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Goodwill and Acquired Intangibles | 12 Months Ended
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Dec. 31, 2022
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, 2020 |  | $ | 187 |  |  | $ | 2,091 |  |  | $ | 6,768 |  |  | $ | 1,760 |  |  | $ | 10,806 |
Acquisitions |  | — |  |  | — |  |  | — |  |  | 17 |  |  | 17 |
Other |  | — |  |  | (1) |  |  | (9) |  |  | — |  |  | (10) |
Balance at December 31, 2021 |  | 187 |  |  | 2,090 |  |  | 6,759 |  |  | 1,777 |  |  | 10,813 |
Acquisitions |  | — |  |  | — |  |  | 3 |  |  | — |  |  | 3 |
Other |  | 9 |  |  | (7) |  |  | (36) |  |  | (2) |  |  | (36) |
Balance at December 31, 2022 |  | $ | 196 |  |  | $ | 2,083 |  |  | $ | 6,726 |  |  | $ | 1,775 |  |  | $ | 10,780 |
The gross carrying amounts and accumulated amortization of our acquired intangible assets consisted of the following (useful life in years, $ in millions):
|  |  | 2022 |  |  | 2021
| Estimated Useful Lives |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Finite-Lived: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer programs | 9 - 20 |  | $ | 3,186 |  |  | $ | (1,664) |  |  |  | $ | 1,522 |  |  |  | $ | 3,184 |  |  | $ | (1,431) |  |  |  | $ | 1,753 |
Customer relationships | 4 - 10 |  | 94 |  |  | (78) |  |  |  | 16 |  |  |  | 120 |  |  | (96) |  |  |  | 24 |
Other | 3 - 10 |  | 72 |  |  | (38) |  |  |  | 34 |  |  |  | 76 |  |  | (34) |  |  |  | 42 |
Total finite-lived intangibles |  |  | 3,352 |  |  | (1,780) |  |  |  | 1,572 |  |  |  | 3,380 |  |  | (1,561) |  |  |  | 1,819 |
Indefinite-Lived: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trademark |  |  | 887 |  |  | — |  |  |  | 887 |  |  |  | 887 |  |  | — |  |  |  | 887 |
Total acquired intangibles |  |  | $ | 4,239 |  |  | $ | (1,780) |  |  |  | $ | 2,459 |  |  |  | $ | 4,267 |  |  | $ | (1,561) |  |  |  | $ | 2,706 |
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 $248 million, $285 million and $271 million in 2022, 2021 and 2020. Estimated future amortization expense is as follows: $248 million in 2023; $244 million in 2024; $220 million in 2025; $154 million in 2026; and $153 million in 2027.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI https://asc.fasb.org/topic&trid=2144416 + Details
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