What exactly is on the Fed balance sheet? All the rage these days is how crazily big the Fed's balance sheet has grown. Looking on federalreserve.gov, I can see its value topped up ~6,573,136 millions USD (~6 trillion USD).

Fine, but is there an exhaustive list of all the assets on this balance sheet? Loans? Bonds? Cash? Equities?
See this federal Reserve webpage that provides links.

Note that these are aggregates; there are specialised reports on various components of their balance sheets.

The FRED website has these series in an interactive database.