Ok I see you took book keeping 101. This is a lot more advance than that. For staters the balance sheet should only have 800M in bonds on them. The report is limited by the accounting period. If this was a pro forma balance sheet you would be correct.
Second you have to read the bond agreement to see how the bonds should be booked. From the last PR on the bonds the booking is correct. They don't own the bonds. They own the rights to the intrest. Why would a company give this away is up to the bond holders. In my opinion it is a way to reduce the risk and increase returns. Most of the bonds have a junk or just above junk rating.