Postretirement Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net periodic benefit cost:
Amortization of net actuarial loss	$ 1		$ 3	$ 1
Net periodic benefit cost	8	6	22	18
Other changes in plan assets and benefit obligations recognized in other comprehensive income
Settlement	0	0	0	(2)
Change recognized in other comprehensive income	(4)	(2)	(12)	(9)
Total recognized in comprehensive income	4	4	10	9
Domestic defined benefit pension plans
Net periodic benefit cost:
Service cost	1	1	2	2
Interest cost	1	1	3	3
Expected return on plan assets	(1)	(1)	(3)	(3)
Net periodic benefit cost	2	1	5	3
Other changes in plan assets and benefit obligations recognized in other comprehensive income
Amortization of net actuarial loss	(1)		(3)	(1)
Change recognized in other comprehensive income	(1)		(3)	(1)
International defined benefit pension plans
Net periodic benefit cost:
Service cost	3	2	10	7
Interest cost	7	8	21	22
Expected return on plan assets	(7)	(7)	(23)	(22)
Amortization of net actuarial loss	3	2	9	6
Settlement	0		0	2
Net periodic benefit cost	6	5	17	15
Other changes in plan assets and benefit obligations recognized in other comprehensive income
Amortization of net actuarial loss	(3)	(2)	(9)	(6)
Settlement	0		0	(2)
Change recognized in other comprehensive income	$ (3)	$ (2)	$ (9)	$ (8)