Pensions Benefit Plans and Other Postretirement Benefits - Changes in the Benefit Obligation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pension Benefit Plans | U.S.
Changes in the pension and postretirement benefit obligations
Obligations at beginning of year	$ 1,413	$ 1,650
Change in benefit obligations:
Service cost	12	14	$ 14
Interest cost	58	59	78
Actuarial (gain) loss, including the effect of change in discount rates	144	(108)
Settlements	(35)	(114)
Benefit payments	(87)	(91)
Other		3
Net change in benefit obligations	92	(237)
Obligations at end of year	1,505	1,413	1,650
Pension Benefit Plans | Non-U.S.
Changes in the pension and postretirement benefit obligations
Obligations at beginning of year	1,022	1,148
Change in benefit obligations:
Service cost	12	15	15
Interest cost	33	32	40
Actuarial (gain) loss, including the effect of change in discount rates	116	(23)
Settlements	(44)	(35)
Acquisitions	30
Participant contributions	1	2
Benefit payments	(37)	(51)
Other	(6)	(2)
Foreign currency translation	23	(64)
Net change in benefit obligations	128	(126)
Obligations at end of year	1,150	1,022	1,148
Other Postretirement Benefits | U.S.
Changes in the pension and postretirement benefit obligations
Obligations at beginning of year	74	89
Change in benefit obligations:
Interest cost	4	3	4
Actuarial (gain) loss, including the effect of change in discount rates	3	(9)
Benefit payments	(9)	(9)
Net change in benefit obligations	(2)	(15)
Obligations at end of year	72	74	89
Other Postretirement Benefits | Non-U.S.
Changes in the pension and postretirement benefit obligations
Obligations at beginning of year	80	89
Change in benefit obligations:
Service cost	1	1	1
Interest cost	3	3	3
Actuarial (gain) loss, including the effect of change in discount rates	(15)	(4)
Benefit payments	(2)	(2)
Foreign currency translation	4	(7)
Net change in benefit obligations	(9)	(9)
Obligations at end of year	$ 71	$ 80	$ 89