Postretirement Benefit Plans (Details 7) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net periodic benefit cost:
Service cost	$ 7	$ 7	$ 5
Interest cost	15	16	16
Expected return on plan assets	(19)	(18)	(18)
Amortization of net actuarial loss	4	2	2
Amortization of prior service cost	1	1	1
Net periodic benefit cost (income)	8	8	6
Effect of curtailment/ Special termination benefit	3	2	0
Total net periodic benefit cost (income)	11	10	6
Other changes in plan assets and benefit obligations recognized in other comprehensive income
Net loss	(51)	(5)	10
Prior service cost	0	1	0
Amortization of net actuarial loss	(4)	(2)	(2)
Amortization of prior service cost	(3)	(1)	(1)
Total change recognized in other comprehensive income	44	3	(13)
Total impact from net periodic benefit cost and changes in other comprehensive income	55	13	(7)
U.S. Pension Plans [Member]
Net periodic benefit cost:
Service cost	6	6	4
Interest cost	13	14	13
Expected return on plan assets	(19)	(18)	(18)
Amortization of net actuarial loss	4	2	2
Amortization of prior service cost	1	1	1
Net periodic benefit cost (income)	5	5	2
Effect of curtailment/ Special termination benefit	3	0
Total net periodic benefit cost (income)	8	5	2
Other changes in plan assets and benefit obligations recognized in other comprehensive income
Net loss	(52)	(5)	10
Prior service cost	0	1	0
Amortization of net actuarial loss	(4)	(2)	(2)
Amortization of prior service cost	(3)	(1)	(1)
Total change recognized in other comprehensive income	45	3	(13)
Total impact from net periodic benefit cost and changes in other comprehensive income	53	8	(11)
International Pension Plan [Member]
Net periodic benefit cost:
Service cost	1	1	1
Interest cost	2	2	3
Expected return on plan assets	0	0	0
Amortization of net actuarial loss	0	0	0
Amortization of prior service cost	0	0	0
Net periodic benefit cost (income)	3	3	4
Effect of curtailment/ Special termination benefit	0	2	0
Total net periodic benefit cost (income)	3	5	4
Other changes in plan assets and benefit obligations recognized in other comprehensive income
Net loss	1	0	0
Prior service cost	0	0	0
Amortization of net actuarial loss	0	0	0
Amortization of prior service cost	0	0	0
Total change recognized in other comprehensive income	(1)	0	0
Total impact from net periodic benefit cost and changes in other comprehensive income	2	5	4
Other Benefits [Member]
Net periodic benefit cost:
Service cost	2	2	2
Interest cost	9	9	10
Expected return on plan assets	(1)	(1)	(1)
Amortization of net actuarial loss	3	1	2
Total net periodic benefit cost (income)	13	11	13
Other changes in plan assets and benefit obligations recognized in other comprehensive income
Net loss	15	2	7
Amortization of net actuarial loss	(3)	(1)	(2)
Total change recognized in other comprehensive income	12	1	5
Total impact from net periodic benefit cost and changes in other comprehensive income	$ 25	$ 12	$ 18