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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- Definition

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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- Definition

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

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

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

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Weighted average grant-date fair value of options vested.

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Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 5	$ 0	$ 14	$ 14
Income tax benefit	(2)	0	(5)	(5)
Total	3	$ 0	9	$ 9
Compensation cost not yet recognized	$ 61		$ 61
Period for recognition			2 years
Stock Incentive Plan and Omnibus Plan \| Equity Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period, net of forfeitures			3,263,654
Weighted average grant date fair value			$ 7.34
Stock Incentive Plan and Omnibus Plan \| Equity Option \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			3 years
Stock Incentive Plan and Omnibus Plan \| Equity Option \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			5 years
Stock Incentive Plan and Omnibus Plan \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period, net of forfeitures			855,305
Weighted average grant date fair value			$ 20.95
Stock Incentive Plan and Omnibus Plan \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period, net of forfeitures			1,375,885
Weighted average grant date fair value			$ 21.22