Property, plant and equipment (Tables)

6 Months Ended

Jun. 30, 2013

Insurance and Other [Member]

Schedule of property, plant and equipment

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

	Ranges of  estimated useful life		June 30, 2013			December 31, 2012
Land		—	$	1,055		$	1,048
Buildings and improvements		2 – 40 years		6,052			6,074
Machinery and equipment		3 – 20 years		15,677			15,436
Furniture, fixtures and other		2 – 20 years		2,945			2,736
Assets held for lease		12 –30 years		6,956			6,731
				32,685			32,025
Accumulated depreciation				(13,535	)		(12,837	)
			$	19,150		$	19,188

Railroad, Utilities and Energy [Member]

Schedule of property, plant and equipment

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

	Ranges of  estimated useful life		June 30, 2013			December 31, 2012
Railroad:
Land		—	$	5,970		$	5,950
Track structure and other roadway		5 – 100 years		38,798			38,255
Locomotives, freight cars and other equipment		5 – 37 years		6,804			6,528
Construction in progress		—		1,160			963
Utilities and energy:
Utility generation, distribution and transmission system		5 – 80 years		43,162			42,682
Interstate pipeline assets		3 – 80 years		6,357			6,354
Independent power plants and other assets		3 – 30 years		2,311			1,860
Construction in progress		—		2,819			2,647
				107,381			105,239
Accumulated depreciation				(18,182	)		(17,555	)
			$	89,199		$	87,684