SAN FRANCISCO -- Berkshire Hathaway said late Friday that it plans to borrow roughly $8 billion to help the company pay for its acquisition of railroad operator Burlington Northern Santa Fe . Berkshire agreed earlier this week to pay $26 billion for the rest of Burlington it doesn't already own. The company is paying 60% of that with cash and the rest with Berkshire stock. In a regulatory filing late Friday, Berkshire said it "expects to fund about 50% of the total cash consideration of approximately $16 billion with internally generated cash and the remainder with borrowings expected to be repaid over a three year period."

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