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Marketable securities (Details)
In Millions, unless otherwise specified
 12 Months Ended 1 Months Ended 6 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2012
USD ($)
May 31, 2012
SapuraCrest Bhd [Member]
USD ($)
Jun. 30, 2012
SapuraCrest Bhd [Member]
USD ($)
Dec. 31, 2011
SapuraCrest Bhd [Member]
Dec. 31, 2012
Sapura Kencana [Member]
USD ($)
Dec. 31, 2011
Sapura Kencana [Member]
USD ($)
Jun. 30, 2012
Sapura Kencana [Member]
May 30, 2012
Sapura Kencana [Member]
May 17, 2012
Sapura Kencana [Member]
Dec. 31, 2012
Ensco [Member]
USD ($)
Dec. 31, 2011
Ensco [Member]
USD ($)
Dec. 31, 2012
Petromena [Member]
USD ($)
Dec. 31, 2011
Petromena [Member]
USD ($)
Dec. 31, 2012
Petromena [Member]
NOK
Dec. 31, 2012
Golden Close [Member]
USD ($)
Dec. 31, 2011
Golden Close [Member]
USD ($)
Marketable securities [Abstract]                                      
Original cost $ 128 $ 24           $ 124 $ 0       $ 0 $ 5 $ 4 $ 4   $ 0 $ 15
Unrealized gain on marketable securities, net 205 0                                  
Carrying value 333 24           329 0       0 4 4 4   0 16
Marketable Securities, Investee [Line Items]                                      
Ownership interest (in hundredths)             23.59% 11.79%   6.40%   11.80%              
Recognized gain 169 0 0   169 84                          
Percentage of marketable securities held (in hundredths)               6.40%     6.40%       81.10%        
Face amount of bond securities held                                 2,000    
Historic cost 24             0         5   4     15  
Fair Market value adjustments recognized via OCI 1     206       0         0   0     1  
Fair Market value adjustments recognized via P&L 0 (1)           0 0       0 (1) 0 0   0 0
Net book value 24             0         4   4     16  
Additions 237             237         0   0     0  
Fair market value adjustments recognized via OCI 84             84         0   0     0  
Release of OCI into profit & loss (85) (416) 0         (84)         0   0     (1)  
Realization of historic cost (132)             (113)         (4)   0     (15)  
Other than temporary impairments 0 (10) (15)         0         0   0     0  
Historic cost 128 24           124 0       0 5 4 4   0 15
Fair Market value adjustments recognized via OCI 205 (291) (25)         205         0   0     0  
Fair Market value adjustments recognized via P&L 0 (1)           0 0       0 (1) 0 0   0 0
Net book value $ 333 $ 24           $ 329 $ 0       $ 0 $ 4 $ 4 $ 4   $ 0 $ 16