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Business Segments and Geographic Areas - Business Segments (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 5,685 | $ 5,319 | $ 4,734 | $ 4,303 | $ 4,259 | $ 3,740 | $ 3,513 | $ 3,146 | $ 20,041 | $ 14,658 | $ 12,156
Operating profit |  |  |  |  |  |  |  |  | 3,557 | 2,937 | 2,447
Capital expenditures |  |  |  |  |  |  |  |  | 583 | 483 | 232
Depreciation and amortization |  |  |  |  |  |  |  |  | 628 | 555 | 507
Goodwill | 7,172 |  |  |  | 6,151 |  |  |  | 7,172 | 6,151 | 5,790
Total assets | 31,484 |  |  |  | 25,515 |  |  |  | 31,484 | 25,515 | 23,050
Rig Technology [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 10,107 | 7,788 | 6,965
Operating profit |  |  |  |  |  |  |  |  | 2,335 | 2,053 | 2,064
Capital expenditures |  |  |  |  |  |  |  |  | 150 | 125 | 59
Depreciation and amortization |  |  |  |  |  |  |  |  | 148 | 120 | 95
Goodwill | 2,386 |  |  |  | 1,959 |  |  |  | 2,386 | 1,959 | 1,854
Total assets | 11,758 |  |  |  | 8,375 |  |  |  | 11,758 | 8,375 | 7,778
Petroleum Services & Supplies [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 6,967 | 5,654 | 4,182
Operating profit |  |  |  |  |  |  |  |  | 1,501 | 1,072 | 585
Capital expenditures |  |  |  |  |  |  |  |  | 310 | 299 | 152
Depreciation and amortization |  |  |  |  |  |  |  |  | 424 | 397 | 384
Goodwill | 4,333 |  |  |  | 4,089 |  |  |  | 4,333 | 4,089 | 3,859
Total assets | 13,463 |  |  |  | 13,019 |  |  |  | 13,463 | 13,019 | 11,807
Distribution & Transmission [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 3,927 | 1,873 | 1,546
Operating profit |  |  |  |  |  |  |  |  | 185 | 135 | 78
Capital expenditures |  |  |  |  |  |  |  |  | 64 | 17 | 2
Depreciation and amortization |  |  |  |  |  |  |  |  | 25 | 14 | 7
Goodwill | 453 |  |  |  | 103 |  |  |  | 453 | 103 | 77
Total assets | 2,784 |  |  |  | 1,420 |  |  |  | 2,784 | 1,420 | 923
Unallocated/Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | (960) | (657) | (537)
Operating profit |  |  |  |  |  |  |  |  | (464) | (323) | (280)
Capital expenditures |  |  |  |  |  |  |  |  | 59 | 42 | 19
Depreciation and amortization |  |  |  |  |  |  |  |  | 31 | 24 | 21
Total assets | $ 3,479 |  |  |  | $ 2,701 |  |  |  | $ 3,479 | $ 2,701 | $ 2,542

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