Pension and Other Postretirement Benefits (Additional Information) (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 15
Other Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Benefits paid	12
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Benefits paid	$ 42