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Breakdown of Contractual Assets and Liabilities, and Capitalized Costs - Movement In Contract Liabilities (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Contract Assets And Liabilities [Line Items]    
Contract liabilities, beginning balance € 1,813 € 1,929
Additions 5,874 5,536
Disposals (previous years) (970) (975)
Disposals (current year) (4,809) (4,701)
Transfers (2) 7
Translation differences and inflation adjustments (29) 17
Contract liabilities, ending balance 1,877 1,813
Long-term contracts    
Contract Assets And Liabilities [Line Items]    
Contract liabilities, beginning balance 778 891
Additions 250 162
Disposals (previous years) (1) (2)
Disposals (current year) 0 (1)
Transfers (222) (279)
Translation differences and inflation adjustments 8 7
Contract liabilities, ending balance 813 778
Short-term contracts    
Contract Assets And Liabilities [Line Items]    
Contract liabilities, beginning balance 1,035 1,038
Additions 5,624 5,374
Disposals (previous years) (969) (973)
Disposals (current year) (4,809) (4,700)
Transfers 220 286
Translation differences and inflation adjustments (37) 10
Contract liabilities, ending balance € 1,064 € 1,035