Restructuring - Additional Information (Detail) - 2019 Restructuring Plan [Member] $ in Millions	1 Months Ended
	Dec. 31, 2019 USD ($)
Restructuring Cost And Reserve [Line Items]
Restructuring program benefits realised period	2023
Minimum [Member]
Restructuring Cost And Reserve [Line Items]
Pre-tax restructuring charges	$ 350
Reduction in annual pre-tax operating expenses	200
Maximum [Member]
Restructuring Cost And Reserve [Line Items]
Pre-tax restructuring charges	400
Reduction in annual pre-tax operating expenses	$ 300