Income Taxes - Components of Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets
Post-retirement and pension benefit costs	$ 583	$ 659
Net operating loss carryforwards	649	794
Other employee benefits	22	23
Other	744	511
Gross deferred tax assets	1,998	1,987
Less valuation allowance	(343)	(399)
Net deferred tax assets	1,655	1,588
Deferred tax liabilities
Property, plant and equipment, primarily due to depreciation differences	(3,447)	(3,332)
Goodwill and other intangible assets	(1,002)	(1,271)
Gross deferred tax liabilities	(4,449)	(4,603)
Net deferred tax liability	$ (2,794)	$ (3,015)