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Income taxes - Carried forward tax credits (Details) - Net operating losses and tax carry forwards - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets and liabilities      
Deferred tax assets $ 3,752 $ 3,779 $ 3,014
Australia      
Deferred tax assets and liabilities      
Deferred tax assets 1,057    
United States      
Deferred tax assets and liabilities      
Deferred tax assets 715    
Canada      
Deferred tax assets and liabilities      
Deferred tax assets 675    
France      
Deferred tax assets and liabilities      
Deferred tax assets 520    
United Kingdom      
Deferred tax assets and liabilities      
Deferred tax assets 313    
Not later than one year      
Deferred tax assets and liabilities      
Deferred tax assets 71 90 75
Year 2      
Deferred tax assets and liabilities      
Deferred tax assets 48 70 64
Year 3      
Deferred tax assets and liabilities      
Deferred tax assets 27 38 60
Year 4      
Deferred tax assets and liabilities      
Deferred tax assets 19 32 24
Year 5 and after      
Deferred tax assets and liabilities      
Deferred tax assets 1,310 1,423 1,330
Year 5 and after | United States      
Deferred tax assets and liabilities      
Deferred tax assets 595    
Year 5 and after | Canada      
Deferred tax assets and liabilities      
Deferred tax assets 675    
Unlimited      
Deferred tax assets and liabilities      
Deferred tax assets 2,277 $ 2,126 $ 1,461
Unlimited | Australia      
Deferred tax assets and liabilities      
Deferred tax assets 1,057    
Unlimited | United States      
Deferred tax assets and liabilities      
Deferred tax assets 120    
Unlimited | France      
Deferred tax assets and liabilities      
Deferred tax assets 520    
Unlimited | United Kingdom      
Deferred tax assets and liabilities      
Deferred tax assets $ 313