ 408	$ (2)	$ 3,969
Balance, shares at Dec. 31, 2011	349,058,501
Comprehensive income:
Net income (loss)			(707)			(707)
Other comprehensive income (loss)				(258)		(258)
Comprehensive income (loss)						(965)
Stock-based compensation		22				22
Exercise of stock options		9				9
Exercise of stock options, shares	1,607,784					1,608,000
Issuance of restricted stock, shares	539,542
Cancellation of restricted stock, shares	(95,302)
Tax withholding - stock compensation, shares	(11,357)
Issuance of stock awards, shares	1,223
Treasury stock - non-qualified plan					1	1
Balance at Dec. 31, 2012	4	934	1,949	150	(1)	3,036
Balance, shares at Dec. 31, 2012	351,100,391
Comprehensive income:
Net income (loss)			704			704
Other comprehensive income (loss)				(154)		(154)
Comprehensive income (loss)						550
Stock-based compensation		25				25
Exercise of stock options		10				10
Exercise of stock options, shares	833,132					833,000
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 at Dec. 31, 2013	4	969	2,653	(4)		3,622
Balance, shares at Dec. 31, 2013	352,938,584
Comprehensive income:
Net income (loss)			924			924
Other comprehensive income (loss)				66		66
Comprehensive income (loss)						990
Stock-based compensation		38				38
Exercise of stock options		12				12
Exercise of stock options, shares	402,190					402,000
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 at Dec. 31, 2014	$ 4	$ 1,019	$ 3,577	$ 62		$ 4,662
Balance, shares at Dec. 31, 2014	354,488,992