Information Relating to the Consolidated Statement of Cash Flows (Details Textual) (USD $) Share data in Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Information Relating to the Consolidated Statement of Cash Flows (Textual) [Abstract]
Reduction for income tax benefits associated with stock options exercised	$ 87,000,000	$ 132,000,000
Proceeds to be received in future periods for the sale of an equity interest	800,000,000
Net (purchases) sales of treasury shares	3,800,000,000	3,000,000,000
Common share purchase (in shares)	35.1	30.0
Share repurchase value	$ 3,700,000,000	$ 3,000,000,000