Employee Benefit Plans - Plan's Assets Carried at Fair Value (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Total fair value measurements	$ 0	$ 6
Annuity Contract [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value measurements	0	3
Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value measurements	0	3
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value measurements	0	0
Level 1 [Member] | Annuity Contract [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value measurements	0	0
Level 1 [Member] | Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value measurements	0	0
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value measurements	0	3
Level 2 [Member] | Annuity Contract [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value measurements	0	0
Level 2 [Member] | Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value measurements	0	3
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value measurements	0	3
Level 3 [Member] | Annuity Contract [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value measurements	0	3
Level 3 [Member] | Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value measurements	$ 0	$ 0