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PROPERTY AND EQUIPMENT, NET
 12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
PROPERTY AND EQUIPMENT, NET PROPERTY AND EQUIPMENT, NET
Property and equipment, net consisted of:
December 31,
20192018
Office and computer equipment (3 - 10 year estimated useful life)
$221  $242  
Office furniture and fixtures (3 - 10 year estimated useful life)
51  52  
Internal-use computer software (1 - 10 year estimated useful life)
619  574  
Leasehold improvements and building (1 - 21 year estimated useful life)
240  242  
Total property and equipment, at cost1,131  1,110  
Less: accumulated depreciation and amortization(839) (790) 
Total property and equipment, net$292  $320  
Depreciation and amortization expense related to the above assets was $97 million, $90 million, and $97 million for the years ended December 31, 2019, 2018 and 2017, respectively.