Stock Options and Other Share-Based Compensation (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Stock Option
Expected term in years	6 years	[1]	6 years 0 months 12 days	[1]	6 years 2 months 12 days	[1]
Volatility	31.30%	[2]	31.70%	[2]	31.00%	[2]
Risk-free interest rate based on zero coupon U.S. treasury note	1.20%		1.10%		2.60%
Dividend yield	3.30%		3.20%		3.60%
Weighted-average fair value per option granted	$ 24.48		$ 23.35		$ 21.24
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares, Outstanding at January 1, 2013 (in shares)	71,895
Shares, Granted (in shares)	13,194
Shares, Exercised (in shares)	(8,377)
Shares, Forfeited (in shares)	(1,086)
Shares, Outstanding at December 31, 2013 (in shares)	75,626		71,895
Shares, Exercisable at December 31, 2013 (in shares)	51,797
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted-Average Exercise Price, Outstanding at January 1, 2013 (in dollars per share)	$ 81.26
Weighted-Average Exercise Price, Granted (in dollars per share)	$ 116.45
Weighted-Average Exercise Price, Exercised (in dollars per share)	$ 68.20
Weighted-Average Exercise Price, Forfeited (in dollars per share)	$ 93.98
Weighted-Average Exercise Price, Outstanding at December 31, 2013 (in dollars per share)	$ 88.44		$ 81.26
Weighted-Average Exercise Price, Exercisable at December 31, 2013 (in dollars per share)	$ 78.52
Average Remaining Contractual Term, Outstanding at December 31, 2013 (in years)	6 years 1 month 13 days
Average Remaining Contractual Term, Exercisable at December 31, 2013 (in years)	5 years 0 months 18 days
Aggregate Intrinsic Value, Outstanding at December 31, 2013	$ 2,758
Aggregate Intrinsic Value, Exercisable at December 31, 2013	$ 2,403

[1] Expected term is based on historical exercise and postvesting cancellation data.

[2] Volatility rate is based on historical stock prices over an appropriate period, generally equal to the expected term.