Sokol received $750,000 in 2011 as part of supplemental executive retirement plan, or SERP, the filing showed.

"Sokol's post-termination SERP benefit is $1 million annually, paid in monthly installments. He elected a one-time lump sum payment of his MidAmerican Energy Company Retirement Plan benefit of $301,687, which was paid to him on May 1, 2011," MidAmerican said in the filing.

Sokol, who once chaired Berkshire's MidAmerican Energy unit, ran its NetJets plane leasing unit, and was a top Warren Buffett deal maker, was considered a leading contender to succeed Buffett as Berkshire's chief executive.

However, last year Buffett said Sokol had violated Berkshire insider trading rules by failing to disclose his purchase of Lubrizol shares, less than four weeks after starting talks with Citigroup Inc (C.N) bankers about the company.

Buffett told investors on Saturday the Berkshire board has identified his successor as chief executive, but did not disclose who.

Sokol received $231,250 as base salary in 2011 and his total compensation for the year amounted to $10.4 million, including a $10.1 million change in pension value, the latest filing showed.

(Reporting by Sakthi Prasad; Editing by Muralikumar Anantharaman)

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