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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, 2023
Dec. 31, 2022
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]    
Capitalized costs, beginning balance € 1,739 € 1,223
Additions 1,458 1,450
Disposals (1,177) (989)
Transfers 2 0
Translation differences and hyperinflation adjustments (23) 39
Other movements   16
Capitalized costs, ending balance 1,999 1,739
Long-term contracts    
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]    
Capitalized costs, beginning balance 854 555
Additions 838 820
Disposals (2) (2)
Transfers (682) (547)
Translation differences and hyperinflation adjustments (7) 19
Other movements   9
Capitalized costs, ending balance 1,001 854
Short-term contracts    
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]    
Capitalized costs, beginning balance 885 668
Additions 620 630
Disposals (1,175) (987)
Transfers 684 547
Translation differences and hyperinflation adjustments (16) 20
Other movements   7
Capitalized costs, ending balance 998 885
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 hyperinflation adjustments 0 0
Other movements   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 hyperinflation adjustments 0 0
Other movements   0
Capitalized costs, ending balance 0 0
Of obtaining a contract | Gross cost | Long-term contracts    
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]    
Capitalized costs, beginning balance 610 371
Additions 694 671
Disposals (1) 0
Transfers (536) (447)
Translation differences and hyperinflation adjustments 7 6
Other movements   9
Capitalized costs, ending balance 774 610
Of obtaining a contract | Gross cost | Short-term contracts    
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]    
Capitalized costs, beginning balance 710 537
Additions 534 509
Disposals (967) (801)
Transfers 538 448
Translation differences and hyperinflation adjustments 0 10
Other movements   7
Capitalized costs, ending balance 815 710
Of fulfilling a contract | Gross cost | Long-term contracts    
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]    
Capitalized costs, beginning balance 244 184
Additions 144 149
Disposals (1) (2)
Transfers (146) (100)
Translation differences and hyperinflation adjustments (14) 13
Other movements   0
Capitalized costs, ending balance 227 244
Of fulfilling a contract | Gross cost | Short-term contracts    
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]    
Capitalized costs, beginning balance 175 131
Additions 86 121
Disposals (208) (186)
Transfers 146 99
Translation differences and hyperinflation adjustments (16) 10
Other movements   0
Capitalized costs, ending balance € 183 € 175