Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share) (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ (28)		$ 79		$ (74)		$ 56
Interest on Convertible Debt, Net of Tax	0		1		0		3
Net Income (Loss) Available to Common Stockholders, Diluted	$ (28)		$ 80		$ (74)		$ 59
Weighted Average Number of Shares Outstanding, Basic	108.4		106.7		108.0		106.3
Weighted Average Number Diluted Shares Outstanding Adjustment	0	[1],[2]	1.8	[1],[2]	0	[1],[2]	1.9	[1],[2]
Incremental Common Shares Attributable to Conversion of Debt Securities	0	[3]	13.4	[3]	0	[3]	16.6	[3]
Weighted Average Number of Shares Outstanding, Diluted	108.4		121.9		108.0		124.8
Basic (US$ per share)	$ (0.26)		$ 0.74		$ (0.69)		$ 0.52
Diluted (US$ per share)	$ (0.26)		$ 0.66		$ (0.69)		$ 0.47
Warrants [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Anti-dilutive shares					4.6		8.9
Shares Underlying 3 1/2% Convertible Notes [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Anti-dilutive shares					4.6
Restricted Stock Units (RSUs) [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Anti-dilutive shares					3.5		1.2
Options [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Anti-dilutive shares					1.2		0.2

[1] As the Company incurred a net loss for the three and six months ended June 30, 2013, 1.2 million outstanding options, 4.6 million warrants and 3.5 million non-vested stock awards have an anti-dilutive effect and therefore are excluded from the computation of diluted weighted average shares outstanding.

[2] For the three and six months ended June 30, 2012, 0.2 million outstanding options, 8.9 million warrants and 1.2 million non-vested stock awards have an anti-dilutive effect and therefore are excluded from the computation of diluted weighted average shares outstanding.

[3] As the Company incurred a net loss for the three and six months ended June 30, 2013, 4.6 million issuable shares underlying the 3½% convertible notes due 2014 have an anti-dilutive effect and therefore are excluded from the computation of diluted weighted average shares outstanding.