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Goodwill and Acquired Intangibles | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Acquired Intangibles | Goodwill and Acquired Intangibles Changes in the carrying amount of goodwill by segment were as follows (in millions):
|  | Aeronautics |  |  | MFC |  |  | RMS |  |  | Space |  |  | Total |
Balance at December 31, 2016 |  | $ | 171 |  |  | $ | 2,260 |  |  | $ | 6,748 |  |  | $ | 1,585 |  |  | $ | 10,764 |
Other |  | — |  |  | 5 |  |  | 36 |  |  | 2 |  |  | 43 |
Balance at December 31, 2017 |  | 171 |  |  | 2,265 |  |  | 6,784 |  |  | 1,587 |  |  | 10,807 |
Other |  | — |  |  | (3 | ) |  | (33 | ) |  | (2 | ) |  | (38 | )
Balance at December 31, 2018 |  | $ | 171 |  |  | $ | 2,262 |  |  | $ | 6,751 |  |  | $ | 1,585 |  |  | $ | 10,769 |
The gross carrying amounts and accumulated amortization of our acquired intangible assets consisted of the following (in millions):
|  | 2018 |  |  | 2017
|  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Finite-Lived: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer programs |  | $ | 3,184 |  |  | $ | (735 | ) |  |  | $ | 2,449 |  |  |  | $ | 3,184 |  |  | $ | (503 | ) |  |  | $ | 2,681 |
Customer relationships |  | 344 |  |  | (199 | ) |  |  | 145 |  |  |  | 352 |  |  | (140 | ) |  |  | 212 |
Other |  | 53 |  |  | (40 | ) |  |  | 13 |  |  |  | 71 |  |  | (54 | ) |  |  | 17 |
Total finite-lived intangibles |  | 3,581 |  |  | (974 | ) |  |  | 2,607 |  |  |  | 3,607 |  |  | (697 | ) |  |  | 2,910 |
Indefinite-Lived: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trademark |  | 887 |  |  | — |  |  |  | 887 |  |  |  | 887 |  |  | — |  |  |  | 887 |
Total acquired intangibles |  | $ | 4,468 |  |  | $ | (974 | ) |  |  | $ | 3,494 |  |  |  | $ | 4,494 |  |  | $ | (697 | ) |  |  | $ | 3,797 |
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, from three to 10 years. Amortization expense for acquired finite-lived intangible assets was $296 million, $312 million and $284 million in 2018, 2017 and 2016. Estimated future amortization expense is as follows: $285 million in 2019; $263 million in 2020; $256 million in 2021; $253 million in 2022; $250 million in 2023 and $1.3 billion thereafter. With the acquisition of Sikorsky Aircraft Corporation (Sikorsky), we recorded customer contractual obligations of $507 million. Customer contractual obligations represent liabilities on certain development programs where the expected costs exceed the expected sales under contract. These liabilities are liquidated in accordance with the underlying economic pattern of the contractual obligations, as reflected by the estimated future net cash outflows incurred on the associated contracts. As of December 31, 2018, we have recognized approximately $325 million in net sales related to customer contractual obligations. As of December 31, 2018, the estimated liquidation of the customer contractual obligation is approximated as follows: $70 million in 2019, $45 million in 2020, $15 million in 2021, $30 million in 2022, $5 million in 2023 and $17 million thereafter.

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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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