Leases - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended
	Jun. 30, 2020	Oct. 30, 2020
Leases [Line Items]
Future undiscounted payments		$ 142
Build-to-suit Office Building
Leases [Line Items]
Operating remaining lease term	20 years
Future undiscounted payments	$ 67
Operating lease, existence of option to extend	true
Maximum | Real Estate
Leases [Line Items]
Operating remaining lease term		15 years
Maximum | Equipment
Leases [Line Items]
Operating remaining lease term		4 years
Maximum | Automobiles
Leases [Line Items]
Operating remaining lease term		5 years