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Property and Equipment
 9 Months Ended
Sep. 30, 2024
Property, Plant and Equipment [Abstract]  
Property and Equipment Property and Equipment
The following table summarizes our property and equipment:
(In millions)September 30, 2024December 31, 2023
Property and equipment
Buildings and leasehold improvements$45 $33 
Vehicles, tractors and trailers24 24 
Machinery and equipment44 41 
Computer software and equipment362 319 
Total property and equipment, gross475 417 
Less: accumulated depreciation(300)(293)
Total property and equipment, net$175 $124 
Net book value of capitalized internally-developed software included in property and equipment, net$103 $63 
Depreciation of property and equipment and amortization of computer software was $16 million and $43 million for the three and nine months ended September 30, 2024. Depreciation of property and equipment and amortization of computer software was $12 million and $42 million for the three and nine months ended September 30, 2023.