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Intangible Assets
 12 Months Ended
Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
December 31, 2022December 31, 2021
(In millions)Gross Carrying AmountAccumulated AmortizationGross Carrying AmountAccumulated Amortization
Definite-lived intangibles
Customer relationships$799 $392 $817 $347 
We did not recognize any impairment of our identified intangible assets in 2022, 2021 and 2020.
Estimated future amortization expense for amortizable intangible assets for the next five years is as follows:
(In millions)20232024202520262027Thereafter
Estimated amortization expense$54 $54 $54 $53 $53 $139 
Actual amounts of amortization expense may differ from estimated amounts due to changes in foreign currency exchange rates, additional intangible asset acquisitions, future impairment of intangible assets, accelerated amortization of intangible assets and other events.
Intangible asset amortization expense was $54 million, $56 million and $55 million for the years ended December 31, 2022, 2021 and 2020, respectively.