Several sites report that $4 million of his 2017 salary is fully guaranteed now, and another $4 million in 2017 is guaranteed against injury. This would be consistent with the reports that there was $22 million guaranteed at the time of signing ($11M signing bonus, $7M 2016 salary and $4M 2017 salary). If true, the Broncos would be on the hook for at least $7 million this year and $4 million next year.
Edit- Over the Cap lists the Eagles cap hit to release him pre-June this year at $22M, which is consistent with the 2016 and 2017 salary guarantees above.