Pension Benefit Plans and Other Postretirement Benefits (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
U.S Pension Plans
Defined Benefit Plan Disclosure
Plan assets at fair value	$ 2,011	$ 2,195	$ 2,061
Projected benefit and postretirement benefit obligations	(2,547)	(2,437)	(2,307)
Plan assets less than projected benefit obligations	(536)	(242)
Items not yet recognized in pension expense and net postretirement benefit cost:
Actuarial (gain) loss	1,478	1,232
Prior service credit	2	(1)
Total	1,480	1,231
Net amount recognized	944	989
Non-U.S. Pension Plans
Defined Benefit Plan Disclosure
Plan assets at fair value	1,325	1,279	1,223
Projected benefit and postretirement benefit obligations	(1,553)	(1,567)	(1,518)
Plan assets less than projected benefit obligations	(228)	(288)
Items not yet recognized in pension expense and net postretirement benefit cost:
Actuarial (gain) loss	312	359
Prior service credit	(10)	(11)
Total	302	348
Net amount recognized	74	60
U.S Postretirement Benefit Plans
Defined Benefit Plan Disclosure
Projected benefit and postretirement benefit obligations	(194)	(195)	(201)
Items not yet recognized in pension expense and net postretirement benefit cost:
Actuarial (gain) loss	49	50
Prior service credit	(11)	(14)
Total	38	36
Net amount recognized	(156)	(159)
Non-U.S. Postretirement Benefit Plans
Defined Benefit Plan Disclosure
Projected benefit and postretirement benefit obligations	(95)	(85)	(88)
Items not yet recognized in pension expense and net postretirement benefit cost:
Actuarial (gain) loss	2	(10)
Total	2	(10)
Net amount recognized	$ (93)	$ (95)