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Goodwill and Acquired Intangibles | 12 Months Ended
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Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Acquired Intangibles | Goodwill and Acquired Intangibles Changes in the carrying amount of goodwill by business segment were as follows (in millions):
|  | Aeronautics |  | MFC |  | RMS |  | Space |  | Total
Balance at December 31, 2022 |  | $ | 196 |  |  | $ | 2,083 |  |  | $ | 6,726 |  |  | $ | 1,775 |  |  | $ | 10,780 |
Other |  | — |  |  | 3 |  |  | 15 |  |  | 1 |  |  | 19 |
Balance at December 31, 2023 |  | 196 |  |  | 2,086 |  |  | 6,741 |  |  | 1,776 |  |  | 10,799 |
Acquisitions |  | — |  |  | — |  |  | — |  |  | 298 |  |  | 298 |
Other |  | — |  |  | (1) |  |  | (29) |  |  | — |  |  | (30) |
Balance at December 31, 2024 |  | $ | 196 |  |  | $ | 2,085 |  |  | $ | 6,712 |  |  | $ | 2,074 |  |  | $ | 11,067 |
The gross carrying amounts and accumulated amortization of our acquired intangible assets consisted of the following (useful life in years, $ in millions):
|  |  | 2024 |  |  | 2023
| Estimated Useful Lives |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Finite-Lived: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer programs | 3 - 20 |  | $ | 3,186 |  |  | $ | (2,128) |  |  |  | $ | 1,058 |  |  |  | $ | 3,186 |  |  | $ | (1,897) |  |  |  | $ | 1,289 |
Customer relationships | 5 - 10 |  | 94 |  |  | (91) |  |  |  | 3 |  |  |  | 94 |  |  | (84) |  |  |  | 10 |
Other | 5 - 10 |  | 156 |  |  | (39) |  |  |  | 117 |  |  |  | 72 |  |  | (46) |  |  |  | 26 |
Total finite-lived intangibles |  |  | 3,436 |  |  | (2,258) |  |  |  | 1,178 |  |  |  | 3,352 |  |  | (2,027) |  |  |  | 1,325 |
Indefinite-Lived: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trademark |  |  | 837 |  |  | — |  |  |  | 837 |  |  |  | 887 |  |  | — |  |  |  | 887 |
Total acquired intangibles |  |  | $ | 4,273 |  |  | $ | (2,258) |  |  |  | $ | 2,015 |  |  |  | $ | 4,239 |  |  | $ | (2,027) |  |  |  | $ | 2,212 |
Acquired finite-lived intangible assets are amortized to expense primarily on a straight-line basis over their estimated useful lives. Amortization expense for acquired finite-lived intangible assets was $247 million for both 2024 and 2023 and $248 million in 2022. Estimated future amortization expense is as follows: $241 million in 2025; $174 million in 2026; $173 million in 2027; $168 million in 2028; and $159 million in 2029.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details
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