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OTHER INTANGIBLE ASSETS
 3 Months Ended
Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
OTHER INTANGIBLE ASSETS OTHER INTANGIBLE ASSETS
Intangible assets consist of the following:
March 31, 2024December 31, 2023
Gross
Carrying
Amount		Accumulated
Amortization		NetGross
Carrying
Amount		Accumulated
Amortization		Net
Customer relationships$1,940 $(836)$1,104 $1,945 $(818)$1,127 
Technology1,258 (921)337 1,253 (899)354 
Trade names and trademarks291 (189)102 290 (186)104 
Capitalized software1,437 (1,127)310 1,413 (1,107)306 
Finite-lived intangible assets4,926 (3,073)1,853 4,901 (3,010)1,891 
Indefinite-lived intangible assets2,202 — 2,202 2,202 — 2,202 
Total intangible assets$7,128 $(3,073)$4,055 $7,103 $(3,010)$4,093 
Amortization expense for the three months ended March 31, 2024 and 2023 was $68 million and $63 million, respectively.
Estimated amortization expense for the remainder of 2024 and each of the subsequent five fiscal years is expected to be as follows:
YearEstimated Amortization Expense
Remainder of 2024
$190 
2025215 
2026170 
2027147 
2028126 
2029105