Calculations for Basic and Diluted Earnings Per Share (Detail) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Numerator:
Net income-basic and diluted	$ 111	$ 19	$ 229	$ 30
Denominator:
Weighted-average common shares outstanding	162,555	162,538	162,419	162,848
Adjusted weighted-average shares	163,857	163,086	163,507	163,465
Earnings per share:
Basic	$ 0.69	$ 0.12	$ 1.41	$ 0.19
Diluted	$ 0.68	$ 0.12	$ 1.40	$ 0.19
Number of anti-dilutive stock-based awards	5,045	8,590	6,000	7,790
Nonvested shares
Denominator:
Effect of stock-based awards	739	542	647	522
Stock Options
Denominator:
Effect of stock-based awards	563	6	441	95

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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