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Asset Impairments (Tables) | 12 Months Ended
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Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract] |
Goodwill Identified, by Segment | The Company has approximately $2.8 billion of goodwill, by segment as follows (in millions):
|  | Wellbore Technologies |  |  | Completion & Production Solutions |  |  | Rig Technologies |  |  | Total |
Balance at December 31, 2017 |  | $ | 2,956 |  |  | $ | 2,122 |  |  | $ | 1,149 |  |  | $ | 6,227 |
Goodwill acquired and adjusted during period |  |  | 64 |  |  |  | (33 | ) |  |  | 71 |  |  |  | 102 |
Currency translation adjustments |  |  | (9 | ) |  |  | (48 | ) |  |  | (8 | ) |  |  | (65 | )
Balance at December 31, 2018 |  |  | 3,011 |  |  |  | 2,041 |  |  |  | 1,212 |  |  |  | 6,264 |
Goodwill acquired and adjusted during period |  |  | 9 |  |  |  | 40 |  |  |  | 13 |  |  |  | 62 |
Impairment |  |  | (2,178 | ) |  |  | (1,019 | ) |  |  | (312 | ) |  |  | (3,509 | )
Currency translation adjustments |  |  | 1 |  |  |  | (8 | ) |  |  | (3 | ) |  |  | (10 | )
Balance at December 31, 2019 (1) |  | $ | 843 |  |  | $ | 1,054 |  |  | $ | 910 |  |  | $ | 2,807 |
(1) | Accumulated goodwill impairment was $5,966 million as of December 31, 2019.
Identified Intangible Assets, by Segment | The Company has approximately $852 million of identified intangible assets, by segment as follows (in millions):
|  | Wellbore Technologies |  |  | Completion & Production Solutions |  |  | Rig Technologies |  |  | Total |
Balance at December 31, 2017 |  | $ | 1,883 |  |  | $ | 1,160 |  |  | $ | 258 |  |  | $ | 3,301 |
Additions to intangible assets |  |  | 41 |  |  |  | 3 |  |  |  | 55 |  |  |  | 99 |
Amortization |  |  | (201 | ) |  |  | (111 | ) |  |  | (29 | ) |  |  | (341 | )
Currency translation adjustments |  |  | 12 |  |  |  | (47 | ) |  |  | (4 | ) |  |  | (39 | )
Balance at December 31, 2018 |  | $ | 1,735 |  |  | $ | 1,005 |  |  | $ | 280 |  |  | $ | 3,020 |
Impairment |  |  | (1,314 | ) |  |  | (690 | ) |  |  | — |  |  |  | (2,004 | )
Additions to intangible assets |  |  | 6 |  |  |  | 11 |  |  |  | — |  |  |  | 17 |
Amortization |  |  | (94 | ) |  |  | (56 | ) |  |  | (28 | ) |  |  | (178 | )
Currency translation adjustments |  |  | (7 | ) |  |  | 5 |  |  |  | (1 | ) |  |  | (3 | )
Balance at December 31, 2019 |  | $ | 326 |  |  | $ | 275 |  |  | $ | 251 |  |  | $ | 852 |
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, 2018: |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | $ | 4,078 |  |  | $ | (2,352 | ) |  | $ | 1,726 |
Trademarks |  |  | 891 |  |  |  | (341 | ) |  |  | 550 |
Patents |  |  | 661 |  |  |  | (414 | ) |  |  | 247 |
Indefinite-lived trade names |  |  | 383 |  |  |  | — |  |  |  | 383 |
Other |  |  | 491 |  |  |  | (377 | ) |  |  | 114 |
Total identified intangibles |  | $ | 6,504 |  |  | $ | (3,484 | ) |  | $ | 3,020 |
December 31, 2019: |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | $ | 598 |  |  | $ | (305 | ) |  | $ | 293 |
Trademarks |  |  | 190 |  |  |  | (123 | ) |  |  | 67 |
Patents |  |  | 121 |  |  |  | (47 | ) |  |  | 74 |
Indefinite-lived trade names |  |  | 280 |  |  |  | — |  |  |  | 280 |
Other |  |  | 283 |  |  |  | (145 | ) |  |  | 138 |
Total identified intangibles |  | $ | 1,472 |  |  | $ | (620 | ) |  | $ | 852 |

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