Employee Postretirement Benefits - Schedule of Amounts Recognized in Balance Sheet (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	$ 10	$ 0
Accrued benefit costs and other current liabilities	0	(7)
Deferred credits and other liabilities	(1)	(9)
Net amount recognized at end of year	9	(16)
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	0	0
Accrued benefit costs and other current liabilities	(10)	(12)
Deferred credits and other liabilities	(99)	(121)
Net amount recognized at end of year	$ (109)	$ (133)