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Business Segments and Geographic Areas (Details 2) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Business Segments                      
Revenue $ 4,259 $ 3,740 $ 3,513 $ 3,146 $ 3,172 $ 3,011 $ 2,941 $ 3,032 $ 14,658 $ 12,156 $ 12,712
Operating profit                 2,937 2,447 2,315
Capital expenditures                 483 232 250
Depreciation and amortization                 555 507 490
Goodwill 6,151       5,790       6,151 5,790 5,489
Total assets 25,515       23,050       25,515 23,050 21,532
Rig Technology [Member]
                      
Business Segments                      
Revenue                 7,788 6,965 8,093
Operating profit                 2,053 2,064 2,283
Capital expenditures                 125 59 61
Depreciation and amortization                 120 95 90
Goodwill 1,959       1,854       1,959 1,854 1,567
Total assets 8,375       7,778       8,375 7,778 7,203
Petroleum Services & Supplies [Member]
                      
Business Segments                      
Revenue                 5,654 4,182 3,745
Operating profit                 1,072 585 301
Capital expenditures                 299 152 161
Depreciation and amortization                 397 384 374
Goodwill 4,089       3,859       4,089 3,859 3,855
Total assets 13,019       11,807       13,019 11,807 11,601
Distribution & Transmission [Member]
                      
Business Segments                      
Revenue                 1,873 1,546 1,350
Operating profit                 135 78 50
Capital expenditures                 17 2 3
Depreciation and amortization                 14 7 8
Goodwill 103       77       103 77 67
Total assets 1,420       923       1,420 923 781
Unallocated/Elimination [Member]
                      
Business Segments                      
Revenue                 (657) (537) (476)
Operating profit                 (323) (280) (319)
Capital expenditures                 42 19 25
Depreciation and amortization                 24 21 18
Goodwill 0       0       0 0 0
Total assets $ 2,701       $ 2,542       $ 2,701 $ 2,542 $ 1,947