Debt Investment Maturities (Detail) $ in Millions	Sep. 30, 2025 USD ($)
Adjusted Cost Basis
Due in one year or less	$ 37,304
Due after one year through five years	48,228
Due after five years through 10 years	5,397
Due after 10 years	1,472
Debt investments, Adjusted Cost Basis	92,401
Estimated Fair Value
Due in one year or less	37,200
Due after one year through five years	47,466
Due after five years through 10 years	5,877
Due after 10 years	1,397
Total	$ 91,940