Notional Amounts of Outstanding Derivative Instruments and Credit Risk Amounts Associated with Outstanding or Unsettled Derivative Instruments (Detail) - USD ($) $ in Millions |
Dec. 26, 2015 |
Sep. 26, 2015 |
|---|---|---|
| Derivatives Designated as Hedging Instruments | Foreign exchange contracts | ||
| Derivative [Line Items] | ||
| Notional Amount | $ 59,305 | $ 70,054 |
| Credit Risk | 1,021 | 1,385 |
| Derivatives Designated as Hedging Instruments | Interest rate contracts | ||
| Derivative [Line Items] | ||
| Notional Amount | 18,750 | 18,750 |
| Credit Risk | 313 | 394 |
| Not Designated as Hedging Instrument | Foreign exchange contracts | ||
| Derivative [Line Items] | ||
| Notional Amount | 48,365 | 49,190 |
| Credit Risk | $ 275 | $ 109 |