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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2021
Goodwill And Intangible Assets Disclosure [Abstract] |
Goodwill Identified, by Segment | Goodwill is identified by segment as follows (in millions):
|  | Wellbore Technologies |  |  | Completion & Production Solutions |  |  | Rig Technologies |  |  | Total |
Balance at December 31, 2019 |  |  | 843 |  |  |  | 1,054 |  |  |  | 910 |  |  |  | 2,807 |
Goodwill acquired during period |  |  | 4 |  |  |  | — |  |  |  | — |  |  |  | 4 |
Impairment |  |  | (517 | ) |  |  | (580 | ) |  |  | (198 | ) |  |  | (1,295 | )
Currency translation adjustments and other |  |  | (22 | ) |  |  | (1 | ) |  |  | — |  |  |  | (23 | )
Balance at December 31, 2020 |  | $ | 308 |  |  | $ | 473 |  |  | $ | 712 |  |  | $ | 1,493 |
Goodwill acquired during period |  |  | 34 |  |  |  | — |  |  |  | — |  |  |  | 34 |
Balance at December 31, 2021 (1) |  | $ | 342 |  |  | $ | 473 |  |  | $ | 712 |  |  | $ | 1,527 |
(1) | Accumulated goodwill impairment was $7,261 million as of December 31, 2021.
Identified Intangible Assets, by Segment | The net book values of identified intangible assets are identified by segment as follows (in millions):
|  | Wellbore Technologies |  |  | Completion & Production Solutions |  |  | Rig Technologies |  |  | Total |
Balance at December 31, 2019 |  | $ | 326 |  |  | $ | 275 |  |  | $ | 251 |  |  | $ | 852 |
Additions to intangible assets |  |  | 20 |  |  |  | — |  |  |  | — |  |  |  | 20 |
Impairment |  |  | (78 | ) |  |  | (214 | ) |  |  | — |  |  |  | (292 | )
Amortization |  |  | (12 | ) |  |  | (9 | ) |  |  | (28 | ) |  |  | (49 | )
Currency translation adjustments |  |  | (3 | ) |  |  | (5 | ) |  |  | 4 |  |  |  | (4 | )
Balance at December 31, 2020 |  | $ | 253 |  |  | $ | 47 |  |  | $ | 227 |  |  | $ | 527 |
Additions to intangible assets |  |  | 22 |  |  |  | — |  |  |  | — |  |  |  | 22 |
Amortization |  |  | (10 | ) |  |  | (5 | ) |  |  | (28 | ) |  |  | (43 | )
Currency translation adjustments |  |  | (1 | ) |  |  | — |  |  |  | (2 | ) |  |  | (3 | )
Balance at December 31, 2021 |  | $ | 264 |  |  | $ | 42 |  |  | $ | 197 |  |  | $ | 503 |
Identified Intangible Assets, by Major Classification | Identified intangible assets by major classification consist of the following (in millions):
|  | Gross |  |  | Accumulated Amortization |  |  | Net Book Value |
December 31, 2020: |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | $ | 475 |  |  | $ | (300 | ) |  | $ | 175 |
Trademarks |  |  | 175 |  |  |  | (116 | ) |  |  | 59 |
Patents |  |  | 115 |  |  |  | (53 | ) |  |  | 62 |
Indefinite-lived trade names |  |  | 196 |  |  |  | — |  |  |  | 196 |
Other |  |  | 94 |  |  |  | (59 | ) |  |  | 35 |
Total identified intangibles |  | $ | 1,055 |  |  | $ | (528 | ) |  | $ | 527 |
December 31, 2021: |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | $ | 471 |  |  | $ | (323 | ) |  | $ | 148 |
Trademarks |  |  | 174 |  |  |  | (122 | ) |  |  | 52 |
Patents |  |  | 145 |  |  |  | (59 | ) |  |  | 86 |
Indefinite-lived trade names |  |  | 196 |  |  |  | — |  |  |  | 196 |
Other |  |  | 82 |  |  |  | (61 | ) |  |  | 21 |
Total identified intangibles |  | $ | 1,068 |  |  | $ | (565 | ) |  | $ | 503 |

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