Insurance Premiums (Narrative) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022
Insurance Premiums [Line Items]
Weighted average risk-free rate		3.00%	2.90%
Weighted average expected collection term of the premiums receivable, years		8 years 9 months	8 years 11 months 12 days
Reinsurance premiums payable	[1]	$ 12
Premiums [Member]
Insurance Premiums [Line Items]
Reinsurance premiums payable		$ 4	$ 4

[1] Total reinsurance recoverable/(payable) is primarily related to recoverables on paid and unpaid losses net of paid and unpaid salvage due to reinsurers