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Goodwill and intangible assets
 6 Months Ended
Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and intangible assets Goodwill and intangible assets
The changes in the carrying amount of goodwill for the six months ended December 31, 2022 are as follows:
Diversified Industrial
Segment		Aerospace
Systems
Segment		Total
Balance at June 30, 2022$7,185,981 $554,101 $7,740,082 
Acquisition56,587 2,834,632 2,891,219 
Divestiture(1,064)— (1,064)
Foreign currency translation173 38,494 38,667 
Balance at December 31, 2022$7,241,677 $3,427,227 $10,668,904 
Acquisition represents goodwill resulting from the preliminary purchase price allocation for the Acquisition during the measurement period. Refer to Note 4 for further discussion. Divestiture represents goodwill associated with a sale of a business during the current-year quarter.
Intangible assets are amortized using the straight-line method over their legal or estimated useful lives. The following summarizes the gross carrying value and accumulated amortization for each major category of intangible assets:
 December 31, 2022June 30, 2022
 Gross Carrying
Amount		Accumulated
Amortization		Gross Carrying
Amount		Accumulated
Amortization
Patents and technology$2,739,656 $312,435 $990,775 $259,587 
Trademarks1,225,622 364,368 727,820 339,244 
Customer lists and other6,975,403 1,875,961 3,735,042 1,718,989 
Total$10,940,681 $2,552,764 $5,453,637 $2,317,820 
Total intangible amortization expense for the six months ended December 31, 2022 and 2021 was $229 million and $159 million, respectively. The estimated amortization expense for the five years ending June 30, 2023 through 2027 is $520 million, $559 million, $551 million, $546 million and $540 million, respectively.
Intangible assets are evaluated for impairment whenever events or circumstances indicate that the undiscounted net cash flows to be generated by their use over their expected useful lives and eventual disposition may be less than their net carrying value. No material intangible asset impairments occurred during the six months ended December 31, 2022 and 2021.