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Significant Business Acquisitions - Lubrizol (Detail) (The Lubrizol Corporation [Member], USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Sep. 16, 2011
The Lubrizol Corporation [Member]
     
Assets:      
Cash and cash equivalents     $ 893
Inventories     1,598
Property, plant and equipment     2,344
Intangible assets     3,897
Goodwill     3,877
Other     1,077
Total assets     13,686
Liabilities, noncontrolling interests and net assets acquired:      
Accounts payable, accruals and other liabilities     1,684
Notes payable and other borrowings     1,607
Income taxes, principally deferred     1,563
Noncontrolling interests     128
Total liabilities and noncontrolling interests     4,982
Net assets acquired     8,704
Total liabilities, noncontrolling interests and net assets acquired     13,686
Pro forma total revenues 148,160 141,595  
Pro forma net earnings attributable to Berkshire Hathaway shareholders $ 10,710 $ 13,156  
Pro forma earnings per equivalent Class A common share attributable to Berkshire Hathaway shareholders $ 6,491 $ 8,043