Consolidated Statements Of Stockholders' Equity - USD ($) shares in Thousands, $ in Millions	Total	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Common Stock [Member]	Accumulated Deficit	AOCI Attributable to Parent [Member]
Comprehensive income (loss):
Shares, Issued			(30,500)	(137,100)
Stock Issued During Period, Value, Stock Options Exercised	$ 0	$ (20)	$ (20)
Excess Tax Benefit from Share-based Compensation, Financing Activities	12	(12)
Stock Issued During Period, Value, Employee Stock Purchase Plan	0	(1)	(1)
Stock Issued During Period, Value, Conversion of Convertible Securities	66	529	595
Balance at Dec. 31, 2013	(771)	(7,893)	$ 4,880	$ (1)	$ 2,360	$ 117
Comprehensive income (loss):
Net income	245				245
Other comprehensive income (loss)	$ (139)					(139)
Number of Options - Exercised			100
Stock Issued During Period, Shares, Conversion of Convertible Securities	4,000		4,000
Treasury Stock, Shares, Acquired			5,700
Treasury Stock, Value, Acquired, Cost Method	$ (300)		$ (300)
Balance at Dec. 31, 2014	(665)	(7,212)	4,411	(1)	2,115	22
Comprehensive income (loss):
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	106
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	10	(143)	$ 153
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures			700
Balance at Dec. 31, 2013	$ (771)	(7,893)	$ 4,880	(1)	2,360	117
Comprehensive income (loss):
Treasury Stock, Shares, Acquired	27,000
Treasury Stock, Value, Acquired, Cost Method	$ (1,100)
Balance at Dec. 31, 2016	(221)	(6,918)	$ 4,905	$ (1)	1,639	154
Comprehensive income (loss):
Shares, Issued			(31,400)	(137,100)
Stock Issued During Period, Value, Stock Options Exercised	0	(3)	$ (3)
Excess Tax Benefit from Share-based Compensation, Financing Activities	7	7
Stock Issued During Period, Value, Employee Stock Purchase Plan	0	1	(1)
Balance at Dec. 31, 2014	(665)	(7,212)	$ 4,411	$ (1)	2,115	22
Comprehensive income (loss):
Net income	313				313
Other comprehensive income (loss)	(125)					(125)
Number of Options - Exercised			0
Treasury Stock, Shares, Acquired			8,800
Treasury Stock, Value, Acquired, Cost Method	(394)		$ (394)
Balance at Dec. 31, 2015	(439)	(7,010)	4,623	$ (1)	1,802	147
Comprehensive income (loss):
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	188
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	(13)	(191)	$ 178
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures			900
Shares, Issued			(39,300)	(137,100)
Stock Issued During Period, Value, Stock Options Exercised	0	(2)	$ (2)
Excess Tax Benefit from Share-based Compensation, Financing Activities	5	5
Stock Issued During Period, Value, Employee Stock Purchase Plan	(1)	1	$ (2)
Net income	163
Other comprehensive income (loss)	$ (7)					(7)
Number of Options - Exercised	17		0
Treasury Stock, Shares, Acquired			12,300
Treasury Stock, Value, Acquired, Cost Method	$ (390)		$ (390)
Balance at Dec. 31, 2016	(221)	(6,918)	4,905	$ (1)	$ 1,639	$ 154
Comprehensive income (loss):
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	156
Stockholders' Equity Attributable to Noncontrolling Interest	5
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	$ 15	$ (89)	$ 104
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures			500
Shares, Issued			(51,100)	(137,100)