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Treasury risk management - Summary of Derivatives Used to Hedge (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about hedges [line items]    
Current financial assets € 5,890 € 5,761
Non-Current financial assets 1,386 1,154
Trade payables and other liabilities (16,995) (18,293)
Current financial liabilities (5,087) (5,775)
Non-current financial liabilities (24,535) (23,713)
Derivative used to hedge    
Disclosure of detailed information about hedges [line items]    
Trade and other receivables 37 89
Current financial assets 37 238
Non-Current financial assets 75 51
Total assets 149 378
Trade payables and other liabilities (65) (153)
Current financial liabilities (48) (102)
Non-current financial liabilities (446) (529)
Total liabilities (559) (784)
Total (410) (406)
Fair value hedges | Foreign exchange derivatives | Derivative used to hedge    
Disclosure of detailed information about hedges [line items]    
Trade and other receivables 0 0
Current financial assets 0 0
Non-Current financial assets 0 0
Trade payables and other liabilities 0 0
Current financial liabilities 0 0
Non-current financial liabilities 0 0
Total 0 0
Fair value hedges | Interest rate derivatives | Derivative used to hedge    
Disclosure of detailed information about hedges [line items]    
Trade and other receivables 0 0
Current financial assets 0 0
Non-Current financial assets 0 0
Trade payables and other liabilities 0 0
Current financial liabilities 0 0
Non-current financial liabilities (425) (522)
Total (425) (522)
Cash flow hedges | Foreign exchange derivatives | Derivative used to hedge    
Disclosure of detailed information about hedges [line items]    
Trade and other receivables 22 32
Current financial assets 0 0
Non-Current financial assets 0 0
Trade payables and other liabilities (28) (80)
Current financial liabilities 0 0
Non-current financial liabilities 0 0
Total (6) (48)
Cash flow hedges | Interest rate derivatives | Derivative used to hedge    
Disclosure of detailed information about hedges [line items]    
Trade and other receivables 0 0
Current financial assets 0 75
Non-Current financial assets 75 51
Trade payables and other liabilities 0 0
Current financial liabilities (6) 0
Non-current financial liabilities (21) (7)
Total 48 119
Cash flow hedges | Commodity contracts | Derivative used to hedge    
Disclosure of detailed information about hedges [line items]    
Trade and other receivables 8 6
Current financial assets 0 0
Non-Current financial assets 0 0
Trade payables and other liabilities (22) (38)
Current financial liabilities 0 0
Non-current financial liabilities 0 0
Total (14) (32)
Hedges on the net investment in foreign operations | Foreign exchange derivatives | Derivative used to hedge    
Disclosure of detailed information about hedges [line items]    
Trade and other receivables 0 0
Current financial assets 0 0
Non-Current financial assets 0 0
Trade payables and other liabilities 0 0
Current financial liabilities (42) (92)
Non-current financial liabilities 0 0
Total (42) (92)
Hedge accounting not applied | Foreign exchange derivatives | Derivative used to hedge    
Disclosure of detailed information about hedges [line items]    
Trade and other receivables 7 51
Current financial assets 37 163
Non-Current financial assets 0 0
Trade payables and other liabilities (15) (35)
Current financial liabilities 0 (10)
Non-current financial liabilities 0 0
Total 29 169
Hedge accounting not applied | Interest rate derivatives | Derivative used to hedge    
Disclosure of detailed information about hedges [line items]    
Trade and other receivables 0 0
Current financial assets 0 0
Non-Current financial assets 0 0
Trade payables and other liabilities 0 0
Current financial liabilities 0 0
Non-current financial liabilities 0 0
Total 0 0
Hedge accounting not applied | Commodity contracts | Derivative used to hedge    
Disclosure of detailed information about hedges [line items]    
Trade and other receivables 0 0
Current financial assets 0 0
Non-Current financial assets 0 0
Trade payables and other liabilities 0 0
Current financial liabilities 0 0
Non-current financial liabilities 0 0
Total € 0 € 0