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Intangible Assets
 6 Months Ended
Jun. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
The following tables summarize intangible assets:
June 30, 2024
(in millions)Gross Carrying AmountAccumulated AmortizationNet Carrying Amount
Customer relationships$260 $(207)$53 
Intellectual property and patents15 (10)5 
Trademarks23 (18)5 
Total$298 $(235)$63 
December 31, 2023
(in millions)Gross Carrying AmountAccumulated AmortizationNet Carrying Amount
Customer relationships$261 $(204)$57 
Intellectual property and patents18 (11)7 
Trademarks25 (17)8 
Total$304 $(232)$72 
Intangible asset amortization expense for the three and six months ended June 30, 2024, reported within the Condensed Consolidated Statements of Operations, was $3 million and $6 million, respectively. Intangible asset amortization expense for the three and six months ended June 30, 2023, reported within the Condensed Consolidated Statements of Operations, was $4 million and $8 million, respectively.