Property, plant and equipment (Tables)

6 Months Ended

Jun. 30, 2012

Insurance and Other [Member]

Property, plant and equipment

Property, plant and equipment of our insurance and other businesses are comprised of the following (in millions).

	Ranges of estimated useful life	June 30, 2012			December 31, 2011
Land	—	$	964		$	940
Buildings and improvements	3 – 40 years		5,494			5,429
Machinery and equipment	3 – 25 years		13,811			13,589
Furniture, fixtures and other	2 – 20 years		2,645			2,397
Assets held for lease	12 – 30 years		6,362			5,997
			29,276			28,352
Accumulated depreciation			(10,888	)		(10,175	)
		$	18,388		$	18,177

Railroad, Utilities and Energy [Member]

Property, plant and equipment

Property, plant and equipment of our railroad, utilities and energy businesses are comprised of the following (in millions).

	Ranges of estimated  useful life	June 30, 2012			December 31, 2011
Railroad:
Land	—	$	5,926		$	5,925
Track structure and other roadway	5 – 100 years		37,453			36,760
Locomotives, freight cars and other equipment	5 – 37 years		6,038			5,533
Construction in progress	—		965			885
Utilities and energy:
Utility generation, distribution and transmission system	5 – 80 years		41,083			40,180
Interstate pipeline assets	3 – 80 years		6,278			6,245
Independent power plants and other assets	3 – 30 years		1,115			1,106
Construction in progress	—		2,265			1,559
			101,123			98,193
Accumulated depreciation			(16,680	)		(15,979	)
		$	84,443		$	82,214