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Breakdown of Contractual Assets and Liabilities, and Capitalized Costs - Movement in Contract Assets (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Contract assets [abstract]    
Contract assets, beginning balance € 527 € 554
Additions 430 394
Disposals (436) (420)
Transfers 0 (1)
Contract assets, ending balance 517 527
Long-term contracts    
Contract assets [abstract]    
Contract assets, beginning balance 325 359
Additions 162 118
Disposals (10) (17)
Transfers (189) (135)
Contract assets, ending balance 288 325
Long-term contracts | Cost    
Contract assets [abstract]    
Contract assets, beginning balance 326 360
Additions 162 118
Disposals (10) (17)
Transfers (189) (135)
Contract assets, ending balance 289 326
Long-term contracts | Impairment losses    
Contract assets [abstract]    
Contract assets, beginning balance (1) (1)
Additions 0 0
Disposals 0 0
Transfers 0 0
Contract assets, ending balance (1) (1)
Short-term contracts    
Contract assets [abstract]    
Contract assets, beginning balance 202 195
Additions 268 276
Disposals (426) (403)
Transfers 189 134
Contract assets, ending balance 229 202
Short-term contracts | Cost    
Contract assets [abstract]    
Contract assets, beginning balance 209 202
Additions 270 277
Disposals (426) (404)
Transfers 188 134
Contract assets, ending balance 236 209
Short-term contracts | Impairment losses    
Contract assets [abstract]    
Contract assets, beginning balance (7) (7)
Additions (2) (1)
Disposals 0 1
Transfers 1 0
Contract assets, ending balance € (7) € (7)