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Intangible Assets
 12 Months Ended
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
The following table summarizes intangible assets as of December 31:
20242023
(in millions)LifeGross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
Customer relationships
5 - 20 years
$261 $(211)$50 $261 $(204)$57 
Intellectual property and patents
3 - 15 years
15 (11)4 18 (11)7 
Trademarks
5 - 13 years
21 (17)4 25 (17)8 
Total$297 $(239)$58 $304 $(232)$72 
Intangible Asset Amortization Expense
Intangible asset amortization expense, reported within selling, general and administrative expenses within the Consolidated Statements of Operations, was $13 million, $15 million and $16 million for the years ended December 31, 2024, 2023 and 2022, respectively.
As of December 31, 2024, estimated future amortization expense for intangible assets is as follows:
(in millions)
2025$11 
202610 
20278 
20288 
20297