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Trade and other receivables (Details 3) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Disclosure Of Trade And Other Receivables [Line Items]      
Retail customers – Gas & Power Gross amount € 17,251    
Allowance for doubtful accounts (3,150)    
Net amount € 14,101 € 14,156 € 15,421
Expected loss (%)    
Retail customers [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Retail customers – Gas & Power Gross amount € 2,374    
Allowance for doubtful accounts (857)    
Net amount € 1,517    
Expected loss (%) 36.10%    
Not-past due [member] | Retail customers [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Retail customers – Gas & Power Gross amount € 1,231    
Allowance for doubtful accounts (20)    
Net amount € 1,211    
Expected loss (%) 1.60%    
from 0 to 3 months [Member] | Retail customers [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Retail customers – Gas & Power Gross amount € 94    
Allowance for doubtful accounts (18)    
Net amount € 76    
Expected loss (%) 19.10%    
from 3 to 6 months [Member] | Retail customers [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Retail customers – Gas & Power Gross amount € 48    
Allowance for doubtful accounts (18)    
Net amount € 30    
Expected loss (%) 37.50%    
from 6 to 12 months [Member] | Retail customers [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Retail customers – Gas & Power Gross amount € 95    
Allowance for doubtful accounts (56)    
Net amount € 39    
Expected loss (%) 58.90%    
over 12 months [Member] | Retail customers [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Retail customers – Gas & Power Gross amount € 906    
Allowance for doubtful accounts (745)    
Net amount € 161    
Expected loss (%) 82.20%    
Retail customers – Gas & Power Retail [member] | Retail customers [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Retail customers – Gas & Power Gross amount € 1,276    
Retail customers – Gas & Power Retail [member] | Not-past due [member] | Retail customers [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Retail customers – Gas & Power Gross amount 575    
Retail customers – Gas & Power Retail [member] | from 0 to 3 months [Member] | Retail customers [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Retail customers – Gas & Power Gross amount 49    
Retail customers – Gas & Power Retail [member] | from 3 to 6 months [Member] | Retail customers [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Retail customers – Gas & Power Gross amount 34    
Retail customers – Gas & Power Retail [member] | from 6 to 12 months [Member] | Retail customers [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Retail customers – Gas & Power Gross amount 64    
Retail customers – Gas & Power Retail [member] | over 12 months [Member] | Retail customers [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Retail customers – Gas & Power Gross amount 554    
Retail customers – Gas & Power Middle [member] | Retail customers [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Retail customers – Gas & Power Gross amount 883    
Retail customers – Gas & Power Middle [member] | Not-past due [member] | Retail customers [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Retail customers – Gas & Power Gross amount 449    
Retail customers – Gas & Power Middle [member] | from 0 to 3 months [Member] | Retail customers [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Retail customers – Gas & Power Gross amount 43    
Retail customers – Gas & Power Middle [member] | from 3 to 6 months [Member] | Retail customers [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Retail customers – Gas & Power Gross amount 13    
Retail customers – Gas & Power Middle [member] | from 6 to 12 months [Member] | Retail customers [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Retail customers – Gas & Power Gross amount 29    
Retail customers – Gas & Power Middle [member] | over 12 months [Member] | Retail customers [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Retail customers – Gas & Power Gross amount 349    
Retail customers – Gas & Power Other [member] | Retail customers [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Retail customers – Gas & Power Gross amount 215    
Retail customers – Gas & Power Other [member] | Not-past due [member] | Retail customers [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Retail customers – Gas & Power Gross amount 207    
Retail customers – Gas & Power Other [member] | from 0 to 3 months [Member] | Retail customers [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Retail customers – Gas & Power Gross amount 2    
Retail customers – Gas & Power Other [member] | from 3 to 6 months [Member] | Retail customers [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Retail customers – Gas & Power Gross amount 1    
Retail customers – Gas & Power Other [member] | from 6 to 12 months [Member] | Retail customers [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Retail customers – Gas & Power Gross amount 2    
Retail customers – Gas & Power Other [member] | over 12 months [Member] | Retail customers [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Retail customers – Gas & Power Gross amount € 3