Pension, Other Postretirement Benefits and Savings Plans - Benefit Costs and Amounts Recognized in Other Comprehensive (Income) Loss (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Postretirement Benefits
Benefits cost:
Service cost		$ 4	$ 3	$ 3
Interest cost		13	12	15
Expected return on plan assets		(1)	0	0
Amortization of prior service cost (credit)		(29)	(45)	(45)
Amortization of net losses		6	5	7
Net periodic cost		(7)	(25)	(20)
Curtailments/settlements/termination benefits		0	2	0
Total benefits cost		(7)	(23)	(20)
Recognized in other comprehensive (income) loss before tax and minority:
Prior service (credit) cost from plan amendments		3	0	0
Increase (decrease) in net actuarial losses		(15)	(1)	(19)
Amortization of prior service (cost) credit in net periodic cost		29	45	45
Amortization of net losses in net periodic cost		(6)	(5)	(7)
Immediate recognition of prior service cost and unrecognized gains and losses due to curtailments, settlements, and divestitures		0	0	4
Deconsolidation of Venezuelan subsidiary		0	0	0
Total recognized in other comprehensive loss (income) before tax and minority		11	39	23
Total recognized in total benefits cost and other comprehensive loss (income) before tax and minority		4	16	3
United States | Pension Plan
Benefits cost:
Service cost		4	5	4
Interest cost		160	164	238
Expected return on plan assets		(241)	(255)	(295)
Amortization of prior service cost (credit)		0	0	0
Amortization of net losses		111	109	106
Net periodic cost		34	23	53
Curtailments/settlements/termination benefits	$ 137	29	0	137
Total benefits cost		63	23	190
Recognized in other comprehensive (income) loss before tax and minority:
Prior service (credit) cost from plan amendments		0	0	0
Increase (decrease) in net actuarial losses		128	81	150
Amortization of prior service (cost) credit in net periodic cost		0	0	0
Amortization of net losses in net periodic cost		(111)	(109)	(106)
Immediate recognition of prior service cost and unrecognized gains and losses due to curtailments, settlements, and divestitures		(29)	0	(386)
Deconsolidation of Venezuelan subsidiary		0	0	0
Total recognized in other comprehensive loss (income) before tax and minority		(12)	(28)	(342)
Total recognized in total benefits cost and other comprehensive loss (income) before tax and minority		51	(5)	(152)
United States | Other Postretirement Benefits
Benefits cost:
Total benefits cost		(17)	(31)	(28)
Non-U.S. | Pension Plan
Benefits cost:
Service cost		31	29	43
Interest cost		71	80	113
Expected return on plan assets		(80)	(88)	(107)
Amortization of prior service cost (credit)		0	0	1
Amortization of net losses		32	27	32
Net periodic cost		54	48	82
Curtailments/settlements/termination benefits		3	16	2
Total benefits cost		57	64	84
Recognized in other comprehensive (income) loss before tax and minority:
Prior service (credit) cost from plan amendments		3	0	0
Increase (decrease) in net actuarial losses		25	35	(45)
Amortization of prior service (cost) credit in net periodic cost		0	0	(1)
Amortization of net losses in net periodic cost		(29)	(27)	(34)
Immediate recognition of prior service cost and unrecognized gains and losses due to curtailments, settlements, and divestitures		(12)	(17)	(5)
Deconsolidation of Venezuelan subsidiary		0	0	(62)
Total recognized in other comprehensive loss (income) before tax and minority		(13)	(9)	(147)
Total recognized in total benefits cost and other comprehensive loss (income) before tax and minority		44	55	(63)
Non-U.S. | Other Postretirement Benefits
Benefits cost:
Total benefits cost		$ 10	$ 8	$ 8