Retirement Plans - Additional Information (Detail) £ in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 GBP (£)
Retirement Benefits [Abstract]
Premium paid to purchase a bulk annuity policy for the U.K. pension plan | £					£ 361
Change in funded status recognized upon interim remeasurement for the U.K. pension plan	$ 77		$ 77
Pension prior service cost	35	$ 0	35	$ 0
(Increase) reduction in unrecognized actuarial losses	42	$ 0	67	$ 13
Funded status (plan assets greater than benefit obligations) for the U.K. pension plan	85		85
Unrecognized net actuarial losses related to the U.K. pension plan	$ 219		$ 219