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Subsequent events (Details)
€ in Millions
3 Months Ended
Jan. 01, 2020
$ / bbl
Mar. 31, 2020
$ / MMBTU
$ / bbl
Mar. 18, 2020
Dec. 31, 2019
EUR (€)
$ / MMBTU
Dec. 31, 2018
EUR (€)
Subsequent events          
Italian spot gas benchmark reference price | $ / MMBTU       7.8  
Liquidity reserve       € 6,760 € 6,552
Cash and cash equivalents       5,994 10,836
Contractual obligations       142,662  
Short term debt          
Subsequent events          
Debt maturity value       2,452 2,182
within 1 year          
Subsequent events          
Contractual obligations       10,679  
within 1 year | Short term debt          
Subsequent events          
Debt maturity value       2,452 2,182
Uncommitted borrowing facilities          
Subsequent events          
Undrawn borrowing facilities       13,299 12,484
Committed borrowing facilities          
Subsequent events          
Undrawn borrowing facilities       4,667 € 5,214
Impact of COVID-19          
Subsequent events          
Increase (decrease) in oil price, percentage     (50.00%)    
Brent oil price | $ / bbl 65 51      
Increase (decrease) in oil price versus same period of previous year, percentage   (20.00%)      
Italian spot gas benchmark reference price | $ / MMBTU   3.7      
Increase (decrease) in Italian spot gas benchmark reference price versus same period of previous year   (50.00%)      
Liquidity reserve       6,800  
Cash and cash equivalents       6,000  
Impact of COVID-19 | within 1 year | Take-or-pay obligations under long-term gas contracts and other similar obligations          
Subsequent events          
Contractual obligations       8,000  
Impact of COVID-19 | within 1 year | Long-term debt          
Subsequent events          
Debt maturity value       3,200  
Impact of COVID-19 | within 1 year | Short term debt          
Subsequent events          
Debt maturity value       2,450  
Impact of COVID-19 | Uncommitted borrowing facilities          
Subsequent events          
Undrawn borrowing facilities       13,299  
Impact of COVID-19 | Committed borrowing facilities          
Subsequent events          
Undrawn borrowing facilities       € 4,667