Debt Investment Maturities (Detail) $ in Millions |
Mar. 31, 2016
USD ($)
|
|---|---|
| Cost Basis | |
| Due in one year or less | $ 43,753 |
| Due after one year through five years | 53,372 |
| Due after five years through 10 years | 2,266 |
| Due after 10 years | 1,216 |
| Total | 100,607 |
| Estimated Fair Value | |
| Due in one year or less | 43,745 |
| Due after one year through five years | 53,453 |
| Due after five years through 10 years | 2,275 |
| Due after 10 years | 1,280 |
| Total | $ 100,753 |