Income Taxes (Net Deferred Income Tax Assets and Liabilities) (Detail) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Income Tax Examination [Line Items]
Employee benefits	$ 203	$ 215
Contingent and accrued liabilities	98	105
Operating loss and other carry-forwards	324	389
Operating lease liabilities	145	144
Research and development amortization	304	259
Other	258	280
Valuation allowance	258	327
Deferred tax assets, net of valuation allowance	1,074	1,065
Property	201	268
Intangibles	643	607
Employee benefits	43	39
Operating lease right-of-use assets	150	148
Other	13	105
Deferred tax liabilities, gross	1,050	1,167
Deferred tax assets, net	24
Deferred tax liabilities, net		102
Net operating loss carryforwards	190	235
Income tax credit carryforwards	128	112
Income tax, potential U.S. tax cost for repatriation of foreign earnings	167
Deferred income tax assets related to
Employee benefits	203	215
Contingent and accrued liabilities	98	105
Operating loss and other carry-forwards	324	389
Operating lease liabilities	145	144
Research and development amortization	304	259
Other	258	280
Valuation allowance	(258)	(327)
Total	1,074	1,065
Deferred income tax liabilities related to
Property	201	268
Intangibles	643	607
Employee benefits	43	39
Operating lease right-of-use assets	150	148
Other	13	105
Total	1,050	1,167
Deferred income tax assets/(liabilities) – net		(102)
Net Operating Loss, Indefinite Life
Income Tax Examination [Line Items]
Net operating loss carryforwards	95	85
Net Operating Loss, Expiring Within 20 Years
Income Tax Examination [Line Items]
Net operating loss carryforwards	$ 95	$ 150