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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