Retirement Plans - Amounts Recognized in Balance Sheet for Pension Plans & Postretirement Medical Plan (Detail) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	$ 655	$ 685
Accumulated other comprehensive (gain) loss related to retirement plans, after-tax - Deficit	208	134
Funded Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	655	685
Current liabilities	0	0
Noncurrent liabilities	0	0
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position, Total	655	685
Accumulated other comprehensive loss, pre-tax	372	332
Unfunded Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	0	0
Current liabilities	(15)	(23)
Noncurrent liabilities	(264)	(199)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position, Total	(279)	(222)
Accumulated other comprehensive loss, pre-tax	71	30
Postretirement Medical Plan
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	0	0
Current liabilities	(4)	(5)
Noncurrent liabilities	(52)	(48)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position, Total	(56)	(53)
Accumulated other comprehensive loss, pre-tax	$ (23)	$ (25)