Pension and Other Postretirement Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
United States Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 1	$ 1	$ 1
Interest cost	37	42	75	84
Expected return on plan assets	(47)	(48)	(95)	(96)
Amortization:
Actuarial loss	14	10	27	21
Prior service credit	(1)	(1)	(2)	(2)
Settlement and curtailment loss	0	0	0	0
Net periodic benefit cost (credit)	3	4	6	8
Foreign Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	2	3	3
Interest cost	7	5	15	9
Expected return on plan assets	(9)	(3)	(17)	(6)
Amortization:
Actuarial loss	2	1	3	3
Prior service credit	0	0	0	0
Settlement and curtailment loss	4	2	12	2
Net periodic benefit cost (credit)	6	7	16	11
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	1	1
Interest cost	5	6	10	12
Expected return on plan assets	0	0	0	0
Amortization:
Actuarial loss	0	0	0	0
Prior service credit	(5)	(9)	(14)	(19)
Settlement and curtailment loss	0	0	(47)	0
Net periodic benefit cost (credit)	$ 0	$ (3)	$ (50)	$ (6)