"Lenders that also include Bank of America, Barclays and Mitsubishi UFJ Financial Group committed to provide $13 billion of debt financing for the deal. Their losses would amount to $500 million or more if the debt were to be sold now, according to Bloomberg calculations."
There is Elon's private wealth, mostly in tesla stock from what I understand. The cash and assets from the companies at which he is (majority) owner, CEO or a combination thereof are not his, they belong to his companies, which are separate legal entities.
"Lenders that also include Bank of America, Barclays and Mitsubishi UFJ Financial Group committed to provide $13 billion of debt financing for the deal. Their losses would amount to $500 million or more if the debt were to be sold now, according to Bloomberg calculations."