Earlier quoted context omitted.
Is the CDS market big enough to do that? It's big, but the oil market is massive.
Hard for me to say, a lot stuff is traded over the counter, and one can get short exposure alot of different ways. Blackrock[0] has about $10 trillion notional for the single name cds market in 2016, estimated in 2017 that there was about ~$15,000 million avg daily volume in HY, and ~$26,000 million in IG (cash traded bonds, etfs, and cdx) and that's not considering the notional on the derivatives (swaps/options) on…
If the total single-name CDS market is $10t and $1t of that is in oil and gas firms...it doesn't seem out of the question you could get a $30b position. Not that I really believe this is what's going on.