Debt Investment Maturities (Detail) $ in Millions	Sep. 30, 2024 USD ($)
Adjusted Cost Basis
Due in one year or less	$ 24,446
Due after one year through five years	37,153
Due after five years through 10 years	7,338
Due after 10 years	1,419
Debt investments, Adjusted Cost Basis	70,356
Estimated Fair Value
Due in one year or less	24,331
Due after one year through five years	35,927
Due after five years through 10 years	6,865
Due after 10 years	1,334
Total	$ 68,457