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Merger Total Purchase Price to be Recorded (Details) (Berkshire Hathaway, Inc. [Member], USD $)
In Millions, unless otherwise specified
Feb. 12, 2010
Berkshire Hathaway, Inc. [Member]
 
Business Acquisition [Line Items]  
Cash paid as merger consideration $ 15,874
Value of Berkshire common stock issued as merger consideration 10,577
Total merger consideration to acquire the remaining shares of Predecessor 26,451
Value of Predecessor already owned by Berkshire valued at merger price of $100.00 per share 7,678
Value of Berkshire equity awards to replace pre-existing Predecessor equity awards 366
Total purchase price recorded $ 34,495