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Stock-Based Compensation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended				1 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Non-employee	Sep. 30, 2012 Stock options	Feb. 21, 2012 Restricted stock and restricted stock units	Sep. 30, 2012 Restricted stock and restricted stock units	Sep. 30, 2012 Performance-base restricted stock	Sep. 30, 2012 Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Earlier authorized shares under stock based compensation			25,500,000
Remaining shares available for future grants under the Plan	3,563,803		3,563,803
Total stock-based compensation compensation arrangements under the Plan	$ 23	$ 19	$ 57	$ 55					$ 8
Total income tax benefit stock-based compensation arrangements under the Plan	$ 6	$ 6	$ 17	$ 17
Stock option granted						2,239,088
Restricted stock granted					18,158		464,270	482,428	148,550
Stock option granted, exercise price						$ 84.58
Performance based restricted stock awards granted in percent			100.00%
Performance based restricted stock awards vested, number of months			36 months
Period of Restricted stock awards vested over grant date										Restricted stock awards vest on the third anniversary of the date of grant

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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 on stock options awarded.

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