Summary of Significant Accounting Policies (Summary Of Components Of Available-For-Sale Securities) (Details) - USD ($) $ in Millions |
Jan. 02, 2016 |
Jan. 03, 2015 |
|---|---|---|
| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] | ||
| Adjusted cost | $ 5 | $ 6 |
| Gross unrealized gains | 6 | 24 |
| Gross unrealized losses | (1) | 0 |
| Other Current Assets [Member] | ||
| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] | ||
| Available-for-sale securities | $ 10 | $ 30 |