Share-Based Compensation (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation cost	$ 24	$ 23
Maximum term for non-qualified and incentive stock options, in years	10
Proceeds from the exercise of stock options	16	64
Total intrinsic value of options exercised	15	62
Years of historical volatility included in cost recent volatility	15
Incentive Stock Plans contractual lives, minimum, years	5.7	5.1
Incentive Stock Plans contractual lives, maximum, years	7.1	6.7
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercisable period from date of grant, in years	5
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercisable period from date of grant, in years	1
Time-Based Restricted Stock And Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	10	9
Unrecognized compensation cost	39
Weighted-average period to recognize the cost, in years	1.9
Performance-Based Restricted Stock And Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	2	2
Options vesting period, years	3 years
Incentive Stock Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Stock Plans vest over a period, minimum, years	1
Incentive Stock Plans vest over a period, maximum, years	10
Incentive Stock Plans contractual lives, minimum, years	1
Incentive Stock Plans contractual lives, maximum, years	10
Expected term for grants under Incentive Stock Plans, minimum, years	1
Expected term for grants under Incentive Stock Plans, maximum, years	10
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	12	12
Unrecognized compensation cost	$ 50
Weighted-average period to recognize the cost, in years	2

Expected Term For Grants Incentive Stock Plans Maximum

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Expected Term For Grants Incentive Stock Plans Minimum

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Incentive Stock Plan Vest Over A Period Maximum

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Incentive Stock Plan Vest Over A Period Minimum

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Maximum term in years for non-qualified and incentive stock options

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Stock options exercisable period from date of grant.

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Years of Historical Volatility Included in Most Recent Volatility

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- Definition

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.

+ References

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The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

+ References

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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- Definition

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).

+ References

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- Definition

Equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset.

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The maximum period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

+ References

No definition available.

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The minimum period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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- Definition

The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

+ References

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