Pension and Other Benefit Plans - Defined Benefit Plan Weighted Average Assumptions Used in Calculating Benefit Obligation and Net Periodic Benefit Cost For US Postretirement Medical Plan (Detail)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.25%	5.50%
Current medical cost trend rate	7.50%	7.50%
Ultimate medical cost trend rate	4.50%	4.50%
Year that the rate reaches the ultimate trend rate	2035	2035
Postretirement medical plan
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.50%	3.00%	2.60%
Return on plan assets	4.41%	2.94%	6.21%
Current medical cost trend rate	7.50%	6.75%	7.00%
Ultimate medical cost trend rate	4.50%	4.50%	4.50%
Year that the rate reaches the ultimate trend rate	2035	2031	2031