Postretirement Benefit Plans - Expense Related to Defined Benefit and Retiree Health Care Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
U.S. defined benefit plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 5	$ 5
Interest cost	10	11
Expected return on plan assets	(10)	(10)
Recognized net actuarial loss	4	5
Amortization of prior service credit	0	0
Net periodic benefit costs	9	11
Settlement losses	6	6
Total, including other postretirement losses	15	17
U.S. retiree health care plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1
Interest cost	4	5
Expected return on plan assets	(4)	(5)
Recognized net actuarial loss	1	2
Amortization of prior service credit	(1)	(1)
Net periodic benefit costs	1	2
Settlement losses	0	0
Total, including other postretirement losses	1	2
Non-U.S. defined benefit plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	9	8
Interest cost	11	13
Expected return on plan assets	(16)	(17)
Recognized net actuarial loss	7	6
Amortization of prior service credit	0	0
Net periodic benefit costs	11	10
Settlement losses	0	1
Total, including other postretirement losses	$ 11	$ 11