Debt Investment Maturities (Detail) $ in Millions	Mar. 31, 2022 USD ($)
Adjusted Cost Basis
Due in one year or less	$ 20,401
Due after one year through five years	56,463
Due after five years through 10 years	18,807
Due after 10 years	1,377
Debt investments, Adjusted Cost Basis	97,048
Estimated Fair Value
Due in one year or less	20,496
Due after one year through five years	56,076
Due after five years through 10 years	18,049
Due after 10 years	1,349
Total	$ 95,970