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Financial risk management - Narrative (Detail)
₩ in Billions, ¥ in Billions, ¥ in Billions, $ in Billions, $ in Billions
 12 Months Ended
Dec. 31, 2023
EUR (€)
eurobond
Dec. 31, 2022
EUR (€)
Dec. 31, 2021
EUR (€)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
JPY (¥)
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
KRW (₩)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2022
JPY (¥)
Dec. 31, 2022
TWD ($)
Dec. 31, 2022
KRW (₩)
Dec. 31, 2022
CNY (¥)
Derivative Instruments, Gain (Loss) [Line Items]                          
Net gain (loss) from effective cash flow hedges € (600,000) € 66,500,000 € (22,200,000)                    
Gain (loss) from derivative financial instruments measured at fair value (52,400,000) 3,600,000 (7,900,000)                    
Accumulated other comprehensive income, gain (loss) on financial instruments, net of taxes € (7,600,000) 7,600,000 16,500,000                    
Derivative instruments release period 12 months                        
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                        
Supplier finance program, obligation € 400,000,000 400,000,000                      
Supplier Finance Program, Obligation, Statement of Financial Position [Extensible Enumeration] Accounts payable     Accounts payable Accounts payable Accounts payable Accounts payable Accounts payable          
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, 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          
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          
Number of eurobonds outstanding | eurobond 6                        
Fair value assets (liabilities) transfers between levels amount € 0 0                      
Goodwill and intangible asset, impairment € 0 0                      
Designated as Hedging Instrument                          
Derivative Instruments, Gain (Loss) [Line Items]                          
Number of eurobonds outstanding | eurobond 4                        
Principal amount € 3,250,000,000                        
Not Designated as Hedging Instrument                          
Derivative Instruments, Gain (Loss) [Line Items]                          
Number of eurobonds outstanding | eurobond 2                        
Principal amount € 1,500,000,000                        
Cost of Sales                          
Derivative Instruments, Gain (Loss) [Line Items]                          
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from cash flow hedge effect, before tax (8,900,000) 5,500,000 20,800,000                    
Accumulated other comprehensive income, gain (loss) on financial instruments, net of taxes (7,600,000) 4,700,000 17,700,000                    
Sales                          
Derivative Instruments, Gain (Loss) [Line Items]                          
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from cash flow hedge effect, before tax 0 3,400,000 (1,200,000)                    
Accumulated other comprehensive income, gain (loss) on financial instruments, net of taxes 0 2,900,000 € (1,000,000)                    
Forward foreign exchange contracts                          
Derivative Instruments, Gain (Loss) [Line Items]                          
Notional principal amounts € 281,100,000 158,500,000   $ 0.8 ¥ 8.5 $ 26.4 ₩ 61.8 ¥ 1.1 $ 1.0 ¥ 43.9 $ 18.5 ₩ 99.0 ¥ 1.0
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          
Interest rate swaps                          
Derivative Instruments, Gain (Loss) [Line Items]                          
Notional principal amounts € 3,250,000,000 € 3,000,000,000                      
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