Retirement Plans - Amounts Recognized in Balance Sheet for Pension Plans & Postretirement Medical Plan (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	$ 648	$ 409
Accumulated other comprehensive (gain) loss related to retirement plans, after-tax - Deficit	131	338
Funded Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	648	409
Current liabilities	0	0
Noncurrent liabilities	0	0
Pension assets / (accrued benefit liability)	648	409
Accumulated other comprehensive loss, pre-tax	337	501
Unfunded Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	0	0
Current liabilities	(24)	(34)
Noncurrent liabilities	(188)	(214)
Pension assets / (accrued benefit liability)	(212)	(248)
Accumulated other comprehensive loss, pre-tax	23	66
Postretirement Medical Plan
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	0	0
Current liabilities	(6)	(6)
Noncurrent liabilities	(46)	(53)
Pension assets / (accrued benefit liability)	(52)	(59)
Accumulated other comprehensive loss, pre-tax	$ (27)	$ (21)