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Goodwill and Acquired Intangibles | 12 Months Ended
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Dec. 31, 2021
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, 2019 |  | $ | 171 |  |  | $ | 2,089 |  |  | $ | 6,758 |  |  | $ | 1,586 |  |  | $ | 10,604 |
Acquisitions |  | 16 |  |  | — |  |  | — |  |  | 173 |  |  | 189 |
Other |  | — |  |  | 2 |  |  | 10 |  |  | 1 |  |  | 13 |
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 |
The gross carrying amounts and accumulated amortization of our acquired intangible assets consisted of the following (in millions):
|  | 2021 |  |  | 2020
|  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Finite-Lived: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer programs |  | $ | 3,184 |  |  | $ | (1,431) |  |  |  | $ | 1,753 |  |  |  | $ | 3,184 |  |  | $ | (1,199) |  |  |  | $ | 1,985 |
Customer relationships |  | 120 |  |  | (96) |  |  |  | 24 |  |  |  | 366 |  |  | (287) |  |  |  | 79 |
Other |  | 76 |  |  | (34) |  |  |  | 42 |  |  |  | 85 |  |  | (24) |  |  |  | 61 |
Total finite-lived intangibles |  | 3,380 |  |  | (1,561) |  |  |  | 1,819 |  |  |  | 3,635 |  |  | (1,510) |  |  |  | 2,125 |
Indefinite-Lived: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trademark |  | 887 |  |  | — |  |  |  | 887 |  |  |  | 887 |  |  | — |  |  |  | 887 |
Total acquired intangibles |  | $ | 4,267 |  |  | $ | (1,561) |  |  |  | $ | 2,706 |  |  |  | $ | 4,522 |  |  | $ | (1,510) |  |  |  | $ | 3,012 |
Acquired finite-lived intangible assets are amortized to expense primarily on a straight-line basis over the following estimated useful lives: customer programs from nine to 20 years; customer relationships from four to 10 years; and other intangibles assets from three to 10 years. Amortization expense for acquired finite-lived intangible assets was $285 million, $271 million and $284 million in 2021, 2020 and 2019. Estimated future amortization expense is as follows: $248 million in 2022; $246 million in 2023; $243 million in 2024; $221 million in 2025; and $154 million in 2026.

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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 http://asc.fasb.org/topic&trid=2144416 + Details
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