Chevron Corp. has prevailed in a 20-month fight to buy Hess Corp. for $53 billion, overcoming a challenge by arch rival Exxon Mobil Corp. that was unprecedented in the modern history of Big Oil.

Key Takeaways Chevron completed its $53 billion purchase of Hess after winning an arbitration case brought by rival Exxon Mobil and the China National Offshore Oil Corporation.The International Chamber of Commerce dismissed the challenge related to Chevron acquiring Hess's production sites in Guyana.

Chevron Corp. won its arbitration battle with Exxon Mobil Corp. and has closed its $53-billion deal to buy Hess Corp. more than 20 months after the takeover was announced.