Postretirement Benefit Plans - Expense Related to Defined Benefit and Retiree Health Care Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
U.S. defined benefit plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 22	$ 22	$ 21
Interest cost	42	43	45
Expected return on plan assets	(41)	(48)	(42)
Amortization of prior service cost (credit)	0	0	0
Recognized net actuarial loss	21	19	26
Net periodic benefit costs	44	36	50
Settlement losses	21	25	5
Curtailment gain	0	0	0
Total, including other postretirement losses (gains)	65	61	55
U.S. retiree health care plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	5	4
Interest cost	20	20	22
Expected return on plan assets	(20)	(22)	(20)
Amortization of prior service cost (credit)	(3)	2	4
Recognized net actuarial loss	7	8	7
Net periodic benefit costs	9	13	17
Settlement losses	0	0	0
Curtailment gain	0	0	0
Total, including other postretirement losses (gains)	9	13	17
Non-U.S. defined benefit plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	34	35	39
Interest cost	52	53	68
Expected return on plan assets	(68)	(76)	(80)
Amortization of prior service cost (credit)	(2)	(2)	(2)
Recognized net actuarial loss	25	24	24
Net periodic benefit costs	41	34	49
Settlement losses	2	2	1
Curtailment gain	0	0	(2)
Total, including other postretirement losses (gains)	$ 43	$ 36	$ 48