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Share-Based Compensation (Recognized Share-Based Compensation Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Allocated share-based compensation expense	$ 76	$ 69
Stock Options [Member]
Allocated share-based compensation expense	32	29
Restricted Share Units [Member]
Allocated share-based compensation expense	38	35
Employee Stock Purchase Plan [Member]
Allocated share-based compensation expense	$ 6	$ 5

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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