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Derivative financial instruments and hedge accounting (Details) - EUR (€)
€ in Millions
Dec. 31, 2020
Dec. 31, 2019
Derivative financial instruments and hedge accounting    
Derivative financial assets € 2,733 € 3,239
Offsetting (1,033) (612)
Net amount 1,700 2,627
- current 1,548 2,573
- non-current 152 54
Derivative financial liabilities 2,804 3,366
Offsetting (1,033) (612)
Net amount 1,771 2,754
- current 1,609 2,704
- non-current 162 50
Non-hedging derivatives    
Derivative financial instruments and hedge accounting    
Derivative financial assets 792 437
Derivative financial liabilities 734 321
Non-hedging derivatives | Currency    
Derivative financial instruments and hedge accounting    
Derivative financial assets 257 131
Derivative financial liabilities 136 48
Non-hedging derivatives | Currency | Currency swap contract | Level 2    
Derivative financial instruments and hedge accounting    
Derivative financial assets 125 97
Derivative financial liabilities 127 43
Non-hedging derivatives | Currency | Interest rate swap contract | Level 2    
Derivative financial instruments and hedge accounting    
Derivative financial assets 128 26
Derivative financial liabilities 2  
Non-hedging derivatives | Currency | Outright | Level 2    
Derivative financial instruments and hedge accounting    
Derivative financial assets 4 8
Derivative financial liabilities 7 5
Non-hedging derivatives | Interest rate risk    
Derivative financial instruments and hedge accounting    
Derivative financial assets 23 13
Derivative financial liabilities 74 34
Non-hedging derivatives | Interest rate risk | Interest rate swap contract | Level 2    
Derivative financial instruments and hedge accounting    
Derivative financial assets 23 13
Derivative financial liabilities 74 34
Non-hedging derivatives | Commodity price risk    
Derivative financial instruments and hedge accounting    
Derivative financial assets 512 293
Derivative financial liabilities 524 239
Non-hedging derivatives | Commodity price risk | Futures contract | Level 1    
Derivative financial instruments and hedge accounting    
Derivative financial assets 418 192
Derivative financial liabilities 447 181
Non-hedging derivatives | Commodity price risk | Over the counter contract | Level 2    
Derivative financial instruments and hedge accounting    
Derivative financial assets 89 89
Derivative financial liabilities 77 58
Non-hedging derivatives | Commodity price risk | Other contracts | Level 2    
Derivative financial instruments and hedge accounting    
Derivative financial assets 5 12
Trading derivatives    
Derivative financial instruments and hedge accounting    
Derivative financial assets 1,611 2,756
Derivative financial liabilities 1,979 2,288
Trading derivatives | Commodity price risk | Futures contract | Level 1    
Derivative financial instruments and hedge accounting    
Derivative financial assets 440 348
Derivative financial liabilities 525 313
Trading derivatives | Commodity price risk | Over the counter contract | Level 2    
Derivative financial instruments and hedge accounting    
Derivative financial assets 1,167 2,387
Derivative financial liabilities 1,451 1,953
Trading derivatives | Commodity price risk | Option contract | Level 2    
Derivative financial instruments and hedge accounting    
Derivative financial assets 4 21
Derivative financial liabilities 3 22
Cash flow hedge derivatives    
Derivative financial instruments and hedge accounting    
Derivative financial assets 328 35
Derivative financial liabilities 89 746
Cash flow hedge derivatives | Commodity price risk | Futures contract | Level 1    
Derivative financial instruments and hedge accounting    
Derivative financial assets 119 34
Derivative financial liabilities 8 148
Cash flow hedge derivatives | Commodity price risk | Over the counter contract | Level 2    
Derivative financial instruments and hedge accounting    
Derivative financial assets 209 1
Derivative financial liabilities 30 596
Cash flow hedge derivatives | Commodity price risk | Option contract | Level 2    
Derivative financial instruments and hedge accounting    
Derivative financial liabilities 51 2
Option embedded in convertible bonds | Level 2    
Derivative financial instruments and hedge accounting    
Derivative financial assets 2 11
Derivative financial liabilities € 2 € 11