Property, plant and equipment (Tables)

9 Months Ended

Sep. 30, 2011

Insurance and Other [Member]

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

	Ranges of estimated useful life	September 30, 2011			December 31, 2010
Land	—	$	872		$	744
Buildings and improvements	3 – 40 years		5,263			4,661
Machinery and equipment	3 – 25 years		13,110			11,573
Furniture, fixtures and other	3 – 20 years		2,412			1,932
Assets held for lease	12 –30 years		5,886			5,832
			27,543			24,742
Accumulated depreciation			(9,739	)		(9,001	)
		$	17,804		$	15,741

Railroad, Utilities and Energy [Member]

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

	Ranges of estimated useful life	September 30, 2011			December 31, 2010
Railroad:
Land	—	$	5,925		$	5,901
Track structure and other roadway	5 – 100 years		36,301			35,463
Locomotives, freight cars and other equipment	5 – 37 years		5,134			4,329
Construction in progress	—		856			453
Utilities and energy:
Utility generation, distribution and transmission system	5 – 85 years		38,907			37,643
Interstate pipeline assets	3 – 67 years		5,962			5,906
Independent power plants and other assets	3 – 30 years		1,102			1,097
Construction in progress	—		2,145			1,456
			96,332			92,248
Accumulated depreciation			(15,690	)		(14,863	)
		$	80,642		$	77,385