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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2012
Goodwill is identified by segment | Goodwill is identified by segment as follows (in millions):
|  | Rig Technology |  |  | Petroleum Services & Supplies |  |  | Distribution & Transmission |  |  | Total |
Balance at December 31, 2010 |  | $ | 1,854 |  |  | $ | 3,859 |  |  | $ | 77 |  |  | $ | 5,790 |
Goodwill acquired during period |  |  | 117 |  |  |  | 233 |  |  |  | 27 |  |  |  | 377 |
Currency translation adjustments and other |  |  | (12 | ) |  |  | (3 | ) |  |  | (1 | ) |  |  | (16 | )
Balance at December 31, 2011 |  | $ | 1,959 |  |  | $ | 4,089 |  |  | $ | 103 |  |  | $ | 6,151 |
Goodwill acquired during the period |  |  | 412 |  |  |  | 241 |  |  |  | 347 |  |  |  | 1,000 |
Currency translation adjustments and other |  |  | 15 |  |  |  | 3 |  |  |  | 3 |  |  |  | 21 |
Balance at December 31, 2012 |  | $ | 2,386 |  |  | $ | 4,333 |  |  | $ | 453 |  |  | $ | 7,172 |
Identified Intangible Assets Identified by Segment | The net book value of identified intangible assets are identified by segment as follows (in millions):
|  | Rig Technology |  |  | Petroleum Services & Supplies |  |  | Distribution & Transmission |  |  | Total |
Balance at December 31, 2010 |  | $ | 666 |  |  | $ | 3,432 |  |  | $ | 5 |  |  | $ | 4,103 |
Additions to intangible assets |  |  | 70 |  |  |  | 176 |  |  |  | 27 |  |  |  | 273 |
Amortization |  |  | (60 | ) |  |  | (213 | ) |  |  | (3 | ) |  |  | (276 | )
Currency translation adjustments and other |  |  | (22 | ) |  |  | (4 | ) |  |  | (1 | ) |  |  | (27 | )
Balance at December 31, 2011 |  | $ | 654 |  |  | $ | 3,391 |  |  | $ | 28 |  |  | $ | 4,073 |
Additions to intangible assets |  |  | 545 |  |  |  | 380 |  |  |  | 56 |  |  |  | 981 |
Amortization |  |  | (76 | ) |  |  | (224 | ) |  |  | (5 | ) |  |  | (305 | )
Currency translation adjustments and other |  |  | (11 | ) |  |  | 3 |  |  |  | 2 |  |  |  | (6 | )
Balance at December 31, 2012 |  | $ | 1,112 |  |  | $ | 3,550 |  |  | $ | 81 |  |  | $ | 4,743 |
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, 2011: |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | $ | 3,044 |  |  | $ | (717 | ) |  | $ | 2,327 |
Trademarks |  |  | 716 |  |  |  | (122 | ) |  |  | 594 |
Indefinite-lived trade names |  |  | 643 |  |  |  | — |  |  |  | 643 |
Other |  |  | 751 |  |  |  | (242 | ) |  |  | 509 |
Total identified intangibles |  | $ | 5,154 |  |  | $ | (1,081 | ) |  | $ | 4,073 |
December 31, 2012: |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | $ | 3,522 |  |  | $ | (907 | ) |  | $ | 2,615 |
Trademarks |  |  | 877 |  |  |  | (152 | ) |  |  | 725 |
Indefinite-lived trade names |  |  | 643 |  |  |  | — |  |  |  | 643 |
Other |  |  | 1,087 |  |  |  | (327 | ) |  |  | 760 |
Total identified intangibles |  | $ | 6,129 |  |  | $ | (1,386 | ) |  | $ | 4,743 |
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, 2010 |  | $ | 215 |
Net provisions for warranties issued during the year |  |  | 40 |
Amounts incurred |  |  | (47 | )
Currency translation adjustments and other |  |  | 3 |
Balance at December 31, 2011 |  | $ | 211 |
Net provisions for warranties issued during the year |  |  | 51 |
Amounts incurred |  |  | (76 | )
Currency translation adjustments and other |  |  | 8 |
Balance at December 31, 2012 |  | $ | 194 |
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, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Company |  | $ | 2,491 |  |  | $ | 1,994 |  |  | $ | 1,667 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Basic—weighted average common shares outstanding |  |  | 425 |  |  |  | 422 |  |  |  | 417 |
Dilutive effect of employee stock options and other unvested stock awards |  |  | 2 |  |  |  | 2 |  |  |  | 2 |
Diluted outstanding shares |  |  | 427 |  |  |  | 424 |  |  |  | 419 |
Basic earnings attributable to Company per share |  | $ | 5.86 |  |  | $ | 4.73 |  |  | $ | 3.99 |
Diluted earnings attributable to Company per share |  | $ | 5.83 |  |  | $ | 4.70 |  |  | $ | 3.98 |
Cash dividends per share |  | $ | 0.49 |  |  | $ | 0.45 |  |  | $ | 0.41 |

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