Common Stock Shares

No definition available.

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- Definition

Number Of Shares That Count Towards Shares Authorized Limit

+ References

No definition available.

+ Details

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- Definition

Percentage Of Units Earned Of Units Granted

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Award Performance Period

+ References

No definition available.

+ Details

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Term after Termination upon Cancellation

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No definition available.

+ Details

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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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.

+ References

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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.

+ References

No definition available.

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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- Definition

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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- Definition

Percentage of vesting of share-based compensation awards.

+ References

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- Definition

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.

+ 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 (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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Stock Compensation Plans - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award
Potential shares of common stock issued under current stock compensation plan (in shares)	18,000,000
Contractual term	7 years 2 months 12 days	7 years 2 months 12 days	7 years 3 months 18 days
Aggregate intrinsic value of options exercised	$ 18	$ 14	$ 40
Unearned compensation cost related to unvested portion	$ 28
Options
Share-based Compensation Arrangement by Share-based Payment Award
Shares that count towards shares authorized limit per share granted (in shares)	1
Vesting period	4 years
Stock options conversion basis (in shares)	1
Contractual term	10 years
Cancellation, days after termination of employment	90 days
Options \| Year 1
Share-based Compensation Arrangement by Share-based Payment Award
Vesting percentage	25.00%
Options \| Year 2
Share-based Compensation Arrangement by Share-based Payment Award
Vesting percentage	25.00%
Options \| Year 3
Share-based Compensation Arrangement by Share-based Payment Award
Vesting percentage	25.00%
Options \| Year 4
Share-based Compensation Arrangement by Share-based Payment Award
Vesting percentage	25.00%
Awards, Excluding Options
Share-based Compensation Arrangement by Share-based Payment Award
Shares that count towards shares authorized limit per share granted (in shares)	2.0
Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award
Award performance period	3 years
Performance Share Units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award
Percentage of units earned to units granted	0.00%
Performance Share Units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award
Percentage of units earned to units granted	200.00%
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Award performance period	3 years