Pension, Other Postretirement Benefits and Savings Plans - Changes in Benefit Obligation and Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Change in benefit obligation:
Curtailments/settlements/termination benefits	$ 17	$ 139	$ 39
U.S.
Change in benefit obligation:
Beginning balance	(5,338)	(6,507)
Newly adopted plans	0	0
Service cost — benefits earned	(5)	(4)	(15)
Interest cost	(164)	(238)	(256)
Actuarial gain (loss)	(171)	262
Participant contributions	0	0
Curtailments/settlements/termination benefits	1	285
Divestitures	0	500
Deconsolidation of Venezuelan subsidiary	0	0
Foreign currency translation	0	0
Benefit payments	392	364
Ending balance	(5,285)	(5,338)	(6,507)
Change in plan assets:
Beginning balance	5,011	6,250
Newly adopted plans	0	0
Actual return on plan assets	345	(117)
Company contributions to plan assets	0	0
Cash funding of direct participant payments	9	7
Participant contributions	0	0
Settlements	(1)	(285)
Divestitures	0	(480)
Foreign currency translation	0	0
Benefit payments	(392)	(364)
Ending balance	4,972	5,011	6,250
Funded status at end of year	(313)	(327)
Non-U.S.
Change in benefit obligation:
Beginning balance	(2,808)	(3,178)
Newly adopted plans	(2)	(9)
Service cost — benefits earned	(29)	(43)	(34)
Interest cost	(80)	(113)	(131)
Actuarial gain (loss)	(384)	(5)
Participant contributions	(2)	(2)
Curtailments/settlements/termination benefits	52	19
Divestitures	0	0
Deconsolidation of Venezuelan subsidiary	0	80
Foreign currency translation	262	303
Benefit payments	128	140
Ending balance	(2,863)	(2,808)	(3,178)
Change in plan assets:
Beginning balance	2,493	2,721
Newly adopted plans	1	9
Actual return on plan assets	393	60
Company contributions to plan assets	56	60
Cash funding of direct participant payments	24	36
Participant contributions	2	2
Settlements	(51)	(18)
Divestitures	0	0
Foreign currency translation	(283)	(237)
Benefit payments	(128)	(140)
Ending balance	2,507	2,493	2,721
Funded status at end of year	(356)	(315)
Other Postretirement Benefits
Change in benefit obligation:
Beginning balance	(291)	(361)
Newly adopted plans	0	0
Service cost — benefits earned	(3)	(3)	(4)
Interest cost	(12)	(15)	(19)
Actuarial gain (loss)	0	22
Participant contributions	(13)	(15)
Curtailments/settlements/termination benefits	(2)	0
Divestitures	0	6
Deconsolidation of Venezuelan subsidiary	0	0
Foreign currency translation	(10)	35
Benefit payments	37	40
Ending balance	(294)	(291)	(361)
Change in plan assets:
Beginning balance	3	5
Newly adopted plans	0	0
Actual return on plan assets	1	0
Company contributions to plan assets	2	2
Cash funding of direct participant payments	22	23
Participant contributions	13	15
Settlements	0	0
Divestitures	0	0
Foreign currency translation	0	(2)
Benefit payments	(37)	(40)
Ending balance	4	3	$ 5
Funded status at end of year	$ (290)	$ (288)