Notional Amounts of Outstanding Derivative Instruments and Credit Risk Amounts Associated with Outstanding or Unsettled Derivative Instruments (Detail) - USD ($) $ in Millions |
Mar. 26, 2016 |
Sep. 26, 2015 |
|---|---|---|
| Derivatives Designated as Hedging Instruments | Foreign exchange contracts | ||
| Derivative [Line Items] | ||
| Notional Amount | $ 41,996 | $ 70,054 |
| Credit Risk | 564 | 1,385 |
| Derivatives Designated as Hedging Instruments | Interest rate contracts | ||
| Derivative [Line Items] | ||
| Notional Amount | 23,750 | 18,750 |
| Credit Risk | 557 | 394 |
| Not Designated as Hedging Instrument | Foreign exchange contracts | ||
| Derivative [Line Items] | ||
| Notional Amount | 30,573 | 49,190 |
| Credit Risk | $ 69 | $ 109 |