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Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share) (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Basic earnings per share: [Abstract]
Net income (loss)	$ (72)	$ (78)
Less: Undistributed earnings allocated to participating securities	0	0
Net income (loss) available to common stockholders	$ (72)	$ (78)
Basic weighted average shares	131,402,465	135,814,835
Basic	$ (0.55)	$ (0.58)
Diluted earnings per share: [Abstract]
Net income (loss)	$ (72)	$ (78)
Less: Undistributed earnings allocated to participating securities	0	0
Net income (loss) available to common stockholders	$ (72)	$ (78)
Basic weighted average shares	131,402,465	135,814,835
Stock options	0	0
Warants	0	0
Diluted weighted average shares	131,402,465	135,814,835
Diluted	$ (0.55)	$ (0.58)
Unvested Restricted Stock And Units That Receive Nonforfeitable Dividends Or Dividend Equivalents That Have Met Service Condition	300,000	700,000

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Unvested Restricted Stock And Units That Receive Nonforfeitable Dividends Or Dividend Equivalents That Have Met Service Condition

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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