Pension Benefit Plans and Other Postretirement Benefits (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
U.S Pension Plans
Defined Benefit Plan Disclosure
Plan assets at fair value	$ 2,175	$ 2,011	$ 2,195
Projected benefit and postretirement benefit obligations	(2,647)	(2,547)	(2,437)
Plan assets less than projected benefit obligations	(472)	(536)
Items not yet recognized in pension expense and net postretirement benefit cost:
Actuarial (gain) loss	1,461	1,478
Prior service credit	2	2
Total	1,463	1,480
Net amount recognized	991	944
Non-U.S. Pension Plans
Defined Benefit Plan Disclosure
Plan assets at fair value	1,527	1,325	1,279
Projected benefit and postretirement benefit obligations	(1,911)	(1,553)	(1,567)
Plan assets less than projected benefit obligations	(384)	(228)
Items not yet recognized in pension expense and net postretirement benefit cost:
Actuarial (gain) loss	534	312
Prior service credit	(9)	(10)
Total	525	302
Net amount recognized	141	74
U.S Postretirement Benefit Plans
Defined Benefit Plan Disclosure
Projected benefit and postretirement benefit obligations	(181)	(194)	(195)
Items not yet recognized in pension expense and net postretirement benefit cost:
Actuarial (gain) loss	36	49
Prior service credit	(8)	(11)
Total	28	38
Net amount recognized	(153)	(156)
Non-U.S. Postretirement Benefit Plans
Defined Benefit Plan Disclosure
Projected benefit and postretirement benefit obligations	(102)	(95)	(85)
Items not yet recognized in pension expense and net postretirement benefit cost:
Actuarial (gain) loss	5	2
Total	5	2
Net amount recognized	$ (97)	$ (93)