Share-Based Payments (Details 10) - Time-vested restricted stock units - $ / shares		12 Months Ended
		Dec. 31, 2019		Dec. 31, 2018	Dec. 31, 2017
Time-vested restricted stock units
Beginning Balance, Unvested, Shares		903,000
Beginning Balance, Weighted Average Grant Date Fair Value		$ 303.18
Shares, Granted	[1]	602,000
Weighted Average Grant Date Fair Value, Granted		$ 304.44	[1]	$ 316.32	$ 293.41
Shares, Vested		(416,000)
Weighted Average Grant Date Fair Value, Vested		$ 294.71
Shares, Forfeited		(151,000)
Weighted Average Grant Date Fair Value, Forfeited		$ 311.07
Ending Balance, Unvested, Shares		938,000		903,000
Ending Balance, Weighted Average Grant Date Fair Value		$ 306.55		$ 303.18

[1] RSUs granted in 2019 primarily represent RSUs granted in conjunction with our annual awards made in February 2019 and awards made in conjunction with the hiring of new employees. RSUs granted in 2019 also include approximately 15,000 RSUs granted to our Board of Directors.