XML 19 R48.htm IDEA: XBRL DOCUMENT v2.4.0.6
Summary of Significant Accounting Policies (Details Textual) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2010
Jun. 30, 2009
Rig
Mar. 31, 2009
Rig
Dec. 31, 2008
Rig
Dec. 31, 2011
Y
Dec. 31, 2010
Dec. 31, 2009
Indefinite-lived Intangible Assets by Major Class [Line Items]              
Indefinite-lived intangible assets         $ 600    
Summary of Significant Accounting Policies (Textual) [Abstract]              
Maturity period of investments description         Three Months or less    
Maturity period of investments         3 months    
Minimum Derivative Financial Instrument's Term (Months)         2 months    
Maximum Derivative Financial Instrument's Term (Months)         24 months    
Derivative Assets         26 47  
Derivative Liabilities         96 23  
Fair Value of Foreign Currency Forward Contracts         70    
Allowances for excess and obsolete inventories         281 270  
Depreciation expense related to property, plant and equipment         279 262 249
Impairment of long-lived assets         0 0 0
Goodwill         6,151 5,790 5,489
Indefinite-lived intangible assets         600    
Estimated useful lives of intangible assets, Minimum         2    
Estimated useful lives of intangible assets, Maximum         30    
Amortization expense         280    
Number of years as first period of amortization         5    
World wide average rig count   2,009 2,681 3,395      
Percentage decrease comparing Previous quarters     25.00% 41.00%      
Impairment charge incurred   147         147
Devalued asset charges 27            
Written down charges of accounts receivable 11            
Net investment in Venezuela         27    
Net foreign currency transaction gains (losses)         10 30 79
Net allowances for doubtful accounts         107 107  
Compensation cost charged against income for share-based compensation arrangements         73 66 68
Income tax benefit recognized for share-based compensation arrangements         17 20 21
Anti-dilutive stock options outstanding         3 8 4
Carrying amount of goodwill impairment test         more than 50 percent    
Trade Names [Member]
              
Indefinite-lived Intangible Assets by Major Class [Line Items]              
Indefinite-lived intangible assets         643    
Summary of Significant Accounting Policies (Textual) [Abstract]              
Indefinite-lived intangible assets         $ 643