Financial Instruments (Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments not Recorded at Fair Value) (Details) - USD ($) $ in Millions |
Sep. 24, 2016 |
Dec. 26, 2015 |
|---|---|---|
| Carrying Amount | ||
| Short-term debt | $ 0 | $ 230 |
| Long-term debt | 1,630 | 2,000 |
| Estimated Fair Value | ||
| Unamortized debt issuance costs | 26 | 25 |
| Level 2 | ||
| Estimated Fair Value | ||
| Short-term debt | 0 | 230 |
| Long-term debt | 1,990 | $ 1,372 |
| 2.125% Convertible Senior Notes due 2026 | Convertible Debt | ||
| Estimated Fair Value | ||
| Unamortized debt discount | $ 273 |