Pension Benefit Plans and Other Postretirement Benefits (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
U.S Pension Plans
Changes in the pension and postretirement benefit obligations
Obligations at beginning of year	$ 2,547	$ 2,437
Change in benefit obligations:
Service cost	27	25	25
Interest cost	114	125	131
Actuarial (gain) loss, including the effect of change in discount rates	170	130
Benefit payments	(220)	(172)
Other	9	2
Net change in benefit obligations	100	110
Obligations at end of year	2,647	2,547	2,437
Changes in fair value of pension plan assets
Fair value at beginning of year	2,011	2,195
Actual gain (loss) on plan assets	275	(13)
Benefit payments	(220)	(172)
Employer contributions	109	1
Net change in fair value of assets	164	(184)
Fair value at end of year	2,175	2,011	2,195
Non-U.S. Pension Plans
Changes in the pension and postretirement benefit obligations
Obligations at beginning of year	1,553	1,567
Change in benefit obligations:
Service cost	26	24	21
Interest cost	77	83	79
Actuarial (gain) loss, including the effect of change in discount rates	293	(37)
Participant contributions	7	8
Benefit payments	(101)	(87)
Other		19
Foreign currency translation	56	(24)
Net change in benefit obligations	358	(14)
Obligations at end of year	1,911	1,553	1,567
Changes in fair value of pension plan assets
Fair value at beginning of year	1,325	1,279
Actual gain (loss) on plan assets	118	80
Benefit payments	(101)	(87)
Employer contributions	110	58
Participant contributions	7	8
Foreign currency translation	43	(25)
Other	25	12
Net change in fair value of assets	202	46
Fair value at end of year	1,527	1,325	1,279
U.S Postretirement Benefit Plans
Changes in the pension and postretirement benefit obligations
Obligations at beginning of year	194	195
Change in benefit obligations:
Service cost	1	1	1
Interest cost	8	10	11
Actuarial (gain) loss, including the effect of change in discount rates	(6)	4
Benefit payments	(16)	(16)
Net change in benefit obligations	(13)	(1)
Obligations at end of year	181	194	195
Changes in fair value of pension plan assets
Benefit payments	(16)	(16)
Non-U.S. Postretirement Benefit Plans
Changes in the pension and postretirement benefit obligations
Obligations at beginning of year	95	85
Change in benefit obligations:
Service cost	1	1	1
Interest cost	4	4	5
Actuarial (gain) loss, including the effect of change in discount rates	3	11
Benefit payments	(3)	(4)
Foreign currency translation	2	(2)
Net change in benefit obligations	7	10
Obligations at end of year	102	95	85
Changes in fair value of pension plan assets
Benefit payments	$ (3)	$ (4)