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Property and Equipment
 12 Months Ended
Dec. 31, 2024
Property, Plant and Equipment [Abstract]  
Property and Equipment Property and Equipment
Property and equipment consisted of the following (in millions):
As of December 31,Depreciation
Period
(Years)
20242023
Software and internally developed software$2,061 $1,834 
3 to 7
Computer and network equipment1,073 1,033 
3 to 5
Land180 180 N/A
Buildings and building improvements436 389 
15 to 30
Right-of-use lease assets
295 305 
1 to 30
Leasehold improvements455 372 
4 to 15
Equipment, aircraft and office furniture192 156 
4 to 12
Total property and equipment4,692 4,269 
Less accumulated depreciation and amortization(2,539)(2,346)
Property and equipment, net$2,153 $1,923 
In 2024, 2023 and 2022, amortization of software and internally developed software was $324 million, $284 million and $247 million, respectively, and depreciation of all other property and equipment was $201 million, $182 million and $174 million, respectively. As of December 31, 2024 and 2023, unamortized software and internally developed software was $598 million and $535 million, respectively.