Pension and Other Postretirement Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
U.S. Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1	$ 1	$ 1	$ 1
Interest cost	42	40	84	81
Expected return on plan assets	(48)	(48)	(96)	(96)
Amortization
Actuarial loss	10	15	21	31
Prior service credit	(1)	0	(2)	(1)
Settlement and curtailment loss	0	0	0	0
Net periodic benefit cost (credit)	4	8	8	16
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	1	3	3
Interest cost	5	4	9	8
Expected return on plan assets	(3)	(2)	(6)	(5)
Amortization
Actuarial loss	1	1	3	3
Prior service credit	0	0	0	0
Settlement and curtailment loss	2	1	2	1
Net periodic benefit cost (credit)	7	5	11	10
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	1	1	2
Interest cost	6	4	12	9
Expected return on plan assets	0	0	0	0
Amortization
Actuarial loss	0	0	0	0
Prior service credit	(9)	(9)	(19)	(19)
Settlement and curtailment loss	0	0	0	0
Net periodic benefit cost (credit)	$ (3)	$ (4)	$ (6)	$ (8)