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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2015
Accounting Policies [Abstract] |
Goodwill is Identified by Segment | Goodwill is identified by segment as follows (in millions):
|  | Rig Systems |  |  | Rig Aftermarket |  |  | Wellbore Technologies |  |  | Completion & Production Solutions |  |  | Discontinued Operations |  |  | Total |
Balance at December 31, 2013 |  | $ | 1,279 |  |  | $ | 906 |  |  | $ | 4,425 |  |  | $ | 2,106 |  |  | $ | 333 |  |  | $ | 9,049 |
Goodwill acquired and adjusted during period |  |  | — |  |  |  | — |  |  |  | 17 |  |  |  | 150 |  |  |  | — |  |  |  | 167 |
Goodwill disposed of during the period |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (71 | ) |  |  | (332 | ) |  |  | (403 | )
Currency translation adjustments and other |  |  | (43 | ) |  |  | (29 | ) |  |  | (85 | ) |  |  | (116 | ) |  |  | (1 | ) |  |  | (274 | )
Balance at December 31, 2014 |  | $ | 1,236 |  |  | $ | 877 |  |  | $ | 4,357 |  |  | $ | 2,069 |  |  | $ | — |  |  | $ | 8,539 |
Goodwill acquired and adjusted during period |  |  | — |  |  |  | — |  |  |  | 8 |  |  |  | (8 | ) |  |  | — |  |  |  | — |
Impairment |  |  | — |  |  |  | — |  |  |  | (1,485 | ) |  |  | — |  |  |  | — |  |  |  | (1,485 | )
Currency translation adjustments and other |  |  | (4 | ) |  |  | — |  |  |  | (6 | ) |  |  | (64 | ) |  |  | — |  |  |  | (74 | )
Balance at December 31, 2015 |  | $ | 1,232 |  |  | $ | 877 |  |  | $ | 2,874 |  |  | $ | 1,997 |  |  | $ | — |  |  | $ | 6,980 |
Identified Intangible Assets Identified by Segment | The net book values of identified intangible assets are identified by segment as follows (in millions):
|  | Rig Systems |  |  | Rig Aftermarket |  |  | Wellbore Technologies |  |  | Completion & Production Solutions |  |  | Discontinued Operations |  |  | Total |
Balance at December 31, 2013 |  | $ | 232 |  |  | $ | 142 |  |  | $ | 2,999 |  |  | $ | 1,614 |  |  | $ | 68 |  |  | $ | 5,055 |
Additions to intangible assets |  |  | — |  |  |  | — |  |  |  | 5 |  |  |  | 54 |  |  |  | — |  |  |  | 59 |
Disposal of intangible assets |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (50 | ) |  |  | (67 | ) |  |  | (117 | )
Asset impairment |  |  | — |  |  |  | — |  |  |  | (104 | ) |  |  | — |  |  |  | — |  |  |  | (104 | )
Amortization |  |  | (22 | ) |  |  | (6 | ) |  |  | (218 | ) |  |  | (119 | ) |  |  | (1 | ) |  |  | (366 | )
Currency translation adjustments and other |  |  | (2 | ) |  |  | (3 | ) |  |  | (16 | ) |  |  | (62 | ) |  |  | — |  |  |  | (83 | )
Balance at December 31, 2014 |  | $ | 208 |  |  | $ | 133 |  |  | $ | 2,666 |  |  | $ | 1,437 |  |  | $ | — |  |  | $ | 4,444 |
Additions to intangible assets |  |  | — |  |  |  | — |  |  |  | 2 |  |  |  | 57 |  |  |  | — |  |  |  | 59 |
Asset impairment |  |  | (7 | ) |  |  | — |  |  |  | (173 | ) |  |  | (24 | ) |  |  | — |  |  |  | (204 | )
Amortization |  |  | (22 | ) |  |  | (6 | ) |  |  | (214 | ) |  |  | (114 | ) |  |  | — |  |  |  | (356 | )
Currency translation adjustments and other |  |  | (3 | ) |  |  | (4 | ) |  |  | (27 | ) |  |  | (60 | ) |  |  | — |  |  |  | (94 | )
Balance at December 31, 2015 |  | $ | 176 |  |  | $ | 123 |  |  | $ | 2,254 |  |  | $ | 1,296 |  |  | $ | — |  |  | $ | 3,849 |
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, 2014: |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | $ | 4,094 |  |  | $ | (1,379 | ) |  | $ | 2,715 |
Trademarks |  |  | 871 |  |  |  | (226 | ) |  |  | 645 |
Indefinite-lived trade names |  |  | 536 |  |  |  | — |  |  |  | 536 |
Other |  |  | 1,058 |  |  |  | (510 | ) |  |  | 548 |
Total identified intangibles |  | $ | 6,559 |  |  | $ | (2,115 | ) |  | $ | 4,444 |
December 31, 2015: |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | $ | 4,016 |  |  | $ | (1,630 | ) |  | $ | 2,386 |
Trademarks |  |  | 880 |  |  |  | (265 | ) |  |  | 615 |
Indefinite-lived trade names |  |  | 384 |  |  |  | — |  |  |  | 384 |
Other |  |  | 1,040 |  |  |  | (576 | ) |  |  | 464 |
Total identified intangibles |  | $ | 6,320 |  |  | $ | (2,471 | ) |  | $ | 3,849 |
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, 2013 |  | $ | 228 |
Net provisions for warranties issued during the year |  |  | 123 |
Amounts incurred |  |  | (78 | )
Currency translation adjustments and other |  |  | (1 | )
Balance at December 31, 2014 |  | $ | 272 |
Net provisions for warranties issued during the year |  |  | 92 |
Amounts incurred |  |  | (117 | )
Currency translation adjustments and other |  |  | (3 | )
Balance at December 31, 2015 |  | $ | 244 |
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, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations |  | $ | (769 | ) |  | $ | 2,450 |  |  | $ | 2,180 |
Income from discontinued operations |  | $ | — |  |  | $ | 52 |  |  | $ | 147 |
Net income (loss) attributable to Company |  | $ | (769 | ) |  | $ | 2,502 |  |  | $ | 2,327 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Basic—weighted average common shares outstanding |  |  | 387 |  |  |  | 428 |  |  |  | 426 |
Dilutive effect of employee stock options and other unvested stock awards |  |  | — |  |  |  | 2 |  |  |  | 2 |
Diluted outstanding shares |  |  | 387 |  |  |  | 430 |  |  |  | 428 |
Per share data: |  |  |  |  |  |  |  |  |  |  |  |
Basic: |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations |  | $ | (1.99 | ) |  | $ | 5.73 |  |  | $ | 5.11 |
Income from discontinued operations |  | $ | — |  |  | $ | 0.12 |  |  | $ | 0.35 |
Net income (loss) attributable to Company |  | $ | (1.99 | ) |  | $ | 5.85 |  |  | $ | 5.46 |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations |  | $ | (1.99 | ) |  | $ | 5.70 |  |  | $ | 5.09 |
Income from discontinued operations |  | $ | — |  |  | $ | 0.12 |  |  | $ | 0.35 |
Net income (loss) attributable to Company |  | $ | (1.99 | ) |  | $ | 5.82 |  |  | $ | 5.44 |
Cash dividends per share |  | $ | 1.84 |  |  | $ | 1.64 |  |  | $ | 0.91 |

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