Equity - Restricted stock units (Details) - Restricted stock units (RSUs) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
Mar. 31, 2019 USD ($) $ / shares shares
Share-based compensation
Vesting terms	3 years
Service period over which compensation expense would be amortized	1 year
Restricted stock unit activity
Non-vested at the beginning of the period (in shares) \| shares	341
Granted (in shares) \| shares	148
Vested (in shares) \| shares	(123)
Cancelled (in shares) \| shares	(15)
Non-vested at the end of the period (in shares) \| shares	351
Weighted-average fair value per share
Non-vested at the beginning of the period (in dollars per share) \| $ / shares	$ 115.06
Granted (in dollars per share) \| $ / shares	91.94
Vested (in dollars per share) \| $ / shares	100.20
Cancelled (in dollars per share) \| $ / shares	121.62
Non-vested at the end of the period (in dollars per share) \| $ / shares	$ 110.25
Other disclosures
Unrecognized compensation cost \| $	$ 23
Weighted-average period for amortization of unrecognized compensation cost	2 years 2 months 12 days

No definition available.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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-Publisher FASB
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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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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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- References

No definition available.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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- Definition

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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- 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

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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No definition available.

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- Definition

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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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- Definition

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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- 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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