Property, plant and equipment and assets held for lease (Tables)

12 Months Ended

Dec. 31, 2016

Schedule of depreciation expense

Depreciation expense for each of the three years ending December 31, 2016 is summarized below (in millions).

	2016		2015		2014
Insurance and other	$	2,148	$	1,680	$	1,632
Railroad, utilities and energy		4,639		4,383		3,981
Finance and financial products		624		610		602
	$	7,411	$	6,673	$	6,215

Insurance and Other [Member]

Schedule of property, plant and equipment

A summary of property, plant and equipment of our insurance and other businesses follows (in millions).

	Ranges of estimated useful life		December 31,
			2016			2015
Land		—	$	2,108		$	1,689
Buildings and improvements		5 – 40 years		8,360			7,329
Machinery and equipment		3 – 25 years		20,463			17,054
Furniture, fixtures and other		2 – 15 years		4,080			3,545
				35,011			29,617
Accumulated depreciation				(15,686	)		(14,077	)
			$	19,325		$	15,540

Finance and Financial Products [Member]

Schedule of property, plant and equipment

Assets held for lease and property, plant and equipment of our finance and financial products businesses are summarized below (in millions).

	Ranges of estimated useful life		December 31,
			2016			2015
Assets held for lease		5 – 35 years	$	11,902		$	11,317
Land		—		224			220
Buildings, machinery and other		3 – 50 years		1,302			1,207
				13,428			12,744
Accumulated depreciation				(3,739	)		(3,397	)
			$	9,689		$	9,347

Railroad, Utilities and Energy [Member]

Schedule of property, plant and equipment

A summary of property, plant and equipment of our railroad and our utilities and energy businesses follows (in millions).

	Ranges of estimated useful life		December 31,
			2016			2015
Railroad:
Land		—	$	6,063		$	6,037
Track structure and other roadway		7 – 100 years		48,277			45,967
Locomotives, freight cars and other equipment		6 – 40 years		12,075			11,320
Construction in progress		—		965			1,031
				67,380			64,355
Accumulated depreciation				(6,130	)		(4,845	)
				61,250			59,510
Utilities and energy:
Utility generation, transmission and distribution systems		5 – 80 years		71,536			69,248
Interstate natural gas pipeline assets		3 – 80 years		6,942			6,755
Independent power plants and other assets		3 – 30 years		6,596			5,626
Construction in progress		—		2,098			2,627
				87,172			84,256
Accumulated depreciation				(24,663	)		(23,487	)
				62,509			60,769
			$	123,759		$	120,279