The maximum level of performance achieved which will determine the number of performance shares that will vest.

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Percentage of shares awarded fore market performance in excess of target

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Share based compensation arrangement by share based payment award annual forfeiture rate - minimum

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Share based compensation arrangement by share based payment award annual vesting percentage.

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Target Percentage of Shares Awarded Based on Expected Market Performance

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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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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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, 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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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).

+ References

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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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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

-Subsection 2

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The range of expected volatilities used and the weighted-average expected volatility for an entity using a valuation technique with different volatilities during the contractual term.

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Description of the method used for calculating compensation cost for the award under the plan.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options outstanding.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Stock-Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awarded during the period	468,323	463,885	481,326
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	6
Weighted average recognition period, in years	1 year 1 month 25 days
Aggregate market value of the shares released and issued on the vesting dates	19
Performance-Based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period	3 years
Expected life of option (years)	3 years	3 years	3 years
Stock awarded during the period	216,188
Weighted average stock price volatility	27.80%
Risk-free interest rate	0.40%	1.00%	1.40%
Performance-Based Restricted Stock [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Level of performance achieved based on shares awarded, minimum	0.00%
Performance-Based Restricted Stock [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Level of performance achieved based on shares awarded, maximum	200.00%
Non-Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	1
Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sharebased Compensation Arrangement By Sharebased Payment Award Expiration Period	10 years
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years) for shares awarded	6 years
Vesting percentage of options granted	20.00%
Aggregate intrinsic value of options outstanding	40
Aggregate intrinsic value of options exercised	27	15	24
Cash received from exercise of stock options	15
Aggregate intrinsic value for outstanding stock options fully vested or expected to vest	40
Weighted average remaining contractual life for outstanding stock options vested or expected to vest (in years)	3 years 8 months 12 days
Aggregate intrinsic value for outstanding stock options exercisable	33
Weighted average remaining contractual life for outstanding stock options exercisable (in years)	3 years 4 months 24 days
Unrecognized compensation cost	2
Weighted average recognition period, in years	0 years 9 months 29 days
Weighted average grant-date fair values for options granted during period	14.98	10.14
Expected life of option (years)		6 years 9 months 18 days	6 years
Risk-free interest rate		2.40%	2.60%
Allocated Share-based Compensation Expense	5	5	5
Share-based Compensation Arrangement by Share-based Payment Award, Method of Measuring Cost of Award	Black-Scholes option pricing model
Stock Options [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual forfeiture rate	3.00%
Stock Options [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual forfeiture rate	5.00%
Performance-Based-Achieved [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Additional Shares Released Target Exceeded	125,552
Percentage of shares awarded on market performance target (as a percent)	100.00%
Percentage of shares awarded on market performance in excess of target (as a percent)	49.00%
Time-Vested Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years) for shares awarded	3 years
Stock awarded during the period	126,582
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	12	12	14
2006 Stock-based Incentive Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grant or awards	1,600,000