Defined Contribution Plan, Maximum Employee Contribution, Percentage

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- Definition

Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Adjustments

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- Definition

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

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Market Price, Purchase Date

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No definition available.

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- Definition

Share-based Compensation Arrangement, Maximum Duration of Common Stock Purchasing Period

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No definition available.

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- Definition

Share-based Compensation, Options to Purchase Common Shares

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- Definition

Stock Issued During Period, Average Price Per Share, Employee Stock Purchase Plan

+ References

No definition available.

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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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- Definition

Maximum amount the employee may contribute to a defined contribution plan.

+ References

No definition available.

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- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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.

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

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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 highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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).

+ 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 (a)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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.

+ References

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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.

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

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Percentage of vesting of share-based compensation awards.

+ References

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- Definition

Period from grant date that an equity-based award expires, 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
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

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-Name Accounting Standards Codification
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Employee Benefit Plans - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional compensation expense to be recognized over the remaining vesting life of underlying awards	$ 68,000,000
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average grant date fair value (in usd per share)		$ 5.40	$ 6.84
Intrinsic value of exercises during period	$ 26,000,000	$ 16,000,000	$ 130,000,000
Outstanding option to purchase shares	3,000,000
Grants and options assumed in period	0	0	0
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares outstanding	42,000,000	44,000,000
Deferred Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares outstanding	259,632
Deferred Stock Unit \| Graded Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	2.08%
Deferred Stock Unit \| Cliff Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	25.00%
Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	755,000,000
Shares available for grant	76,000,000
Equity Incentive Plan \| Employee Stock Option \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award expiration term	7 years
Equity Incentive Plan \| Employee Stock Option \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award expiration term	10 years
Equity Incentive Plan \| Employee Stock Option \| Graded Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	2.08%
Equity Incentive Plan \| Employee Stock Option \| Existing Employees \| Cliff Vesting, Six Months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	12.50%
Equity Incentive Plan \| Employee Stock Option \| New Employees \| Cliff Vesting, Year One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	25.00%
Equity Incentive Plan \| Restricted Stock Units (RSUs) \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Equity Incentive Plan \| Restricted Stock Units (RSUs) \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum duration of common stock purchasing period	2 years
Employee stock purchase plan, purchase price offered, percentage of fair market value	85.00%
Maximum employee subscription rate	10.00%
Number of shares purchased under plan	4,000,000	4,000,000	4,000,000
Employee stock purchase plan, average price of purchased shares (in usd per share)	$ 22.32	$ 18.97	$ 30.83
Number of shares reserved for future issuance	16,000,000
Employee Savings Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Defined contribution, maximum employee contribution, percentage of eligible compensation	50.00%
Defined contribution, maximum annual contributions per employee, percent	4.00%
Defined contribution, maximum annual contributions per employee	$ 10,800	$ 10,600	$ 10,600
Defined contribution, total expenses	$ 57,000,000	$ 49,000,000	$ 51,000,000
Executive \| Equity Incentive Plan \| Restricted Stock Units (RSUs) \| Vesting in March following the end of performance period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	50.00%	50.00%	50.00%
Executive \| Equity Incentive Plan \| Restricted Stock Units (RSUs) \| Vesting period 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	50.00%	50.00%	50.00%