Retirement Plans - Amounts Recognized in Balance Sheet for Pension Plans & Postretirement Medical Plan (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	$ 685	$ 648
Accumulated other comprehensive (gain) loss related to retirement plans, after-tax - Deficit	134	131
Funded Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	685	648
Current liabilities	0	0
Noncurrent liabilities	0	0
Post-retirement benefit assets / (liabilities)	685	648
Accumulated other comprehensive loss, pre-tax	332	337
Unfunded Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	0	0
Current liabilities	(23)	(24)
Noncurrent liabilities	(199)	(188)
Post-retirement benefit assets / (liabilities)	(222)	(212)
Accumulated other comprehensive loss, pre-tax	30	23
Postretirement Medical Plan
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	0	0
Current liabilities	(5)	(6)
Noncurrent liabilities	(48)	(46)
Post-retirement benefit assets / (liabilities)	(53)	(52)
Accumulated other comprehensive loss, pre-tax	$ (25)	$ (27)