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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2024
Intangible Assets [Abstract]  
Schedule of Goodwill by Group Segment
The cost, accumulated amortization and impairment losses of intangible assets at December 31, 2024 and 2023 are as follows:
Balance at December 31, 2024
Millions of eurosCostAccumulated amortizationImpairment lossesIntangible assets
Service concession arrangements and licenses15,018 (8,666)(685)5,667 
Software18,442 (15,300)(38)3,104 
Customer base2,265 (2,114)— 151 
Trademarks905 (718)— 187 
Other intangible assets794 (726)(4)64 
Intangible assets in process702 — — 702 
Total intangible assets38,126 (27,524)(727)9,875 
Balance at December 31, 2023
Millions of eurosCostAccumulated amortizationImpairment lossesIntangible assets
Service concession arrangements and licenses16,056 (9,061)(109)6,886 
Software17,851 (14,753)(9)3,089 
Customer base4,166 (3,780)— 386 
Trademarks958 (723)— 235 
Other intangible assets867 (805)(4)58 
Intangible assets in process724 — (8)716 
Total intangible assets40,622 (29,122)(130)11,370 
The movement in goodwill assigned to each Group segment was as follows:
2024
Millions of eurosBalance at 12/31/2023AdditionsDisposalsWrite-offsTransfersExchange rate impactBalance at 12/31/2024
Telefónica Spain4,291 — — — — — 4,291 
Telefónica Brazil8,076 28 — — — (1,364)6,740 
Telefónica Germany4,386 — — — — — 4,386 
Telefónica Hispam1,108 — (16)(623)— (51)418 
Others847 — — (243)— 22 626 
Total18,708 28 (16)(866)— (1,393)16,461 
2023
Millions of eurosBalance at 12/31/2022AdditionsDisposalsWrite-offsTransfersExchange rate impactBalance at 12/31/2023
Telefónica Spain4,291 — — — — — 4,291 
Telefónica Brazil7,752 5 — — — 319 8,076 
Telefónica Germany4,386 — — — — — 4,386 
Telefónica Hispam1,215 — — (58)(36)(13)1,108 
Others827 11 — — — 9 847 
Total18,471 16 — (58)(36)315 18,708 
Schedule of Allocation of Goodwill to the Different Cash-Generating Units (CGUs)
In order to test for impairment, goodwill was allocated to the different cash-generating units (CGUs), which are grouped into the following reportable operating segments:
 Millions of euros12/31/202412/31/2023
Telefónica Spain4,291 4,291 
Telefónica Brazil6,740 8,076 
Telefónica Germany4,386 4,386 
Telefónica Hispam418 1,108 
Colombia136 164 
Ecuador79 75 
Chile179 615 
Peru— 229 
Uruguay22 23 
Others T. Hispam2 2 
Other companies626 847 
Telefónica Tech UK & Ireland268 438 
BE-terna230 282 
Others128 127 
TOTAL16,461 18,708 
The discount rates applied to the cash flow projections in 2024 and 2023 for the main CGUs are as follows:
20242023
Discount rate in local currencyBefore taxAfter-taxBefore taxAfter-tax
Spain8.6%6.6%9.1%7.0%
Brazil13.9%11.5%14.8%12.0%
Germany8.0%5.5%8.4%5.8%
The perpetuity growth rates applied to the cash flow projections in 2024 and 2023 for the main CGUs are as follows:
Perpetuity growth rate
in local currency 		20242023
Spain0.8%0.8%
Brazil4.0%4.0%
Germany1.0%1.0%
Schedule of Sensitivity to Changes in Assumptions
The Group performs a sensitivity analysis of the impairment test by considering reasonable changes in the main assumptions used in the test. For the main CGU, the following maximum increases or decreases were assumed, expressed in percentage points:
Changes in key assumptions,
In percentage points		SpainGermanyBrazil
Financial variables  
Discount rate
 +/-0.5
 +/-0.5
 +/-1
Perpetuity growth rates
 +/-0.25
 +/-0.25
 +/-0.5
Long-term operating variables
Long-term margin of operating results before depreciation and amortization
 +/-1.75
 +/-1.5
 +/-2
Ratio of CapEx/Revenues
 +/-0.875
 +/-0.75
 +/-1