Share-Based Compensation (Plan Activities) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Options
Outstanding, beginning balnce (in shares)	77,200
Granted (in shares)	11,800
Exercised (in shares)	(11,500)
Forfeited (in shares)	(1,700)
Expired (in shares)	(100)
Outstanding, ending balance (in shares)	75,700	77,200
Vested or expected to vest in the future (in shares)	75,100
Vested (in shares)	41,200
Weighted Average Exercise Price Per Option
Outstanding, beginning balance (in dollars per share)	$ 49.47
Granted (in dollars per share)	118.65
Exercised (in dollars per share)	34.39
Forfeited (in dollars per share)	74.20
Expired (in dollars per share)	39.48
Outstanding, ending balance (in dollars per share)	61.99	$ 49.47
Vested or expected to vest in the future (in dollars per share)	61.64
Vested (in dollars per share)	$ 41.12
Weighted Average Remaining Contractual Term (Years)
Outstanding, weighted average remaining (in years)	6 years 7 months 6 days	6 years 10 months 24 days
Vested at December 31, 2015 or expected to vest in the future (in years)	6 years 7 months 6 days
Vested at December 31, 2015 (in years)	5 years 3 months 18 days
Aggregate Intrinsic Value (In Millions)
Outstanding	$ 4,411.8	$ 4,823.8
Vested or expected to vest in the future	4,400.1
Vested	$ 3,238.5
Nonvested RSUs
Share Equivalent
Nonvested, beginning balance (in shares)	9,400
Granted (in shares)	2,500
Exercised (in shares)	(3,800)
Forfeited (in shares)	(400)
Nonvested, ending balance (in shares)	7,700	9,400
Weighted Average Grant Date Fair Value
Nonvested, beginning balance (in dollars per share)	$ 59.02
Granted (in dollars per share)	112.98
Vested (in dollars per share)	37.57
Forfeited (in dollars per share)	71.95
Nonvested, ending balance (in dollars per share)	$ 86.28	$ 59.02
Nonvested Performance-Based RSUs
Share Equivalent
Nonvested, beginning balance (in shares)	133
Granted (in shares)	211
Exercised (in shares)	0
Forfeited (in shares)	(10)
Nonvested, ending balance (in shares)	334	133
Weighted Average Grant Date Fair Value
Nonvested, beginning balance (in dollars per share)	$ 69.57
Granted (in dollars per share)	112.14
Vested (in dollars per share)	0.00
Forfeited (in dollars per share)	82.91
Nonvested, ending balance (in dollars per share)	$ 96.07	$ 69.57