Stockbased Compensation, Stock Option Disclosures (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax benefit related to employees' and directors' stock plans		$ 63.2	$ 65.4	$ 46.6
Expected Stock Price Volatility		24.00%	25.00%	33.00%
Risk Free Interest Rate		1.40%	1.30%	0.70%
Expected Life of Options (years)		4 years 4 months	4 years 5 months	4 years 6 months
Expected Annual Dividend		0.50%	0.50%	0.80%
Weighted Average Grant Date Fair Value of Options Granted in Period (in dollars per share)		$ 27.04	$ 26.89	$ 19.84
Total Intrinsic Value of Options Exercised in Period		$ 181.0	$ 208.0	$ 190.0
Options Outstanding [Roll Forward]
Options Outstanding, Beginning Balance		10.5
Granted		1.9
Exercised		(2.3)
Canceled / Expired		(0.5)
Options Outstanding, Ending Balance		9.6	10.5
Options, Additional Disclosures [Abstract]
Options Outstanding, Weighted Average Exercise Price, Beginning of Period (in dollars per share)		$ 71.34
Grants in Period, Weighted Average Exercise Price (in dollars per share)		130.98
Exercises in Period, Weighted Average Exercise Price (in dollars per share)		53.79
Canceled / Expired in Period, Weighted Average Exercise Price (in dollars per share)		107.90
Options Outstanding, Weighted Average Exercise Price, End of Period (in dollars per share)		$ 85.30	$ 71.34
Options Outstanding, Weighted Average Remaining Contractual Term		4 years
Options Vested and Unvested Expected to Vest		9.2
Options Vested and Unvested Expected to Vest, Weighted Average Exercise Price (in dollars per share)		$ 83.81
Options Vested and Unvested Expected to Vest, Weighted Average Remaining Contractual Term		3 years 11 months
Options Vested and Unvested Expected to Vest, Aggregate Intrinsic Value	[1]	$ 534.6
Options Exercisable		5.0
Options Exercisable, Weighted Average Exercise Price (in dollars per share)		$ 61.28
Options Exercisable, Weighted Average Remaining Contractual Term		2 years 10 months
Options Exercisable, Intrinsic Value	[1]	$ 400.8
Common Stock, Market Value Per Share		$ 141.85
Minimum [Member] | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Requisite Service Period		3 years
Option Term		7 years
Maximum [Member] | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Requisite Service Period		5 years
Option Term		10 years

[1] Market price per share on December 31, 2015 was $141.85. The intrinsic value is zero for options with exercise prices above the market price.