Restructuring and Reorganization (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Employee	Dec. 31, 2010 Employee
Restructuring and reorganization costs (Additional Textual) [Abstract]
Number of affected positions under employee reduction program	2,700	2,700
Restructuring and reorganization
Balance at January 1, 2011	$ 138
Adjustments	(28)
Payments	(74)
Balance at December 31, 2011	36	138
Restructuring and Reorganization (Textual) [Abstract]
Number of affected positions under employee reduction program	2,700	2,700
Total Employees Terminated Through 2011	2,500
Before tax charge of restructuring and recurring costs recorded in the first quarter of 2010		244
Restructuring and related cost outstanding		138
Payment for Restructuring and Related Cost	$ 74
U.S. [Member]
Restructuring and reorganization costs (Additional Textual) [Abstract]
Number of affected positions under employee reduction program	1,300
Restructuring and Reorganization (Textual) [Abstract]
Number of affected positions under employee reduction program	1,300