Pension Plans, Postretirement and Other Employee Benefits (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Change in plan assets:
Employer contributions	$ 45
Fair value at December 31	529
Amounts recognized in the balance sheets as of December 31
Noncurrent liabilities	(385)	(311)
United States Pension Plans of US Entity, Defined Benefits [Member]
Change in benefit obligation:
Interest cost	20	20	20
Unrecognized cost:
Net Actuarial Loss	248	165
Prior service cost/(credit)	1	2
United States Pension Plans of US Entity, Defined Benefits [Member] | Pension [Member]
Change in benefit obligation:
Benefit obligation at December 31 of the previous year	354	341
Service cost	1	1
Interest cost	20	20
Actuarial (gain)/loss	56	22
Benefits paid	(17)	(30)
Benefit obligation at December 31	414	354
Change in plan assets:
Fair value at December 31 of the previous year	242	199
Actual return on plan assets	(7)	40
Employer contributions	21	33
Benefits paid	(17)	(30)
Fair value at December 31	239	242
Development of net amount recognized:
Unfunded status at December 31	(175)	(112)
Unrecognized cost:
Net Actuarial Loss	248	165
Prior service cost/(credit)	1	2
Net amount recognized at December 31	74	55
Amounts recognized in the balance sheets as of December 31
Noncurrent assets	0	0
Current liabilities	(3)	(3)
Noncurrent liabilities	(172)	(109)
Net amount recognized	(175)	(112)
Foreign [Member]
Change in benefit obligation:
Interest cost	19	19	18
Unrecognized cost:
Net Actuarial Loss	138	120
Prior service cost/(credit)	9	11
Foreign [Member] | Pension [Member]
Change in benefit obligation:
Benefit obligation at December 31 of the previous year	361	333
Currency rate conversion	(6)	(3)
Settlement	(4)	(2)
Service cost	6	5
Interest cost	19	19
Administrative expenses/ taxes paid	(1)	(1)
Plan amendments		1
Actuarial (gain)/loss	8	21
Benefits paid	(15)	(15)
Participants' contributions	2	3
Benefit obligation at December 31	370	361
Change in plan assets:
Fair value at December 31 of the previous year	287	262
Currency rate conversion	(4)	(1)
Settlement	(4)	(2)
Actual return on plan assets		20
Employer contributions	24	20
Participants' contributions	2	3
Benefits paid	(15)	(15)
Fair value at December 31	290	287
Development of net amount recognized:
Unfunded status at December 31	(80)	(74)
Unrecognized cost:
Net Actuarial Loss	138	120
Prior service cost/(credit)	9	11
Net amount recognized at December 31	67	57
Amounts recognized in the balance sheets as of December 31
Noncurrent assets	0	1
Current liabilities	(2)	(3)
Noncurrent liabilities	(78)	(72)
Net amount recognized	(80)	(74)
Postretirement [Member]
Change in benefit obligation:
Benefit obligation at December 31 of the previous year	135	142
Service cost	1	1
Interest cost	7	8	8
Actuarial (gain)/loss	5	(7)
Benefits paid	(8)	(9)
Benefit obligation at December 31	140	135	142
Change in plan assets:
Fair value at December 31 of the previous year	0	0
Employer contributions	9	9
Prescription drug subsidy received	(1)
Benefits paid	(8)	(9)
Fair value at December 31	0	0	0
Development of net amount recognized:
Unfunded status at December 31	(140)	(135)
Unrecognized cost:
Net Actuarial Loss	64	63
Prior service cost/(credit)	(29)	(35)
Net amount recognized at December 31	(105)	(107)
Amounts recognized in the balance sheets as of December 31
Noncurrent assets	0	0
Current liabilities	(9)	(10)
Noncurrent liabilities	(131)	(125)
Net amount recognized	$ (140)	$ (135)