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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2023
Accounting Policies [Abstract]  
Summary of Major Classes of Property and Equipment
Property and equipment are stated at cost and are depreciated using the straight-line method over the shorter of the asset’s estimated useful life or the lease term, if related to leased property, as follows:

Buildings and leasehold improvements3-40 years
Equipment3-10 years
Furniture and fixtures5-10 years
Transportation equipment3-20 years
The major classes of property and equipment were as follows:
December 31,
(in millions)20232022
Land, buildings and leasehold improvements$376 $363 
Equipment803 852 
Transportation equipment81 83 
Furniture and fixtures66 74 
Property and equipment, gross1,326 1,372 
Less accumulated depreciation(803)(840)
Property and equipment, net$523 $532 
Definite-Lived Identifiable Intangible Assets Amortized
Definite-lived other identifiable intangible assets are amortized primarily using an accelerated method that reflects the pattern in which the Company expects to benefit from the use of the asset over its estimated remaining useful life as follows:

Client relationships and backlog1-25 years
Software and related assets1-10 years
Trademarks, trade names and other1-17 years
Databases1-9 years
Non-compete agreements2-5 years
The following is a summary of other identifiable intangible assets:
December 31, 2023December 31, 2022
(in millions)Gross AmountAccumulated AmortizationNet AmountGross AmountAccumulated AmortizationNet Amount
Definite-lived identifiable intangible assets:
Client relationships and backlog$5,688 $(2,724)$2,964 $5,339 $(2,332)$3,007 
Software and related assets3,629 (2,005)1,624 3,106 (1,591)1,515 
Trademarks, trade names and other548 (320)228 545 (278)267 
Databases1,837 (1,819)18 1,817 (1,794)23 
Non-compete agreements16 (11)5 23 (15)
$11,718 $(6,879)$4,839 $10,830 $(6,010)$4,820