v2.4.0.8
Goodwill and Other Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Accumulated impairment        
Impairment associated with continuing operations $ (118) $ (118) $ (5,200)  
Net carrying amount        
Net carrying amount at the beginning of the period       2,987
Impairment associated with continuing operations (118) (118) (5,200)  
Net carrying amount at the end of the period   2,987   2,987
Contract drilling services
        
Goodwill        
Gross carrying amount at the beginning of the period 10,911 10,911   10,799
Reclassified balance associated with discontinued operations   (112)    
Gross carrying amount at the end of the period   10,799 10,911 10,799
Accumulated impairment        
Accumulated impairment at the beginning of the period (7,694) (7,694)   (7,812)
Impairment associated with continuing operations   (118) (5,200)  
Accumulated impairment at the end of the period   (7,812) (7,694) (7,812)
Net carrying amount        
Net carrying amount at the beginning of the period 3,217 3,217   2,987
Impairment associated with continuing operations   (118) (5,200)  
Reclassified balance associated with discontinued operations   (112)    
Net carrying amount at the end of the period   $ 2,987 $ 3,217 $ 2,987