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Fair value measurement - Disclosure of assets and liabilities measured at fair value on a recurring basis (Details) - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets € 195,153 € 207,607  
Level 3 | Receivables from financing activities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 3 0 € 117
Level 3 | Other receivables      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 0 66 € 76
Recurring fair value measurement      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 15,790 22,201  
Liabilities 213 681  
Recurring fair value measurement | Derivative financial liabilities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities 36 24  
Recurring fair value measurement | Derivative operating liabilities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities 177 657  
Recurring fair value measurement | Financial securities and equity instruments measured at FVOCI      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 397 415  
Recurring fair value measurement | Financial securities and equity instruments measured at FVPL      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 1,465 1,860  
Recurring fair value measurement | Derivative financial liabilities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 304 380  
Recurring fair value measurement | Derivative operating liabilities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 406 273  
Recurring fair value measurement | Collateral deposits      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 20 53  
Recurring fair value measurement | Receivables from financing activities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   0  
Recurring fair value measurement | Other receivables      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 0 66  
Recurring fair value measurement | Money market securities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 13,191 19,127  
Recurring fair value measurement | Level 1      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 14,429 20,504  
Liabilities 0 0  
Recurring fair value measurement | Level 1 | Derivative financial liabilities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities 0 0  
Recurring fair value measurement | Level 1 | Derivative operating liabilities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities 0 0  
Recurring fair value measurement | Level 1 | Financial securities and equity instruments measured at FVOCI      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 108 119  
Recurring fair value measurement | Level 1 | Financial securities and equity instruments measured at FVPL      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 1,110 1,205  
Recurring fair value measurement | Level 1 | Derivative financial liabilities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 0 0  
Recurring fair value measurement | Level 1 | Derivative operating liabilities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 0 0  
Recurring fair value measurement | Level 1 | Collateral deposits      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 20 53  
Recurring fair value measurement | Level 1 | Receivables from financing activities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 0 0  
Recurring fair value measurement | Level 1 | Trade receivables      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 0 0  
Recurring fair value measurement | Level 1 | Other receivables      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 0 0  
Recurring fair value measurement | Level 1 | Money market securities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 13,191 19,127  
Recurring fair value measurement | Level 2      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 708 709  
Liabilities 213 680  
Recurring fair value measurement | Level 2 | Derivative financial liabilities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities 36 24  
Recurring fair value measurement | Level 2 | Derivative operating liabilities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities 177 656  
Recurring fair value measurement | Level 2 | Financial securities and equity instruments measured at FVOCI      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 0 29  
Recurring fair value measurement | Level 2 | Financial securities and equity instruments measured at FVPL      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 4 0  
Recurring fair value measurement | Level 2 | Derivative financial liabilities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 303 380  
Recurring fair value measurement | Level 2 | Derivative operating liabilities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 397 273  
Recurring fair value measurement | Level 2 | Collateral deposits      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 0 0  
Recurring fair value measurement | Level 2 | Receivables from financing activities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 0 0  
Recurring fair value measurement | Level 2 | Trade receivables      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 4 27  
Recurring fair value measurement | Level 2 | Other receivables      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 0 0  
Recurring fair value measurement | Level 2 | Money market securities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 0 0  
Recurring fair value measurement | Level 3      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 653 988  
Liabilities 0 1  
Recurring fair value measurement | Level 3 | Derivative financial liabilities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities 0 0  
Recurring fair value measurement | Level 3 | Derivative operating liabilities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities 0 1  
Recurring fair value measurement | Level 3 | Financial securities and equity instruments measured at FVOCI      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 289 267  
Recurring fair value measurement | Level 3 | Financial securities and equity instruments measured at FVPL      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 351 655  
Recurring fair value measurement | Level 3 | Derivative financial liabilities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 1 0  
Recurring fair value measurement | Level 3 | Derivative operating liabilities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 9 0  
Recurring fair value measurement | Level 3 | Collateral deposits      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 0 0  
Recurring fair value measurement | Level 3 | Receivables from financing activities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 3 0  
Recurring fair value measurement | Level 3 | Trade receivables      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 0 0  
Recurring fair value measurement | Level 3 | Other receivables      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets 0 66  
Recurring fair value measurement | Level 3 | Money market securities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets € 0 € 0