Pension, Savings and Other Postretirement Benefit Plans - Changes in Fair Value of Non-U.S. Pension Plan Insurance Contracts (Details) - Non-U.S. - Pension Plans - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance	$ 1,906	$ 2,146
Foreign currency translation	(134)	79
Ending balance	1,964	1,906
Significant Unobservable Inputs (Level 3) | Alternatives, Insurance Contracts
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance	23	21
Purchases, sales, issuance and settlements (net)	0	2
Unrealized gains relating to instruments still held at the reporting date	(1)	1
Foreign currency translation	2	(1)
Ending balance	$ 24	$ 23