Unrecognized cost of unvested share-based compensation awards.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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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 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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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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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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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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.

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

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No definition available.

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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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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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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 price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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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Percentage of vesting of share-based compensation awards.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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

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Share Based Compensation Arrangements by Share-based Payment Award Adjustment For Performance Share Units

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Share-Based Incentive Compensation Plans - Awards Outstanding under Stock Option Plans by Award Type (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restricted Share Units (RSUs)
Number of Awards
Outstanding, beginning balance	3.3
Granted	1.4
Vested	(1.6)
Forfeited	(0.1)
Outstanding, ending balance	3.0	3.3
Awards expected to vest	3.0
Weighted Average Grant Date Fair Value (usd per award)
Outstanding, beginning balance	$ 35.02
Granted	42.30
Vested	34.86
Forfeited	36.86
Outstanding, ending balance	38.42	$ 35.02
Awards expected to vest	$ 38.42
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Unrecognized compensation cost	$ 34
Expected weighted average	1 year 5 months 19 days
Total fair value of shares vested	$ 54
PSU awards
Number of Awards
Outstanding, beginning balance	1.5
Adjusted for PSU performance factor	0.0
Granted	1.2
Vested	(0.4)
Forfeited	(0.1)
Outstanding, ending balance	2.2	1.5
Awards expected to vest	2.2
Weighted Average Grant Date Fair Value (usd per award)
Outstanding, beginning balance	$ 28.88
Adjusted for PSU performance factor	31.45
Granted	42.32
Vested	31.34
Forfeited	34.00
Outstanding, ending balance	35.53	$ 28.88
Awards expected to vest	$ 35.53
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Unrecognized compensation cost	$ 35
Expected weighted average	1 year 9 months 15 days
Total fair value of shares vested	$ 12
Stock options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning balance	3.3
Granted	0.0
Exercised	0.0
Forfeited	(0.3)
Outstanding, ending balance	3.0	3.3
Vested, not exercisable	3.0
Vested, exercisable	0.0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding, beginning balance	$ 37.60
Granted	37.60
Exercised	0.00
Forfeited	0.00
Outstanding, ending balance	37.60	$ 37.60
Vested, not exercisable, weighted average exercise price	37.60
Vested exercisable, weighted average exercise price	$ 0.00
Unrecognized compensation cost	$ 5
Expected weighted average	5 months 16 days
Total fair value of Options vested	$ 36
Maximum \| PSU awards
Number of Awards
Share-based payment award, vesting percentage	150.00%	150.00%	150.00%
Minimum \| PSU awards
Number of Awards
Share-based payment award, vesting percentage	0.00%	0.00%	0.00%
Share-based Compensation Award, Tranche Three [Member] \| Maximum \| PSU awards
Number of Awards
Share-based payment award, vesting percentage	131.00%
Share-based Compensation Award, Tranche Three [Member] \| Minimum \| PSU awards
Number of Awards
Share-based payment award, vesting percentage	125.00%