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Treasury risk management - Summary of Derivative Cash Flow Hedges (Details) - EUR (€)
€ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Derivative Cash Flow Hedges [Line Items]    
Foreign exchange cash inflows € 3,100 € 3,118
Foreign exchange cash outflows (3,180) (3,073)
Interest rate swaps cash inflows 2,072 3,121
Interest rate swaps cash outflows (1,886) (3,033)
Commodity contracts cash inflows 6 45
Commodity contracts cash outflows (38) (1)
Due within 1 year    
Disclosure Of Derivative Cash Flow Hedges [Line Items]    
Foreign exchange cash inflows 3,100 3,118
Foreign exchange cash outflows (3,180) (3,073)
Interest rate swaps cash inflows 564 1,170
Interest rate swaps cash outflows (464) (1,147)
Commodity contracts cash inflows 6 45
Commodity contracts cash outflows (38) (1)
Due between 1 and 2 years    
Disclosure Of Derivative Cash Flow Hedges [Line Items]    
Foreign exchange cash inflows 0 0
Foreign exchange cash outflows 0 0
Interest rate swaps cash inflows 502 530
Interest rate swaps cash outflows (473) (464)
Commodity contracts cash inflows 0 0
Commodity contracts cash outflows 0 0
Due between 2 and 3 years    
Disclosure Of Derivative Cash Flow Hedges [Line Items]    
Foreign exchange cash inflows 0 0
Foreign exchange cash outflows 0 0
Interest rate swaps cash inflows 27 473
Interest rate swaps cash outflows (13) (473)
Commodity contracts cash inflows 0 0
Commodity contracts cash outflows 0 0
Due between 3 and 4 years    
Disclosure Of Derivative Cash Flow Hedges [Line Items]    
Foreign exchange cash inflows 0 0
Foreign exchange cash outflows 0 0
Interest rate swaps cash inflows 27 26
Interest rate swaps cash outflows (13) (13)
Commodity contracts cash inflows 0 0
Commodity contracts cash outflows 0 0
Due between 4 and 5 years    
Disclosure Of Derivative Cash Flow Hedges [Line Items]    
Foreign exchange cash inflows 0 0
Foreign exchange cash outflows 0 0
Interest rate swaps cash inflows 952 26
Interest rate swaps cash outflows (923) (13)
Commodity contracts cash inflows 0 0
Commodity contracts cash outflows 0 0
Due after 5 years    
Disclosure Of Derivative Cash Flow Hedges [Line Items]    
Foreign exchange cash inflows 0 0
Foreign exchange cash outflows 0 0
Interest rate swaps cash inflows 0 896
Interest rate swaps cash outflows 0 (923)
Commodity contracts cash inflows 0 0
Commodity contracts cash outflows 0 0
Net carrying amount as shown in balance sheet    
Disclosure Of Derivative Cash Flow Hedges [Line Items]    
Foreign exchange cash inflows 0 0
Foreign exchange cash outflows (48) 67
Interest rate swaps cash inflows 119 0
Interest rate swaps cash outflows 0 (19)
Commodity contracts cash inflows 6 45
Commodity contracts cash outflows € (38) € (1)