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Derivative Financial Instruments and Risk Management Policies - Details about Hedged Items by Fair Value Hedges (Details) - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about hedged items [line items]    
Total assets € 100,502 € 104,324
Financial assets and other non-current assets 7,403 7,268
Receivables and other current assets 10,445 10,132
Other current financial assets 1,800 1,078
Non-current financial liabilities 33,192 33,360
Payables and other non-current liabilities 3,693 3,605
Current financial liabilities 5,590 3,701
Payables and other current liabilities 14,606 13,957
Designated as hedging instrument    
Disclosure of detailed information about hedged items [line items]    
Total assets 314 281
Financial assets and other non-current assets 68 124
Receivables and other current assets 225 150
Other current financial assets   4
Other heading of assets 21 3
Total allocated liabilities 12,103 10,952
Non-current financial liabilities 11,085 9,858
Payables and other non-current liabilities 50 44
Current financial liabilities 263 191
Payables and other current liabilities 705 859
Designated as hedging instrument | Fair value hedges    
Disclosure of detailed information about hedged items [line items]    
Total assets 16 (15)
Financial assets and other non-current assets 15 (14)
Receivables and other current assets 1 0
Other current financial assets   (1)
Other heading of assets 0 0
Designated as hedging instrument | Fair value hedges | Derivative instruments, including netting adjustments    
Disclosure of detailed information about hedged items [line items]    
Total allocated liabilities (35) 179
Non-current financial liabilities (50) 187
Payables and other non-current liabilities 1 (1)
Current financial liabilities 0 0
Payables and other current liabilities 14 (7)
Designated as hedging instrument | Interest rate risk    
Disclosure of detailed information about hedged items [line items]    
Total assets 55 32
Financial assets and other non-current assets 55 28
Receivables and other current assets 0 0
Other current financial assets   4
Other heading of assets 0 0
Total allocated liabilities 9,195 8,092
Non-current financial liabilities 9,083 8,009
Payables and other non-current liabilities 0 0
Current financial liabilities 112 83
Payables and other current liabilities 0 0
Designated as hedging instrument | Interest rate risk | Fair value hedges    
Disclosure of detailed information about hedged items [line items]    
Total assets 15 (15)
Financial assets and other non-current assets 15 (14)
Receivables and other current assets 0 0
Other current financial assets   (1)
Other heading of assets 0 0
Designated as hedging instrument | Interest rate risk | Fair value hedges | Derivative instruments, including netting adjustments    
Disclosure of detailed information about hedged items [line items]    
Total allocated liabilities (89) 153
Non-current financial liabilities (89) 153
Payables and other non-current liabilities 0 0
Current financial liabilities 0 0
Payables and other current liabilities 0 0
Designated as hedging instrument | Exchange rate risk    
Disclosure of detailed information about hedged items [line items]    
Total assets 259 249
Financial assets and other non-current assets 13 96
Receivables and other current assets 225 150
Other current financial assets   0
Other heading of assets 21 3
Total allocated liabilities 1,314 1,365
Non-current financial liabilities 548 452
Payables and other non-current liabilities 50 44
Current financial liabilities 11 10
Payables and other current liabilities 705 859
Designated as hedging instrument | Exchange rate risk | Fair value hedges    
Disclosure of detailed information about hedged items [line items]    
Total assets 1 0
Financial assets and other non-current assets 0 0
Receivables and other current assets 1 0
Other current financial assets   0
Other heading of assets 0 0
Designated as hedging instrument | Exchange rate risk | Fair value hedges | Derivative instruments, including netting adjustments    
Disclosure of detailed information about hedged items [line items]    
Total allocated liabilities 15 (8)
Non-current financial liabilities 0 0
Payables and other non-current liabilities 1 (1)
Current financial liabilities 0 0
Payables and other current liabilities 14 (7)
Designated as hedging instrument | Interest rate and exchange rate risk    
Disclosure of detailed information about hedged items [line items]    
Total assets 0 0
Financial assets and other non-current assets 0 0
Receivables and other current assets 0 0
Other current financial assets   0
Other heading of assets 0 0
Total allocated liabilities 1,594 1,495
Non-current financial liabilities 1,454 1,397
Payables and other non-current liabilities 0 0
Current financial liabilities 140 98
Payables and other current liabilities 0 0
Designated as hedging instrument | Interest rate and exchange rate risk | Fair value hedges    
Disclosure of detailed information about hedged items [line items]    
Total assets 0 0
Financial assets and other non-current assets 0 0
Receivables and other current assets 0 0
Other current financial assets   0
Other heading of assets 0 0
Designated as hedging instrument | Interest rate and exchange rate risk | Fair value hedges | Derivative instruments, including netting adjustments    
Disclosure of detailed information about hedged items [line items]    
Total allocated liabilities 39 34
Non-current financial liabilities 39 34
Payables and other non-current liabilities 0 0
Current financial liabilities 0 0
Payables and other current liabilities 0 0
Of which: accumulated amount of any hedge item that have ceased to be adjusted for gains and losses | Designated as hedging instrument | Fair value hedges    
Disclosure of detailed information about hedged items [line items]    
Total assets 0 0
Financial assets and other non-current assets 0 0
Receivables and other current assets 0 0
Other current financial assets   0
Other heading of assets 0 0
Of which: accumulated amount of any hedge item that have ceased to be adjusted for gains and losses | Designated as hedging instrument | Fair value hedges | Derivative instruments, including netting adjustments    
Disclosure of detailed information about hedged items [line items]    
Total allocated liabilities 37 (9)
Non-current financial liabilities 31 33
Payables and other non-current liabilities 0 0
Current financial liabilities 0 0
Payables and other current liabilities € 6 € (42)