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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [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, 2015 |  | $ | 2,874 |  |  | $ | 1,997 |  |  | $ | 2,109 |  |  | $ | 6,980 |
Goodwill acquired and adjusted during period |  |  | 4 |  |  |  | 70 |  |  |  | — |  |  |  | 74 |
Impairment |  |  | — |  |  |  | — |  |  |  | (972 | ) |  |  | (972 | )
Currency translation adjustments |  |  | (4 | ) |  |  | (9 | ) |  |  | (2 | ) |  |  | (15 | )
Balance at December 31, 2016 |  | $ | 2,874 |  |  | $ | 2,058 |  |  | $ | 1,135 |  |  | $ | 6,067 |
Goodwill acquired and adjusted during period |  |  | 37 |  |  |  | 41 |  |  |  | 11 |  |  |  | 89 |
Currency translation adjustments |  |  | 45 |  |  |  | 23 |  |  |  | 3 |  |  |  | 71 |
Balance at December 31, 2017 (1) |  | $ | 2,956 |  |  | $ | 2,122 |  |  | $ | 1,149 |  |  | $ | 6,227 |
(1) | Accumulated goodwill impairment was $2,457 million as of December 31, 2017.
Identified Intangible Assets Identified 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, 2015 |  | $ | 2,254 |  |  | $ | 1,296 |  |  | $ | 299 |  |  | $ | 3,849 |
Additions to intangible assets |  |  | 15 |  |  |  | 9 |  |  |  | — |  |  |  | 24 |
Amortization |  |  | (205 | ) |  |  | (106 | ) |  |  | (22 | ) |  |  | (333 | )
Currency translation adjustments |  |  | — |  |  |  | (8 | ) |  |  | (2 | ) |  |  | (10 | )
Balance at December 31, 2016 |  | $ | 2,064 |  |  | $ | 1,191 |  |  | $ | 275 |  |  | $ | 3,530 |
Additions to intangible assets |  |  | 18 |  |  |  | 41 |  |  |  | 2 |  |  |  | 61 |
Amortization |  |  | (208 | ) |  |  | (108 | ) |  |  | (23 | ) |  |  | (339 | )
Currency translation adjustments |  |  | 9 |  |  |  | 36 |  |  |  | 4 |  |  |  | 49 |
Balance at December 31, 2017 |  | $ | 1,883 |  |  | $ | 1,160 |  |  | $ | 258 |  |  | $ | 3,301 |
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, 2016: |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | $ | 4,024 |  |  | $ | (1,874 | ) |  | $ | 2,150 |
Trademarks |  |  | 878 |  |  |  | (290 | ) |  |  | 588 |
Patents |  |  | 585 |  |  |  | (345 | ) |  |  | 240 |
Indefinite-lived trade names |  |  | 384 |  |  |  | — |  |  |  | 384 |
Other |  |  | 463 |  |  |  | (295 | ) |  |  | 168 |
Total identified intangibles |  | $ | 6,334 |  |  | $ | (2,804 | ) |  | $ | 3,530 |
December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | $ | 4,074 |  |  | $ | (2,118 | ) |  | $ | 1,956 |
Trademarks |  |  | 885 |  |  |  | (317 | ) |  |  | 568 |
Patents |  |  | 602 |  |  |  | (384 | ) |  |  | 218 |
Indefinite-lived trade names |  |  | 384 |  |  |  | — |  |  |  | 384 |
Other |  |  | 499 |  |  |  | (324 | ) |  |  | 175 |
Total identified intangibles |  | $ | 6,444 |  |  | $ | (3,143 | ) |  | $ | 3,301 |
Changes in Carrying Amount of Service and Product Warranties | The changes in the carrying amount of service and product warranties are as follows (in millions):
Balance at December 31, 2015 |  | $ | 244 |
Net provisions for warranties issued during the year |  |  | 50 |
Amounts incurred |  |  | (127 | )
Currency translation adjustments and other |  |  | 5 |
Balance at December 31, 2016 |  | $ | 172 |
Net provisions for warranties issued during the year |  |  | 46 |
Amounts incurred |  |  | (86 | )
Currency translation adjustments and other |  |  | 3 |
Balance at December 31, 2017 |  | $ | 135 |
Computation of Weighted Average Basic and Diluted Shares Outstanding | The following table sets forth the computation of weighted average basic and diluted shares outstanding (in millions, except per share data):
|  | Years Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to Company |  | $ | (237 | ) |  | $ | (2,412 | ) |  | $ | (769 | )
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Basic—weighted average common shares outstanding |  |  | 377 |  |  |  | 376 |  |  |  | 387 |
Dilutive effect of employee stock options and other unvested stock awards |  |  | — |  |  |  | — |  |  |  | — |
Diluted outstanding shares |  |  | 377 |  |  |  | 376 |  |  |  | 387 |
Basic loss attributable to Company per share |  | $ | (0.63 | ) |  | $ | (6.41 | ) |  | $ | (1.99 | )
Diluted loss attributable to Company per share |  | $ | (0.63 | ) |  | $ | (6.41 | ) |  | $ | (1.99 | )
Cash dividends per share |  | $ | 0.20 |  |  | $ | 0.61 |  |  | $ | 1.84 |

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