Elon Musk is selling $5 billion in debt for his artificial intelligence startup, xAI Corp., the latest in a series of fundraising efforts across his business empire as the billionaire pivots away from politics and returns to running his various companies.Morgan Stanley is shopping the debt for xAI with a double-digit interest rate, according to people familiar with early pricing discussions. The financing could help Musk continue to spend aggressively on AI infrastructure as he builds out a mass...