Stock-Based Compensation (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Shares of common stock available for grants	23.2
Stock-based compensation costs	$ 67	$ 48	$ 52
Deferred income tax benefits on stock-based compensation	20	15	19
Weighted-average fair value of options granted	$ 0	$ 0	$ 0
Excess tax benefits	50	15	6
Total fair value of restricted shares and restricted share units	$ 101	$ 28	$ 31
Stock Options [Member]
Stock options term, years	10
Vesting percentage at the end of each of the first two 12 months period	30.00%
Vesting percentage at the end of third 12 months period	40.00%
General vesting period	three or four years
Restricted Shares, Time-vested Restricted Share Units and Performance-Based Restricted Share Units [Member]
General vesting period	three
Performance-Based Share Units [Member]
Ultimately vested units range, minimum	0.00%
Ultimately vested units range, maximum	200.00%

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Share Based Compensation Arrangement By Share Based Payment Award Vesting Percentage Year Three

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from equity-based compensation costs, which can only be deducted for tax purposes when actual costs are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.

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Reductions in the entity's income taxes that arise when compensation cost (from non-qualified share-based compensation) recognized on the entity's tax return exceeds compensation cost from equity-based compensation recognized in financial statements. This element represents the cash inflow reported in the enterprise's financing activities.

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Description of the period of time over 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, which may be expressed in a variety of ways (for example, in years, month and year).

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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 difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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