Calculations for Basic and Diluted Earnings Per Share (Detail) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Numerator:
Net income (loss)-basic and diluted	$ 32	$ (50)	$ 118	$ 11
Denominator:
Weighted-average common shares outstanding	162,425	163,069	162,351	163,005
Adjusted weighted-average shares	163,514	163,069	163,328	163,685
Earnings (loss) per share:
Basic	$ 0.20	$ (0.31)	$ 0.73	$ 0.07
Diluted	$ 0.20	$ (0.31)	$ 0.72	$ 0.07
Number of anti-dilutive stock-based awards	6,059	7,858	6,072	7,853
Nonvested shares
Denominator:
Effect of stock-based awards	670		602	512
Stock Options
Denominator:
Effect of stock-based awards	419		375	168

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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