Debt (Convertible Debt) (Details) - Convertible Debt - 2.125% Convertible Senior Notes due 2026 - USD ($) $ in Millions |
Sep. 24, 2016 |
Sep. 14, 2016 |
|---|---|---|
| Debt Instrument [Line Items] | ||
| Principal | $ 700 | $ 700 |
| Unamortized debt discount | (273) | |
| Unamortized debt issuance costs | (12) | |
| Net carrying amount | 415 | |
| Carrying amount of the equity component | 266 | |
| Equity issuance costs | $ 8 |