Shareholders' Equity (Details 1) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding, Beginning balance	7,219,742
Granted	1,037,665
Exercised	(1,625,023)
Forfeited/Cancelled	(23,770)
Options outstanding, Ending balance	6,608,614	7,219,742
Options exercisable	3,834,299
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Average exercise price, Beginning balance	$ 29.40
Average exercise price, Granted	$ 44.01	$ 38.10	$ 34.34
Average exercise price, Exercised	$ 27.39
Average exercise price, Forfeited/Cancelled	$ 37.85
Average exercise price, Ending balance	$ 32.16	$ 29.40
Average exercise price, Options exercisable	$ 28.81
Average remaining contractual term, Options outstanding	5 years 7 months 6 days
Average remaining contractual term, Options exercisable	4 years
Aggregate intrinsic value, Options outstanding	$ 169
Aggregate intrinsic value, Options exercisable	$ 111