Property, plant and equipment (Tables)

9 Months Ended

Sep. 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		September  30, 2012			December  31, 2011
Land		—	$	990		$	940
Buildings and improvements		3 – 40 years		5,694			5,429
Machinery and equipment		3 – 25 years		14,119			13,589
Furniture, fixtures and other		2 – 20 years		2,829			2,397
Assets held for lease		12 – 30 years		6,611			5,997
				30,243			28,352
Accumulated depreciation				(11,319	)		(10,175	)
			$	18,924		$	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
			September 30, 2012			December 31, 2011
Railroad:
Land		—	$	5,942		$	5,925
Track structure and other roadway		5 – 100 years		37,790			36,760
Locomotives, freight cars and other equipment		5 – 37 years		6,358			5,533
Construction in progress		—		1,072			885
Utilities and energy:
Utility generation, distribution and transmission system		5 – 80 years		41,813			40,180
Interstate pipeline assets		3 – 80 years		6,323			6,245
Independent power plants and other assets		3 – 30 years		1,129			1,106
Construction in progress		—		2,639			1,559
				103,066			98,193
Accumulated depreciation				(17,143	)		(15,979	)
			$	85,923		$	82,214