The assets of WMIIC at the moment of the transfer to the WMILT were in the "millions" range, if I remember correctly. Yes I read the first WMI bankruptcy filing, showing $32B in assets and $8B in liabilites for WMI, which later was amended and said these 32B mainly contain the stock in WMB.
That does not mean they have $796 billion in asssets. That is the "unpaid principal balance" of the loans. And I showed in a previous post that Nationstar already had $500 billion (sorry, cannot remember the exact number, but the range is correct, I have to look it up)