Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Foreign currency:
Tax on foreign currency translation	$ 0	$ (7)	$ 2
Tax on reclassification adjustment for amounts recognized in come	0	0	0
Defined benefit plans:
Tax on amortization of prior service cost and unrecognized gains and losses included in total benefit cost	4	27	26
Tax on decrease/(increase) in net actuarial losses	(4)	0	(36)
Tax on immediate recognition of prior service cost and unrecognized gains and losses due to curtailments, settlements, and divestitures	0	(1)	11
Tax on prior service credit (cost) from plan amendments	0	8	0
Deferred derivative gain:
Tax on deferred derivative losses	0	0	0
Tax on reclassification adjustment for amounts recognized in income	$ 0	$ 0	$ 0