Commitments and Contingencies - Summary of Additional Information Related to Operating Lease Agreements (Details) $ in Millions	12 Months Ended
	Mar. 31, 2022 USD ($)
Commitments And Contingencies Disclosure [Abstract]
ROU assets	$ 97
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets
Weighted average remaining lease term (in years)	8 years 3 months 18 days
Weighted average discount rate	2.76%
Cash paid for amounts included in the measurement of lease liabilities - operating cash flows	$ 26