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Treasury risk management - Summary of Derivatives Used to Hedge (Details) - EUR (€)
€ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about hedges [line items]    
Current financial assets € 5,761 € 4,571
Non-Current financial assets 1,154 1,198
Trade payables and other liabilities (18,293) (15,136)
Current financial liabilities (5,775) (7,252)
Non-current financial liabilities (23,713) (22,881)
Derivative used to hedge    
Disclosure of detailed information about hedges [line items]    
Trade and other receivables 89 161
Current financial assets 238 76
Non-Current financial assets 51 52
Total assets 378 289
Trade payables and other liabilities (153) (51)
Current financial liabilities (102) (85)
Non-current financial liabilities (529) (99)
Total liabilities (784) (235)
Total (406) 54
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 (522) (39)
Total (522) (39)
Cash flow hedges | Foreign exchange derivatives | Derivative used to hedge    
Disclosure of detailed information about hedges [line items]    
Trade and other receivables 32 100
Current financial assets 0 0
Non-Current financial assets 0 0
Trade payables and other liabilities (80) (33)
Current financial liabilities 0 0
Non-current financial liabilities 0 0
Total (48) 67
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 75 11
Non-Current financial assets 51 52
Trade payables and other liabilities 0 0
Current financial liabilities 0 (24)
Non-current financial liabilities (7) (58)
Total 119 (19)
Cash flow hedges | Commodity contracts | Derivative used to hedge    
Disclosure of detailed information about hedges [line items]    
Trade and other receivables 6 45
Current financial assets 0 0
Non-Current financial assets 0 0
Trade payables and other liabilities (38) (1)
Current financial liabilities 0 0
Non-current financial liabilities 0 0
Total (32) 44
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 0 112
Non-Current financial assets 0 0
Trade payables and other liabilities 0 0
Current financial liabilities (92) 0
Non-current financial liabilities 0 0
Total (92) 112
Hedge accounting not applied | Foreign exchange derivatives | Derivative used to hedge    
Disclosure of detailed information about hedges [line items]    
Trade and other receivables 51 16
Current financial assets 163 (47)
Non-Current financial assets 0 0
Trade payables and other liabilities (35) (17)
Current financial liabilities (10) (61)
Non-current financial liabilities 0 (2)
Total 169 (111)
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