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Share-Based Payments (Details 5) - Market stock units - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Assumptions used in valuation of market based stock units      
Expected dividend yield 0.00% 0.00% 0.00%
Minimum range of risk-free interest rates 1.90% 0.90% 0.60%
Maximum range of risk-free interest rates 2.30% 1.60% 0.90%
Average stock price on grant date minimum $ 279.47 $ 263.18 $ 260.67
Average stock price on grant date maximum $ 346.76 $ 267.88 $ 304.86
Weighted average grant date fair value $ 378.85 [1] $ 382.59 $ 328.03
Minimum      
Assumptions used in valuation of market based stock units      
Range of expected stock price volatility 27.50% 33.00% 38.20%
Maximum      
Assumptions used in valuation of market based stock units      
Range of expected stock price volatility 32.40% 35.60% 40.70%
[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.