Share-Based Compensation - Schedule of the Transactions of the Company's Stock Options (Details) (Stock Options, USD $) In Millions, except Per Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2014
Stock Options
Stock Options
Unexercised options outstanding at the beginning of the period (in shares)	3.0
Options granted (in shares)	0
Options exercised (in shares)	(0.4)
Options forfeited (in shares)	0
Unexercised options outstanding at the end of the period (in shares)	2.6
Exercisable at the end of the period (in shares)	2.0
Weighted Average Exercise Price
Unexercised options outstanding at the beginning of the period (in dollars per share)	$ 77.71
Options granted (in dollars per share)	$ 186.34
Options exercised (in dollars per share)	$ 66.27
Options forfeited (in dollars per share)	$ 81.50
Unexercised options outstanding at the end of the period (in dollars per share)	$ 79.30
Exercisable at the end of the period (in dollars per share)	$ 75.04
Weighted Average Remaining Contractual Life
Unexercised options outstanding at the end of the period (in years)	3 years
Exercisable at the end of the period (in years)	2 years 9 months 18 days