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Date unrecognized compensation cost, net of forfeitures, related to outstanding stock options, restricted stock awards, and restricted stock units is expected to be recognized through.

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- Definition

Period from the date of grant in which stock options expire

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- Definition

Aggregate number of common shares reserved for future issuance.

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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

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The amount of the cost recognized during the period for defined contribution plans.

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Employee Incentive, Retirement, and Deferred Compensation Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Shares of common stock authorized to be granted under the existing stock incentive plan	45
Total unrecognized compensation cost, net of forfeitures, related to outstanding stock options, restricted stock awards, and restricted stock units	$ 191
Total unrecognized compensation cost, net of forfeitures, related to outstanding stock options, restricted stock awards, and restricted stock units, recognition period (year)	2016
Remaining weighted-average period for unrecognized compensation cost, net of forfeitures, related to outstanding stock options, restricted stock awards, and restricted stock units	2 years 9 months 18 days
Deferred compensation liability	127	128
Stock Option \| Minimum
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Period from the date of grant in which stock options expire	7 years
Award Vesting Period	3 years
Stock Option \| Maximum
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Period from the date of grant in which stock options expire	10 years
Award Vesting Period	5 years
Restricted Stock
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Total fair value of restricted stock awards vested	30	13	6
Restricted Stock \| Minimum
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Award Vesting Period	3 years
Restricted Stock \| Maximum
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Award Vesting Period	5 years
Employee Stock Purchase Plan
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Shares reserved for future issuance under the ESPP	43
Retirement Plan
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Company's total contribution expense	$ 59	$ 53	$ 50