| Rollforward of Goodwill by Segment |
A rollforward of goodwill by segment was as follows: | | | | | | | | | | | | | | | | | | | | | | | | | (In millions) | Integrated Defense Systems |
| | Intelligence, Information and Services |
| | Missile Systems |
| | Space and Airborne Systems |
| | Forcepoint(1) |
| | Total |
| Balance at December 31, 2016 | $ | 1,702 |
| | $ | 2,966 |
| | $ | 4,154 |
| | $ | 4,106 |
| | $ | 1,860 |
| | $ | 14,788 |
| Acquisitions and divestitures | — |
| | — |
| | — |
| | — |
| | 77 |
| | 77 |
| Effect of foreign exchange rates and other | 4 |
| | 1 |
| | — |
| | — |
| | 1 |
| | 6 |
| Balance at December 31, 2017 | 1,706 |
| | 2,967 |
| | 4,154 |
| | 4,106 |
| | 1,938 |
| | 14,871 |
| Acquisitions and divestitures | — |
| | — |
| | — |
| | (3 | ) | | — |
| | (3 | ) | Effect of foreign exchange rates and other | (2 | ) | | (2 | ) | | — |
| | — |
| | — |
| | (4 | ) | Balance at December 31, 2018 | $ | 1,704 |
| | $ | 2,965 |
| | $ | 4,154 |
| | $ | 4,103 |
| | $ | 1,938 |
| | $ | 14,864 |
|
| | (1) | At December 31, 2018, Forcepoint’s fair value was estimated to exceed its net book value by approximately $1 billion. As discussed in “Note 11: Forcepoint Joint Venture,” we are required to determine Forcepoint’s fair value on a quarterly basis due to the accounting related to the redeemable noncontrolling interest. |
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