Income Taxes - Deferred tax assets (liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Deferred tax assets:
Contingent liabilities	$ 15	$ 56
Net operating loss	1,000	962
Tax credits	64	54
Capital loss	140	241
Leases	123	132
Investment in partnerships	81	135
Other	76	87
Total deferred tax assets	1,499	1,667
Less: Valuation allowance	(722)	(908)
Net deferred tax assets	777	759
Deferred tax liabilities:
Property, plant and equipment	(336)	(364)
Intangible assets	(55)	(60)
Investment in partnerships	(173)	(161)
Investment in U.S. subsidiaries	(163)	(163)
Leases	(118)	(129)
Other	(81)	(53)
Total deferred tax liabilities	(926)	(930)
Deferred tax liabilities, net of deferred tax assets	$ (149)	$ (171)