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Related Party Transactions
6 Months Ended
Jun. 30, 2011
Related Party Transactions [Abstract]  
Related Party Transactions
9.   Related Party Transactions
          The companies identified as affiliates of BNSF include Berkshire and its subsidiaries. During the six months ended June 30, 2011, the Company declared and paid cash distributions of $2 billion to its parent company. For the six months ended June 30, 2011, the Company received a tax refund of $316 million from Berkshire and made tax payments of $68 million.