Berkshire shareholders are 'stunned' as Warren Buffett announces plan to step down after 6 decades

1. Warren Buffett announced intention to step down by year-end, surprising investors. 2. Greg Abel, head of Berkshire's energy unit, named as potential successor. 3. Buffett's departure may mark end of an era for Berkshire's leadership. 4. Shareholders express affection for Buffett amid concerns about company succession. 5. Buffett remains committed to Berkshire and plans to stay involved.