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Treasury risk management - Summary of Derivative Cash Flow Hedges (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Derivative Cash Flow Hedges [Line Items]    
Foreign exchange cash inflows € 2,807 € 3,100
Foreign exchange cash outflows (2,842) (3,180)
Interest rate swaps cash inflows 3,050 2,072
Interest rate swaps cash outflows (3,084) (1,886)
Commodity contracts cash inflows 8 6
Commodity contracts cash outflows (22) (38)
Due within 1 year    
Disclosure Of Derivative Cash Flow Hedges [Line Items]    
Foreign exchange cash inflows 2,807 3,100
Foreign exchange cash outflows (2,842) (3,180)
Interest rate swaps cash inflows 526 564
Interest rate swaps cash outflows (528) (464)
Commodity contracts cash inflows 8 6
Commodity contracts cash outflows (22) (38)
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 68 502
Interest rate swaps cash outflows (68) (473)
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 68 27
Interest rate swaps cash outflows (68) (13)
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 959 27
Interest rate swaps cash outflows (978) (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 42 952
Interest rate swaps cash outflows (55) (923)
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 1,387 0
Interest rate swaps cash outflows (1,387) 0
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 (6) (48)
Interest rate swaps cash inflows 48 119
Interest rate swaps cash outflows 0 0
Commodity contracts cash inflows 8 6
Commodity contracts cash outflows € (22) € (38)