Restructuring - Additional Information (Detail) - Reorganization Actions [Member] - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021
Restructuring Cost And Reserve [Line Items]
Severance costs	$ 24	$ 22
Accrued severance charges	4
Restructuring charges expected throughout rest of 2022 related to site demolition costs	1
Restructuring charges expected thereafter fiscal year related to severance and site demolition costs	2
Restructuring cash payments of fiscal year	19	$ 18
Restructuring cash payments through the reminder of fiscal 2022	4
Restructuring future cash payments thereafter fiscal year	$ 3