Retirement and Other Benefit Plans - Change in Projected Benefit Obligation (Detail) - Pension - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Net projected benefit obligation at beginning of year	$ 970	$ 858
Service cost	38	33	$ 48
Interest cost	55	51	41
Actuarial (gain) loss	(46)	73
Gross benefits paid	(50)	(45)
Net projected benefit obligation at end of year	$ 967	$ 970	$ 858