Basis of Presentation and Summary of Significant Accounting Policies (Schedule of Subscriber System Assets, net) (Details) - USD ($) $ in Millions |
Mar. 31, 2016 |
Sep. 25, 2015 |
|---|---|---|
| Subscriber System Assets, net [Abstract] | ||
| Subscriber System Assets, Gross carrying amount | $ 5,391 | $ 5,124 |
| Subscriber System Assets, Accumulated Depreciation | (2,781) | (2,622) |
| Subscriber System Assets, net | $ 2,610 | $ 2,502 |