Stock Option Activity (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2012
Number of Options
Outstanding Beginning Balance	58
Granted	11
Exercised	(4)
Forfeited	(2)
Expired	(6)
Outstanding Ending Balance	57
Vested and expected to vest at December 31, 2012	54
Vested and exercisable at December 31, 2012	31
Weighted-Average Exercise Price per Share
Outstanding Beginning Balance	$ 16.20
Granted	$ 13.51
Exercised	$ 10.81
Forfeited	$ 13.99
Expired	$ 16.80
Outstanding Ending Balance	$ 16.04
Vested and expected to vest at December 31, 2012	$ 16.16
Vested and exercisable at December 31, 2012	$ 17.73
Weighted-Average Remaining Contractual Life (in years)
Outstanding at December 31, 2012	6 years 8 months 12 days
Vested and expected to vest at December 31, 2012	6 years 7 months 2 days
Vested and exercisable at December 31, 2012	5 years 1 month 10 days
Aggregate Intrinsic Value
Outstanding at December 31, 2012	$ 39
Vested and expected to vest at December 31, 2012	36
Vested and exercisable at December 31, 2012	$ 13

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Net number of share options (or share units) granted during the period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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