Long-Term Incentive Plans (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2000
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum term of awards	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of shares outstanding at beginning of period	21,408,268
Number of shares granted	3,913,368	3,937,989	4,162,653
Number of shares forfeited	(252,126)
Number of shares expired	(350)
Number of shares exercised	(3,562,900)
Number of shares outstanding at end of period	21,506,260	21,408,268
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted average exercise price - outstanding at beginning of period	$ 98.10
Weighted average exercise price - granted	$ 385.33	$ 263.77	$ 167.96
Weighted average exercise price - forfeited	$ 155.37
Weighted average exercise price - expired	$ 64.35
Weighted average exercise price - exercised	$ 44.72
Weighted average exercise price - outstanding at end of period	$ 158.54	$ 98.10
Weighted average remaining contractual term (in years) - outstanding	6 years 11 months 26 days
Instrinsic value - outstanding	$ 5,467,783,000
Number of shares vested and expected to vest	20,988,044
Weighted average execise price - vested and expected to vest	$ 154.81
Weighted average remaining contractual term - vested and expected to vest	6 years 11 months 8 days
Intrinsic value - vested and expected to vest	5,414,258,000
Number of shares exercisable	12,104,560
Weighted average exercise price - exercisable	$ 65.48
Weighted average remaining contractual term - exercisable	5 years 6 months 10 days
Intrinsic value - exercisable	4,203,941,000
Total intrinsic value - of stock options exercised	1,081,200,000	727,500,000	566,700,000
Exercise Price Equal to Market Price [Abstract]
Number of Options Granted (shares)	3,913,368	3,937,989	4,162,653
Weighted Average Exercise Price (dollars per share)	$ 385.33	$ 263.77	$ 167.96
Weighted Average Fair Value	$ 140.38	$ 104.90	$ 67.66
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected volatility	39.00%	42.00%	45.00%
Expected lives from grant date	5 years 2 months 11 days	5 years 4 months 1 day	5 years 4 months 24 days
Expected dividend yield	0.00%	0.00%	0.00%
Risk-free interest rate	1.62%	1.73%	0.86%
Stock options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Stock options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Phantom stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period within vesting date that awards may be received	P30D
Non-performance based stock options
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Non-cash stock-based compensation expense	291,600,000	176,400,000	67,700,000
Unrecognized stock-based compensation cost, net of estimated forfeitures	706,000,000
Weighted average period for recognition of total unrecognized compensation expense (in years)	1 year 10 months 30 days
Performance-based stock options
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Non-cash stock-based compensation expense	4,100,000	8,000,000	15,300,000
Number of unvested options (shares)	0	770,250
Restricted stock
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Non-cash stock-based compensation expense	11,500,000	14,000,000	11,100,000
Unrecognized stock-based compensation cost, net of estimated forfeitures	$ 34,500,000
Weighted average period for recognition of total unrecognized compensation expense (in years)	2 years 9 months 2 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Number of shares outstanding at beginning of period	538,580
Number of shares granted	7,500
Number of shares vested	(20)
Number of shares outstanding at end of period	546,060	538,580
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Weighted average grant date fair value at beginning of period	$ 112.16
Weighted average grant date fair value - granted	$ 338.32
Weighted average grant date fair value - vested	$ 237.68
Weighted average grant date fair value at end of period	$ 115.26	$ 112.16
Long-Term Incentive Plan 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for issuance	16,485,333			35,397,043
Number of shares available for future grants	13,558,022
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of shares exercised	(3,468,000)	(3,052,000)	(5,086,000)
Common Stock | Long-Term Incentive Plan 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for issuance	4,485,333