Retirement Plans - Components of Net Periodic Benefit Cost for Pension Plans & Postretirement Medical Plan (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Settlement loss	$ 2	$ 9	$ 0
Net non-service pension (income) costs included in Other, net	(114)	(75)	(59)
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	44	51	50
Interest cost	69	55	73
Expected return on plan assets	(196)	(197)	(180)
Amortization of unrecognized net actuarial losses (gains)	11	58	48
Settlement loss	2	9	0
Net Periodic Benefit Cost	(70)	(24)	(9)
Postretirement Medical Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	3	3
Interest cost	1	1	1
Expected return on plan assets	0	0	0
Amortization of unrecognized net actuarial losses (gains)	(1)	(1)	(1)
Settlement loss	0	0	0
Net Periodic Benefit Cost	$ 3	$ 3	$ 3