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Income Taxes - Carried forward tax credits (Details) - Net operating losses and tax carry forwards - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets and liabilities      
Deferred tax assets $ 3,014 $ 3,267 $ 3,100
Canada      
Deferred tax assets and liabilities      
Deferred tax assets 798    
Australia      
Deferred tax assets and liabilities      
Deferred tax assets 515    
France      
Deferred tax assets and liabilities      
Deferred tax assets 498    
United States      
Deferred tax assets and liabilities      
Deferred tax assets 340    
Netherlands      
Deferred tax assets and liabilities      
Deferred tax assets 219    
Not later than one year      
Deferred tax assets and liabilities      
Deferred tax assets 75 130 175
Year 2      
Deferred tax assets and liabilities      
Deferred tax assets 64 109 114
Year 3      
Deferred tax assets and liabilities      
Deferred tax assets 60 60 56
Year 4      
Deferred tax assets and liabilities      
Deferred tax assets 24    
Year 5 and after      
Deferred tax assets and liabilities      
Deferred tax assets 1,330 1,154 850
Year 5 and after | Canada      
Deferred tax assets and liabilities      
Deferred tax assets 708    
Year 5 and after | United States      
Deferred tax assets and liabilities      
Deferred tax assets 340    
Year 5 and after | Netherlands      
Deferred tax assets and liabilities      
Deferred tax assets 219    
Unlimited      
Deferred tax assets and liabilities      
Deferred tax assets 1,461 $ 1,814 $ 1,905
Unlimited | Canada      
Deferred tax assets and liabilities      
Deferred tax assets 90    
Unlimited | Australia      
Deferred tax assets and liabilities      
Deferred tax assets 515    
Unlimited | France      
Deferred tax assets and liabilities      
Deferred tax assets $ 498