Redeemable Convertible Notes (Details) - USD ($) $ in Millions |
Dec. 03, 2015 |
Sep. 03, 2015 |
|---|---|---|
| Debt Instrument [Line Items] | ||
| Redeemable convertible notes | $ 42 | $ 49 |
| 2033E and 2033F convertible senior notes [Member] | ||
| Debt Instrument [Line Items] | ||
| Redeemable convertible notes | $ 42 | $ 49 |