pre_text: 6. Property and Equipment, Net Property and equipment, net was comprised of the following (amounts in millions): Depreciation expense for the years ended December 31, 2019, 2018, and 2017 was $124 million, $138 million, and $130 million, respectively.
table: At December 31,
table: 2019 2018
table: Land $1 $1
table: Buildings 4 4
table: Leasehold improvements 252 248
table: Computer equipment 654 700
table: Office furniture and other equipment 91 99
table: Total cost of property and equipment 1,002 1,052
table: Less accumulated depreciation (749) (770)
table: Property and equipment, net $253 $282
question: Analyse this data from a financial earnings document. What was the change in the net cost of computer equipment between 2018 and 2019?