Stock-Based Compensation (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock or Unit Option Plan Expense	$ 26	$ 25	$ 76	$ 73
Restricted Stock or Unit Expense	$ 18	$ 10	$ 45	$ 28
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	29		29
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 47.16		$ 47.16
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term			4 years 3 months 28 days