Pension, Other Postretirement Benefits and Savings Plans - Changes in Fair Value of Non-U.S. Pension Plan Insurance Contracts (Details) - Foreign Plan [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance	$ 360
Ending balance	445	$ 360
Pension Plan [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance	2,043	3,272
Foreign currency translation	88	(285)
Ending balance	2,146	2,043
Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance	20
Ending balance	21	20
Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Defined Benefit Plan Alternatives Insurance Contracts [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance	20	25
Unrealized gains relating to instruments still held at the reporting date	1	(3)
Foreign currency translation	0	(2)
Ending balance	$ 21	$ 20