Pension, Other Postretirement Benefits and Savings Plans - Changes in Benefit Obligation and Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Change in benefit obligation:
Curtailments/settlements/termination benefits	$ 40	$ 124	$ 43
UNITED STATES
Change in plan assets:
Beginning balance	202
Ending balance	203	202
Foreign Plan [Member]
Change in plan assets:
Beginning balance	360
Ending balance	445	360
Pension Plan [Member]
Change in benefit obligation:
Service cost — benefits earned	(37)
Actuarial loss	16
Pension Plan [Member] | UNITED STATES
Change in benefit obligation:
Beginning balance	(4,084)	(5,798)
Service cost — benefits earned	(8)	(13)	(9)
Interest cost	(195)	(133)	(94)
Plan amendments	0	(6)
Actuarial loss	(98)	1,282
Participant contributions	0	0
Curtailments/settlements/termination benefits	355	233
Foreign currency translation	0	0
Benefit payments	371	351
Ending balance	(3,659)	(4,084)	(5,798)
Change in plan assets:
Beginning balance	4,174	5,720
Actual return on plan assets	290	(969)
Company contributions to plan assets		0
Company contributions to plan assets	(18)
Cash funding of direct participant payments	4	7
Participant contributions	0	0
Settlements	(355)	(233)
Foreign currency translation	0	0
Benefit payments	(371)	(351)
Ending balance	3,724	4,174	5,720
Funded status at end of year	65	90
Pension Plan [Member] | Foreign Plan [Member]
Change in benefit obligation:
Beginning balance	(2,227)	(3,464)
Service cost — benefits earned	(18)	(24)	(30)
Interest cost	(108)	(60)	(47)
Plan amendments	0	1
Actuarial loss	(116)	881
Participant contributions	(3)	(3)
Curtailments/settlements/termination benefits	21	6
Foreign currency translation	(83)	287
Benefit payments	142	149
Ending balance	(2,392)	(2,227)	(3,464)
Change in plan assets:
Beginning balance	2,043	3,272
Actual return on plan assets	102	(845)
Company contributions to plan assets	42	32
Cash funding of direct participant payments	26	21
Participant contributions	3	3
Settlements	(16)	(6)
Foreign currency translation	88	(285)
Benefit payments	(142)	(149)
Ending balance	2,146	2,043	3,272
Funded status at end of year	(246)	(184)
Other Postretirement Benefits Plan [Member]
Change in benefit obligation:
Beginning balance	(292)	(406)
Service cost — benefits earned	(2)	(3)	(3)
Interest cost	(16)	(12)	(9)
Plan amendments	0	0
Actuarial loss	(1)	103
Participant contributions	(7)	(8)
Curtailments/settlements/termination benefits	0	0
Foreign currency translation	(1)	5
Benefit payments	32	29
Ending balance	(287)	(292)	(406)
Change in plan assets:
Beginning balance	0	0
Actual return on plan assets	0	0
Company contributions to plan assets	0	0
Cash funding of direct participant payments	25	21
Participant contributions	7	8
Settlements	0	0
Foreign currency translation	0	0
Benefit payments	(32)	(29)
Ending balance	0	0	$ 0
Funded status at end of year	(287)	(292)
Other Postretirement Benefits Plan [Member] | UNITED STATES
Change in plan assets:
Funded status at end of year	195	205
Other Postretirement Benefits Plan [Member] | Foreign Plan [Member]
Change in plan assets:
Funded status at end of year	$ 92	$ 87