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Share-Based Payments (Details 8) - Performance stock units settled in stock shares in Thousands	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Performance stock units settled in stock
Beginning Balance, Unvested, Shares | shares	0
Beginning Balance, Weighted Average Grant Date Fair Value | $ / shares	$ 0.00
Shares, Granted | shares	67,000
Weighted average grant date fair value | $ / shares	$ 317.09	[1]
Shares, Vested | shares	0
Weighted Average Grant Date Fair Value, Vested | $ / shares	$ 0.00
Shares, Forfeited | shares	(7,000)
Weighted Average Grant Date Fair Value, Forfeited | $ / shares	$ 315.70
Ending Balance, Unvested, Shares | shares	60,000
Ending Balance, Weighted Average Grant Date Fair Value | $ / shares	$ 317.26
[1] MSUs granted during 2018 include awards granted in conjunction with our annual awards made in February 2018 and MSUs granted in conjunction with the hiring of employees. These grants reflect the target number of shares eligible to be earned at the time of grant. MSUs granted in 2018 also reflect an adjustment based upon the final performance multiplier in relation to shares granted in 2017, 2016 and 2015.

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Performance Stock Units Settled in Stock [Abstract]

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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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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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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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