Income Taxes (Net Deferred Income Tax Assets and Liabilities) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Tax Examination [Line Items]
Employee benefits	$ 273	$ 275
Contingent and accrued liabilities	61	67
Operating loss and other carry-forwards	279	218
Operating lease liabilities	203	203
Research and development amortization	214	149
Other	201	168
Valuation allowance	249	182
Deferred tax assets, net of valuation allowance	982	898
Property	223	223
Intangibles	696	720
Employee benefits	47	81
Operating lease right-of-use assets	207	206
Other	44	74
Deferred tax liabilities, gross	1,217	1,304
Deferred tax liabilities, net	235	406
Net operating loss carryforwards	158	150
Income tax credit carryforwards	108	89
Income tax, potential U.S. tax cost for repatriation of foreign earnings	123
Deferred income tax assets related to
Employee benefits	273	275
Contingent and accrued liabilities	61	67
Operating loss and other carry-forwards	279	218
Operating lease liabilities	203	203
Research and development amortization	214	149
Other	201	168
Valuation allowance	(249)	(182)
Total	982	898
Deferred income tax liabilities related to
Property	223	223
Intangibles	696	720
Employee benefits	47	81
Operating lease right-of-use assets	207	206
Other	44	74
Total	1,217	1,304
Deferred income tax liabilities – net	$ (235)	(406)
Minimum
Income Tax Examination [Line Items]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2024
Tax Credit Carryforward, Expiration Date	Dec. 31, 2024
Maximum
Income Tax Examination [Line Items]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2043
Tax Credit Carryforward, Expiration Date	Dec. 31, 2043
Net Operating Loss, Indefinite Life
Income Tax Examination [Line Items]
Net operating loss carryforwards	$ 86	84
Net Operating Loss, Expiring Within 20 Years
Income Tax Examination [Line Items]
Net operating loss carryforwards	$ 72	$ 66