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Share-Based Compensation (Recognized Share-Based Compensation Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Allocated share-based compensation expense	$ 89	$ 82	$ 165	$ 151
Stock Options [Member]
Allocated share-based compensation expense	36	38	68	67
Restricted Share Units [Member]
Allocated share-based compensation expense	48	41	86	76
Employee Stock Purchase Plan [Member]
Allocated share-based compensation expense	$ 5	$ 3	$ 11	$ 8

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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