Debt Investment Maturities (Detail) $ in Millions	Sep. 30, 2023 USD ($)
Adjusted Cost Basis
Due in one year or less	$ 13,575
Due after one year through five years	46,882
Due after five years through 10 years	11,489
Due after 10 years	1,326
Debt investments, Adjusted Cost Basis	73,272
Estimated Fair Value
Due in one year or less	13,451
Due after one year through five years	44,003
Due after five years through 10 years	9,801
Due after 10 years	1,153
Total	$ 68,408