Share-Based Payments (Details 8) - Time-vested restricted stock units - $ / shares		12 Months Ended
		Dec. 31, 2016		Dec. 31, 2015	Dec. 31, 2014
Time-vested restricted stock units
Beginning Balance, Unvested, Shares		810,000
Beginning Balance, Weighted Average Grant Date Fair Value		$ 323.87
Shares, Granted	[1]	649,000
Weighted Average Grant Date Fair Value, Granted		$ 268.52	[1]	$ 388.88	$ 321.72
Shares, Vested		(406,000)
Weighted Average Grant Date Fair Value, Vested		$ 285.13
Shares, Forfeited		(165,000)
Weighted Average Grant Date Fair Value, Forfeited		$ 310.30
Ending Balance, Unvested, Shares		888,000		810,000
Ending Balance, Weighted Average Grant Date Fair Value		$ 303.49		$ 323.87

[1] RSUs granted in 2016 primarily represent RSUs granted in conjunction with our annual awards made in February 2016 and awards made in conjunction with the hiring of new employees. RSUs granted in 2016 also include approximately 11,000 RSUs granted to our Board of Directors.