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Breakdown of Contractual Assets and Liabilities, and Capitalized Costs - Movement in Deferred Expenses (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]    
Capitalized costs, beginning balance € 1,999 € 1,739
Additions 1,556 1,458
Disposals (1,337) (1,177)
Transfers (3) 2
Translation differences and inflation adjustments (48) (23)
Capitalized costs, ending balance 2,167 1,999
Long-term contracts    
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]    
Capitalized costs, beginning balance 1,001 854
Additions 885 838
Disposals (5) (2)
Transfers (764) (682)
Translation differences and inflation adjustments (44) (7)
Capitalized costs, ending balance 1,073 1,001
Short-term contracts    
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]    
Capitalized costs, beginning balance 998 885
Additions 671 620
Disposals (1,332) (1,175)
Transfers 761 684
Translation differences and inflation adjustments (4) (16)
Capitalized costs, ending balance 1,094 998
Impairment losses | Long-term contracts    
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]    
Capitalized costs, beginning balance 0 0
Additions 0 0
Disposals 0 0
Transfers 0 0
Translation differences and inflation adjustments 0 0
Capitalized costs, ending balance 0 0
Impairment losses | Short-term contracts    
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]    
Capitalized costs, beginning balance 0 0
Additions 0 0
Disposals 0 0
Transfers 0 0
Translation differences and inflation adjustments 0 0
Capitalized costs, ending balance 0 0
Of obtaining a contract | Cost | Long-term contracts    
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]    
Capitalized costs, beginning balance 774 610
Additions 759 694
Disposals (5) (1)
Transfers (601) (536)
Translation differences and inflation adjustments (56) 7
Capitalized costs, ending balance 871 774
Of obtaining a contract | Cost | Short-term contracts    
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]    
Capitalized costs, beginning balance 815 710
Additions 573 534
Disposals (1,077) (967)
Transfers 599 538
Translation differences and inflation adjustments (21) 0
Capitalized costs, ending balance 889 815
Of fulfilling a contract | Cost | Long-term contracts    
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]    
Capitalized costs, beginning balance 227 244
Additions 126 144
Disposals 0 (1)
Transfers (163) (146)
Translation differences and inflation adjustments 12 (14)
Capitalized costs, ending balance 202 227
Of fulfilling a contract | Cost | Short-term contracts    
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]    
Capitalized costs, beginning balance 183 175
Additions 98 86
Disposals (255) (208)
Transfers 162 146
Translation differences and inflation adjustments 17 (16)
Capitalized costs, ending balance € 205 € 183