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Share based compensation arrangements by share based payment award equity instrument other than options nonvested aggregate intrinsic value

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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 amount of expense, net of income tax, 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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Unrecognized cost of unvested share-based compensation awards.

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

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Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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The weighted average fair value at grant date for nonvested equity-based awards issued 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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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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Weighted average remaining contractual term for equity-based awards excluding options, 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 equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan 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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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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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Net number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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

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For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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Number of share options (or share units) exercised during the current period.

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Stock Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Stock-based compensation expense
Total stock-based compensation expense	$ 11	$ 10	$ 22	$ 19
Income tax benefit recognized in the income statement	(4)	(3)	(8)	(6)
Stock-based compensation expense, net of tax	7	7	14	13
Stock option activity
Stock options - beginning balance outstanding			2,031,833
Stock options - beginning balance outstanding, weighted average exercise price			$ 37.59
Stock options - weighted average remaining contractual term			8 years 4 months 6 days		7 years 7 months 24 days
Stock options - beginning balance outstanding, aggregate intrinsic value			23
Stock options - granted			667,139
Stock options - granted, weighted average excercise price			$ 51.68
Stock options - exercised			(802,729)
Stock options - exercised, wighted average exercise price			$ 34.81
Stock options - exercised, total intrinsic value			14
Stock options - forfeited or expired			0
Stock options, forfeited or expired, weighted average exercise price			$ 0.00
Stock options - ending balance outstanding	1,896,243		1,896,243		2,031,833
Stock options - ending balance outstanding, weighted average exercise price	$ 43.72		$ 43.72		$ 37.59
Stock options - weighted average remaining contractual term			8 years 4 months 6 days		7 years 7 months 24 days
Stock options - ending balance outstanding, aggregate intrinsic value	28		28		23
Stock options - exercisable	639,671		639,671
Stock options - exercisable, weighted average exercise price	$ 37.53		$ 37.53
Stock options- exercisable, weighted average remaining contractual term			7 years 1 month 6 days
Stock options - exercisable, intrinsic value	13		13
Unrecognized compensation costs related to nonvested awards
Tax withholdings related to net share settlements of certain stock awards			16	12
Employee Stock Option [Member]
Unrecognized compensation costs related to nonvested awards
Unrecognized compensation costs related to nonvested awards	7		7
Weighted average recognition period of unrecognized compensation costs			1 year 4 months 2 days
Restricted Stock [Member]
Restricted Stock Units and Performance Stock Units Activity
RSUs and PSUs - beginning balance outstanding			2,139,143
RSUs and PSUs - beginning balance outstanding, weighted average grant date total fair value			$ 39.15
RSUs and PSUs - beginning balance outstanding, weighted average remaining contractual term			1 year 6 months 25 days		1 year 1 month 13 days
RSUs and PSUs - beginning balance outstanding, agregate intrinsic value			104
RSUs and PSUs - granted			583,303
RSUs and PSUs - granted, weighted average grant date fair value			$ 51.68
RSUs and PSUs - vested and released			(722,821)
RSUs and PSUs - vested and released, weighted average grant date fair value			$ 36.49
RSUs and PSUs - Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value			38
RSUs and PSUs - forfeited			(39,701)
RSUs and PSUs - forfeited, weighted average grant date fair value			$ 42.57
RSUs and PSUs - ending balance outstanding	1,959,924		1,959,924		2,139,143
RSUs and PSUs - ending balance outstanding, weighted average grant date total fair value	$ 43.79		$ 43.79		$ 39.15
RSUs and PSUs - ending balance outstanding, weighted average remaining contractual term			1 year 6 months 25 days		1 year 1 month 13 days
RSUs and PSUs - ending balance outstanding, agregate intrinsic value	115		115		104
Unrecognized compensation costs related to nonvested awards
Unrecognized compensation costs related to nonvested awards	49		49
Weighted average recognition period of unrecognized compensation costs			1 year 6 months 18 days
Tax withholdings related to net share settlements of certain stock awards, shares			237,085
Tax withholdings related to net share settlements of certain stock awards			14
Performance Shares [Member]
Restricted Stock Units and Performance Stock Units Activity
RSUs and PSUs - beginning balance outstanding			422,866
RSUs and PSUs - beginning balance outstanding, weighted average grant date total fair value			$ 39.88
RSUs and PSUs - beginning balance outstanding, weighted average remaining contractual term			1 year 6 months 22 days		1 year 3 months 4 days
RSUs and PSUs - beginning balance outstanding, agregate intrinsic value			21
RSUs and PSUs - granted			149,727
RSUs and PSUs - granted, weighted average grant date fair value			$ 51.68
RSUs and PSUs - vested and released			(104,165)
RSUs and PSUs - vested and released, weighted average grant date fair value			$ 36.42
RSUs and PSUs - Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value			5
RSUs and PSUs - forfeited			(23,014)
RSUs and PSUs - forfeited, weighted average grant date fair value			$ 36.42
RSUs and PSUs - ending balance outstanding	445,414		445,414		422,866
RSUs and PSUs - ending balance outstanding, weighted average grant date total fair value	$ 44.83		$ 44.83		$ 39.88
RSUs and PSUs - ending balance outstanding, weighted average remaining contractual term			1 year 6 months 22 days		1 year 3 months 4 days
RSUs and PSUs - ending balance outstanding, agregate intrinsic value	26		26		21
Unrecognized compensation costs related to nonvested awards
Unrecognized compensation costs related to nonvested awards	13		13
Weighted average recognition period of unrecognized compensation costs			1 year 6 months 25 days
Tax withholdings related to net share settlements of certain stock awards, shares			30,944
Tax withholdings related to net share settlements of certain stock awards			$ 2