Stockbased Compensation, Stock Option Disclosures (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected Stock Price Volatility		20.00%	20.00%	21.00%
Risk Free Interest Rate		2.60%	1.90%	1.20%
Expected Life of Options (years)		4 years 4 months	4 years 4 months	4 years 4 months
Expected Annual Dividend		0.30%	0.40%	0.50%
Weighted Average Grant Date Fair Value of Options Granted in Period (in dollars per share)		$ 43.45	$ 30.73	$ 24.54
Total Intrinsic Value of Options Exercised in Period		$ 312	$ 199	$ 176
Options Outstanding [Roll Forward]
Options Outstanding, Beginning Balance		9.0
Granted		1.6
Exercised		(2.3)
Canceled / Expired		(0.3)
Options Outstanding, Ending Balance		8.0	9.0
Options, Additional Disclosures [Abstract]
Options Outstanding, Weighted Average Exercise Price, Beginning of Period (in dollars per share)		$ 121.78
Grants in Period, Weighted Average Exercise Price (in dollars per share)		211.38
Exercises in Period, Weighted Average Exercise Price (in dollars per share)		86.88
Canceled / Expired in Period, Weighted Average Exercise Price (in dollars per share)		164.58
Options Outstanding, Weighted Average Exercise Price, End of Period (in dollars per share)		$ 148.09	$ 121.78
Options Outstanding, Weighted Average Remaining Contractual Term		4 years 2 months
Options Vested and Unvested Expected to Vest		7.7
Options Vested and Unvested Expected to Vest, Weighted Average Exercise Price (in dollars per share)		$ 146.24
Options Vested and Unvested Expected to Vest, Weighted Average Remaining Contractual Term		4 years 2 months
Options Vested and Unvested Expected to Vest, Aggregate Intrinsic Value	[1]	$ 595
Options Exercisable		3.5
Options Exercisable, Weighted Average Exercise Price (in dollars per share)		$ 114.93
Options Exercisable, Weighted Average Remaining Contractual Term		2 years 10 months
Options Exercisable, Intrinsic Value	[1]	$ 382
Common Stock, Market Value Per Share		$ 223.79
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, 2018 was $223.79. The intrinsic value is zero for options with exercise prices above the market price.