Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Property and Equipment, at Cost

Property and equipment, at cost, consisted of the following (in millions):

	December 31,
	2017		2018
Gross property and equipment (1):
Land and buildings	$	23,896	$	31,741
Equipment	42,244		54,591
Other assets	2,438		2,577
Construction in progress	4,078		6,861
Gross property and equipment	72,656		95,770
Total accumulated depreciation and amortization (1)	23,790		33,973
Total property and equipment, net	$	48,866	$	61,797

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(1) We revised our prior year presentation of gross property and equipment and total accumulated depreciation and amortization to include all property and equipment in service, including equipment which is fully-depreciated, to conform to the current year presentation. Total property and equipment, net remains unchanged for the prior year.