Postretirement Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Net periodic benefit cost:
Amortization of net actuarial loss	$ 1	$ 1
Net periodic benefit cost	6	7
Domestic defined benefit pension plans
Net periodic benefit cost:
Service cost	0	1
Interest cost	1	1
Expected return on plan assets	(1)	(1)
Net periodic benefit cost	1	2
International defined benefit pension plans
Net periodic benefit cost:
Service cost	4	3
Interest cost	7	7
Expected return on plan assets	(8)	(8)
Amortization of net actuarial loss	2	3
Net periodic benefit cost	$ 5	$ 5