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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jan. 23, 2015
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2014
Income Taxes [Abstract]        
Income tax provision   $ (2) $ (12)  
Loss before income taxes   $ (36) $ (82)  
Effective tax rate   (6.00%) (15.00%)  
Positive Outcome of Litigation [Member] | Settled Litigation [Member] | Anadarko Litigation [Member]        
Gain Contingencies [Line Items]        
Settlement amount paid $ 5,200     $ 5,200
Interest accrued on the settlement $ 65      
Deferred tax assets       $ 2,000
Trust expenditures expected from litigation proceeds   $ 2,800    
Trusts and Other Governmental Entities [Member]        
Gain Contingencies [Line Items]        
Percentage of settlement to be received from judgment   88.00%    
Tort Trust [Member]        
Gain Contingencies [Line Items]        
Percentage of settlement to be received from judgment   12.00%    
Australia [Member]        
Effective Income Tax Rate Reconciliation [Line Items]        
Statutory tax rate     30.00%  
South Africa [Member]        
Effective Income Tax Rate Reconciliation [Line Items]        
Statutory tax rate   28.00%    
Netherlands [Member]        
Effective Income Tax Rate Reconciliation [Line Items]        
Statutory tax rate   25.00%    
United Kingdom [Member]        
Effective Income Tax Rate Reconciliation [Line Items]        
Statutory tax rate   20.00%    
U.S. Federal [Member]        
Effective Income Tax Rate Reconciliation [Line Items]        
Statutory tax rate   35.00%    
Switzerland [Member]        
Effective Income Tax Rate Reconciliation [Line Items]        
Statutory tax rate   8.50%    
Jersey, U.K. [Member]        
Effective Income Tax Rate Reconciliation [Line Items]        
Statutory tax rate   0.00%