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Financial risk management - Narrative (Details)
₩ in Billions, ¥ in Billions, ¥ in Billions, $ in Billions, $ in Billions
 12 Months Ended
Dec. 31, 2024
EUR (€)
eurobond
Dec. 31, 2023
EUR (€)
Dec. 31, 2022
EUR (€)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
JPY (¥)
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
KRW (₩)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
JPY (¥)
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
KRW (₩)
Dec. 31, 2023
CNY (¥)
Derivative Instruments, Gain (Loss) [Line Items]                          
Net gain (loss) from effective cash flow hedges € 8,900,000 € (600,000) € 66,500,000                    
Gain (loss) on foreign currency fair value hedge derivatives 31,400,000 52,400,000 3,600,000                    
Gain (loss) on foreign currency cash flow hedge ineffectiveness € 0 0 € 0                    
Decrease of interest rates (in percentage) 0.010     0.010 0.010 0.010 0.010 0.010          
Supplier finance program, termination notice, period 30 days                        
Derivative asset, statement of financial position [extensible enumeration] Other assets, Other non-current assets      Other assets, Other non-current assets  Other assets, Other non-current assets  Other assets, Other non-current assets  Other assets, Other non-current assets  Other assets, Other non-current assets           
Derivative asset, noncurrent, statement of financial position [extensible enumeration] Other non-current assets      Other non-current assets  Other non-current assets  Other non-current assets  Other non-current assets  Other non-current assets           
Derivative asset, current, statement of financial position [extensible enumeration] Other assets     Other assets Other assets Other assets Other assets Other assets          
Derivative liability, noncurrent, statement of financial position [extensible enumeration] Accrued and other liabilities     Accrued and other liabilities Accrued and other liabilities Accrued and other liabilities Accrued and other liabilities Accrued and other liabilities          
Derivative liability, current, Statement of Financial Position [extensible enumeration] Accrued and other liabilities     Accrued and other liabilities Accrued and other liabilities Accrued and other liabilities Accrued and other liabilities Accrued and other liabilities          
Number of eurobonds outstanding | eurobond 6                        
Fair value assets (liabilities) transfers between levels amount € 0 0                      
Designated as Hedging Instrument                          
Derivative Instruments, Gain (Loss) [Line Items]                          
Number of eurobonds outstanding | eurobond 4                        
Debt Instrument, Face Amount € 3,250,000,000                        
Not Designated as Hedging Instrument                          
Derivative Instruments, Gain (Loss) [Line Items]                          
Number of eurobonds outstanding | eurobond 2                        
Debt Instrument, Face Amount € 1,500,000,000                        
Interest rate swaps                          
Derivative Instruments, Gain (Loss) [Line Items]                          
Notional amount € 3,250,000,000 3,250,000,000                      
Interest rate swaps | Fair value hedges                          
Derivative Instruments, Gain (Loss) [Line Items]                          
Derivative asset, statement of financial position [extensible enumeration] Other assets, Other non-current assets      Other assets, Other non-current assets  Other assets, Other non-current assets  Other assets, Other non-current assets  Other assets, Other non-current assets  Other assets, Other non-current assets           
Derivative asset, noncurrent, statement of financial position [extensible enumeration] Other non-current assets      Other non-current assets  Other non-current assets  Other non-current assets  Other non-current assets  Other non-current assets           
Derivative liability, statement of financial position [extensible enumeration] Accrued and other liabilities, Accrued and other liabilities     Accrued and other liabilities, Accrued and other liabilities Accrued and other liabilities, Accrued and other liabilities Accrued and other liabilities, Accrued and other liabilities Accrued and other liabilities, Accrued and other liabilities Accrued and other liabilities, Accrued and other liabilities          
Derivative liability, noncurrent, statement of financial position [extensible enumeration] Accrued and other liabilities     Accrued and other liabilities Accrued and other liabilities Accrued and other liabilities Accrued and other liabilities Accrued and other liabilities          
Forward foreign exchange contracts                          
Derivative Instruments, Gain (Loss) [Line Items]                          
Notional amount € 240,600,000 € 281,100,000   $ 1.0 ¥ 1.1 $ 27.6 ₩ 66.4 ¥ 1.1 $ 0.8 ¥ 8.5 $ 26.4 ₩ 61.8 ¥ 1.1
Forward foreign exchange contracts | Cash flow hedges                          
Derivative Instruments, Gain (Loss) [Line Items]                          
Derivative asset, statement of financial position [extensible enumeration] Other assets, Other non-current assets      Other assets, Other non-current assets  Other assets, Other non-current assets  Other assets, Other non-current assets  Other assets, Other non-current assets  Other assets, Other non-current assets           
Derivative liability, statement of financial position [extensible enumeration] Accrued and other liabilities, Accrued and other liabilities     Accrued and other liabilities, Accrued and other liabilities Accrued and other liabilities, Accrued and other liabilities Accrued and other liabilities, Accrued and other liabilities Accrued and other liabilities, Accrued and other liabilities Accrued and other liabilities, Accrued and other liabilities          
Forward foreign exchange contracts | Other hedges                          
Derivative Instruments, Gain (Loss) [Line Items]                          
Derivative asset, statement of financial position [extensible enumeration] Other assets, Other non-current assets      Other assets, Other non-current assets  Other assets, Other non-current assets  Other assets, Other non-current assets  Other assets, Other non-current assets  Other assets, Other non-current assets           
Derivative liability, statement of financial position [extensible enumeration] Accrued and other liabilities, Accrued and other liabilities     Accrued and other liabilities, Accrued and other liabilities Accrued and other liabilities, Accrued and other liabilities Accrued and other liabilities, Accrued and other liabilities Accrued and other liabilities, Accrued and other liabilities Accrued and other liabilities, Accrued and other liabilities