Share-Based Compensation (Narrative) (Detail) shares in Millions	3 Months Ended
	Mar. 31, 2022 shares
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock that will be made available for sale, in shares	5.0
Share-based compensation arrangement, term of plan	Jul. 01, 2023
Amended Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock that will be made available for sale, in shares	14.0
Share-based compensation arrangement, term of plan	Jul. 01, 2032