Abel was named vice chairman of Berkshire Hathaway in 2018. Although he has been at the company for more than two decades, he is considered to be much more guarded and hands-on than Buffett.

Shell Plc is working with advisers to evaluate a potential acquisition of rival BP Plc , though it is waiting for further stock and oil price declines before deciding whether to pursue a bid, Bloomberg News reported on Saturday citing people familiar with the matter.