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Equity affiliates, other investments and related parties - Other investments (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financial structure, financial costs and financial instruments      
Other investments (Note 8) $ 1,727 $ 1,133 $ 1,241
Equity securities publicly traded in active markets      
Financial structure, financial costs and financial instruments      
Other investments (Note 8) 50 54 59
Areva      
Financial structure, financial costs and financial instruments      
Other investments (Note 8)   17 22
Other equity securities publicly traded in active markets      
Financial structure, financial costs and financial instruments      
Other investments (Note 8)   37 37
Other equity securities      
Financial structure, financial costs and financial instruments      
Other investments (Note 8) 1,677 1,079 1,182
BBPP      
Financial structure, financial costs and financial instruments      
Other investments (Note 8) 62 62 62
BTC Limited      
Financial structure, financial costs and financial instruments      
Other investments (Note 8) 55 121 121
DUNKERQUE LNG SAS      
Financial structure, financial costs and financial instruments      
Other investments (Note 8) 144 133 116
Tellurian Investments Inc      
Financial structure, financial costs and financial instruments      
Other investments (Note 8) 207    
Total Eren Holding SA      
Financial structure, financial costs and financial instruments      
Other investments (Note 8) 285    
Greenflex      
Financial structure, financial costs and financial instruments      
Other investments (Note 8) 76    
Other equity securities (unit value below $50 million      
Financial structure, financial costs and financial instruments      
Other investments (Note 8) 848 763 883
Carrying amount      
Financial structure, financial costs and financial instruments      
Other investments (Note 8) 1,685 1,104 1,213
Carrying amount | Equity securities publicly traded in active markets      
Financial structure, financial costs and financial instruments      
Other investments (Note 8) 8 25 31
Carrying amount | Areva      
Financial structure, financial costs and financial instruments      
Other investments (Note 8)   17 22
Carrying amount | Other equity securities publicly traded in active markets      
Financial structure, financial costs and financial instruments      
Other investments (Note 8)   8 9
Carrying amount | Other equity securities      
Financial structure, financial costs and financial instruments      
Other investments (Note 8) 1,677 1,079 1,182
Carrying amount | BBPP      
Financial structure, financial costs and financial instruments      
Other investments (Note 8) 62 62 62
Carrying amount | BTC Limited      
Financial structure, financial costs and financial instruments      
Other investments (Note 8) 55 121 121
Carrying amount | DUNKERQUE LNG SAS      
Financial structure, financial costs and financial instruments      
Other investments (Note 8) 144 133 116
Carrying amount | Tellurian Investments Inc      
Financial structure, financial costs and financial instruments      
Other investments (Note 8) 207    
Carrying amount | Total Eren Holding SA      
Financial structure, financial costs and financial instruments      
Other investments (Note 8) 285    
Carrying amount | Greenflex      
Financial structure, financial costs and financial instruments      
Other investments (Note 8) 76    
Carrying amount | Other equity securities (unit value below $50 million      
Financial structure, financial costs and financial instruments      
Other investments (Note 8) 848 763 883
Unrealized gain (loss)      
Financial structure, financial costs and financial instruments      
Other investments (Note 8) 42 29 28
Unrealized gain (loss) | Equity securities publicly traded in active markets      
Financial structure, financial costs and financial instruments      
Other investments (Note 8) 42 29 28
Unrealized gain (loss) | Other equity securities publicly traded in active markets      
Financial structure, financial costs and financial instruments      
Other investments (Note 8)   29 28
Valuation allowance/Cumulative impairments      
Financial structure, financial costs and financial instruments      
Other investments (Note 8) $ (2,029) $ (1,633) $ (949)