Share-Based Payments (Details 7) (Time-vested restricted stock units, USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Time-vested restricted stock units
Time-vested restricted stock units
Beginning Balance, Unvested, Shares	2,187,000
Beginning Balance, Weighted Average Grant Date Fair Value	$ 90.37
Shares, Granted	758,000	[1]
Weighted Average Grant Date Fair Value, Granted	$ 176.53	[1]	$ 124.54	$ 70.01
Shares, Vested	(1,181,000)
Weighted Average Grant Date Fair Value, Vested	$ 79.17
Shares, Forfeited	(104,000)
Weighted Average Grant Date Fair Value, Forfeited	$ 119.42
Ending Balance, Unvested, Shares	1,660,000		2,187,000
Ending Balance, Weighted Average Grant Date Fair Value	$ 135.95		$ 90.37

[1] RSUs granted in 2013 primarily represent RSUs granted in conjunction with our annual awards made in February 2013 and awards made in conjunction with the hiring of new employees. RSUs granted in 2013 also include approximately 16,000 RSUs granted to our Board of Directors.