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Property, plant and equipment (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2012
Insurance and Other [Member]
Dec. 31, 2011
Insurance and Other [Member]
Sep. 30, 2012
Insurance and Other [Member]
Land [Member]
Dec. 31, 2011
Insurance and Other [Member]
Land [Member]
Sep. 30, 2012
Insurance and Other [Member]
Building and building improvements [Member]
Dec. 31, 2011
Insurance and Other [Member]
Building and building improvements [Member]
Sep. 30, 2012
Insurance and Other [Member]
Building and building improvements [Member]
Minimum [Member]
Sep. 30, 2012
Insurance and Other [Member]
Building and building improvements [Member]
Maximum [Member]
Sep. 30, 2012
Insurance and Other [Member]
Machinery and equipment [Member]
Dec. 31, 2011
Insurance and Other [Member]
Machinery and equipment [Member]
Sep. 30, 2012
Insurance and Other [Member]
Machinery and equipment [Member]
Minimum [Member]
Sep. 30, 2012
Insurance and Other [Member]
Machinery and equipment [Member]
Maximum [Member]
Sep. 30, 2012
Insurance and Other [Member]
Furniture, fixtures and other [Member]
Dec. 31, 2011
Insurance and Other [Member]
Furniture, fixtures and other [Member]
Sep. 30, 2012
Insurance and Other [Member]
Furniture, fixtures and other [Member]
Minimum [Member]
Sep. 30, 2012
Insurance and Other [Member]
Furniture, fixtures and other [Member]
Maximum [Member]
Sep. 30, 2012
Insurance and Other [Member]
Assets held for lease [Member]
Dec. 31, 2011
Insurance and Other [Member]
Assets held for lease [Member]
Sep. 30, 2012
Insurance and Other [Member]
Assets held for lease [Member]
Minimum [Member]
Sep. 30, 2012
Insurance and Other [Member]
Assets held for lease [Member]
Maximum [Member]
Sep. 30, 2012
Railroad [Member]
Land [Member]
Dec. 31, 2011
Railroad [Member]
Land [Member]
Sep. 30, 2012
Railroad [Member]
Track structure and other roadway [Member]
Dec. 31, 2011
Railroad [Member]
Track structure and other roadway [Member]
Sep. 30, 2012
Railroad [Member]
Track structure and other roadway [Member]
Minimum [Member]
Sep. 30, 2012
Railroad [Member]
Track structure and other roadway [Member]
Maximum [Member]
Sep. 30, 2012
Railroad [Member]
Locomotives, freight cars and other equipment [Member]
Dec. 31, 2011
Railroad [Member]
Locomotives, freight cars and other equipment [Member]
Sep. 30, 2012
Railroad [Member]
Locomotives, freight cars and other equipment [Member]
Minimum [Member]
Sep. 30, 2012
Railroad [Member]
Locomotives, freight cars and other equipment [Member]
Maximum [Member]
Sep. 30, 2012
Railroad [Member]
Construction in progress [Member]
Dec. 31, 2011
Railroad [Member]
Construction in progress [Member]
Sep. 30, 2012
Utilities and Energy [Member]
Utility generation, distribution and transmission system [Member]
Dec. 31, 2011
Utilities and Energy [Member]
Utility generation, distribution and transmission system [Member]
Sep. 30, 2012
Utilities and Energy [Member]
Utility generation, distribution and transmission system [Member]
Minimum [Member]
Sep. 30, 2012
Utilities and Energy [Member]
Utility generation, distribution and transmission system [Member]
Maximum [Member]
Sep. 30, 2012
Utilities and Energy [Member]
Interstate pipeline assets [Member]
Dec. 31, 2011
Utilities and Energy [Member]
Interstate pipeline assets [Member]
Sep. 30, 2012
Utilities and Energy [Member]
Interstate pipeline assets [Member]
Minimum [Member]
Sep. 30, 2012
Utilities and Energy [Member]
Interstate pipeline assets [Member]
Maximum [Member]
Sep. 30, 2012
Utilities and Energy [Member]
Independent power plants and other assets [Member]
Dec. 31, 2011
Utilities and Energy [Member]
Independent power plants and other assets [Member]
Sep. 30, 2012
Utilities and Energy [Member]
Independent power plants and other assets [Member]
Minimum [Member]
Sep. 30, 2012
Utilities and Energy [Member]
Independent power plants and other assets [Member]
Maximum [Member]
Sep. 30, 2012
Utilities and Energy [Member]
Construction in progress [Member]
Dec. 31, 2011
Utilities and Energy [Member]
Construction in progress [Member]
Sep. 30, 2012
Railroad, Utilities and Energy [Member]
Dec. 31, 2011
Railroad, Utilities and Energy [Member]
Property, Plant and Equipment [Line Items]                                                                                                
Property, plant and equipment, gross $ 30,243 $ 28,352 $ 990 $ 940 $ 5,694 $ 5,429     $ 14,119 $ 13,589     $ 2,829 $ 2,397     $ 6,611 $ 5,997     $ 5,942 $ 5,925 $ 37,790 $ 36,760     $ 6,358 $ 5,533     $ 1,072 $ 885 $ 41,813 $ 40,180     $ 6,323 $ 6,245     $ 1,129 $ 1,106     $ 2,639 $ 1,559 $ 103,066 $ 98,193
Accumulated depreciation (11,319) (10,175)                                                                                         (17,143) (15,979)
Total Property, plant and equipment, net $ 18,924 $ 18,177                                                                                         $ 85,923 $ 82,214
Estimated useful life (in years)             3 years 40 years     3 years 25 years     2 years 20 years     12 years 30 years         5 years 100 years     5 years 37 years         5 years 80 years     3 years 80 years     3 years 30 years