Stockbased Compensation, Stock Option Disclosures (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected Stock Price Volatility	21.00%	20.00%	20.00%
Risk Free Interest Rate	2.40%	2.60%	1.90%
Expected Life of Options (years)	4 years 3 months 18 days	4 years 3 months 18 days	4 years 3 months 18 days
Expected Annual Dividend	0.30%	0.30%	0.40%
Weighted Average Grant Date Fair Value of Options Granted in Period (in dollars per share)	$ 53.37	$ 43.45	$ 30.73
Total Intrinsic Value of Options Exercised in Period	$ 320	$ 312	$ 199
Options Outstanding [Roll Forward]
Options Outstanding, Beginning Balance	8.0
Granted	1.3
Exercised	(2.0)
Canceled / Expired	(0.4)
Options Outstanding, Ending Balance	6.9	8.0
Options, Additional Disclosures [Abstract]
Options Outstanding, Weighted Average Exercise Price, Beginning of Period (in dollars per share)	$ 148.09
Grants in Period, Weighted Average Exercise Price (in dollars per share)	256.61
Exercises in Period, Weighted Average Exercise Price (in dollars per share)	111.13
Canceled / Expired in Period, Weighted Average Exercise Price (in dollars per share)	193.78
Options Outstanding, Weighted Average Exercise Price, End of Period (in dollars per share)	$ 176.26	$ 148.09
Options Outstanding, Weighted Average Remaining Contractual Term	4 years 1 month 6 days
Options Vested and Unvested Expected to Vest	6.6
Options Vested and Unvested Expected to Vest, Weighted Average Exercise Price (in dollars per share)	$ 174.33
Options Vested and Unvested Expected to Vest, Weighted Average Remaining Contractual Term	4 years 1 month 6 days
Options Vested and Unvested Expected to Vest, Aggregate Intrinsic Value	$ 992
Options Exercisable	3.1
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 141.20
Options Exercisable, Weighted Average Remaining Contractual Term	2 years 10 months 24 days
Options Exercisable, Intrinsic Value	$ 561
Minimum [Member] | Share-based Payment Arrangement, 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] | Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Requisite Service Period	5 years
Option Term	10 years