Share Based Compensation Arrangement By Share Based Payment Award Award Remaining Vesting Percentage

No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award Allocation Percentage

+ References

No definition available.

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- Definition

Sharebased compensation arrangement by sharebased payment award granted percentage

+ References

No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Shares Paid out as Percentage of Target

+ References

No definition available.

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- Definition

Weighted-average remaining life of unvested restricted stock units.

+ References

No definition available.

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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.

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- Definition

Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, 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
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- Definition

Unrecognized cost of unvested share-based compensation awards.

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- Definition

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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- Definition

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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- Definition

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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- Definition

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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- Definition

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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No definition available.

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- Definition

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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- Definition

Percentage of vesting of share-based compensation awards.

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- Definition

Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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CAPITAL STOCK - Performance Program Narrative (Detail) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended				12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016	Feb. 28, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized and available for grant					16,900,000
Compensation expense					$ 142	$ 131	$ 100
Stock-based compensation capitalized					41	40	53
Conditional Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense					23	14	3
Stock-based compensation capitalized					4	$ 2	$ 1
Total compensation cost related to non-vested awards not yet recognized					$ 38
Nonvested shares outstanding					1,693,637
Weighted-average remaining life of unvested restricted stock units					1 year 6 months 24 days
Phantom Units \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation cost related to non-vested awards not yet recognized	$ 90
Performance Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares allocation percentage					50.00%
Shares vesting period					3 years
Performance Program \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vesting percentage					50.00%
Remaining shares vesting percentage					50.00%
Performance Program \| Conditional Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted during period (in shares)					621,000
Nonvested shares outstanding					1,694,000	1,225,000
Weighted average grant date fair value per share (in USD per share)					$ 66.97
2015 Performance Program \| Conditional Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted during period (in shares)				602,304
Shares paid out as percentage of target					100.00%
Total awards, outstanding					384,967
2016 Performance Program \| Conditional Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted during period (in shares)			871,369
Total awards, outstanding					749,334
2016 Performance Program \| Conditional Restricted Stock \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares awarded of target					0.00%
Shares authorized and available for grant					0
2016 Performance Program \| Conditional Restricted Stock \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares awarded of target					200.00%
Shares authorized and available for grant					1,498,668
2017 Performance Program \| Conditional Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted during period (in shares)		620,885
Total awards, outstanding					559,336
2017 Performance Program \| Conditional Restricted Stock \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares awarded of target					0.00%
Shares authorized and available for grant					0
2017 Performance Program \| Conditional Restricted Stock \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares awarded of target					200.00%
Shares authorized and available for grant					1,118,672
2018 Performance Program \| Phantom Units \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted during period (in shares)	872,030
2018 Performance Program \| Phantom Units \| Subsequent Event \| Monte Carlo Simulation
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value per share (in USD per share)	$ 54.70
2018 Performance Program \| Phantom Units \| Subsequent Event \| Fair Market Value at Grant Date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares allocation percentage	50.00%
Weighted average grant date fair value per share (in USD per share)	$ 46.27
2018 Performance Program \| Phantom Units \| Subsequent Event \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized and available for grant	0
2018 Performance Program \| Phantom Units \| Subsequent Event \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized and available for grant	1,744,060