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Equity - Cash Flow Disclosures (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Entity Information [Line Items]      
Net cash flow provided by operating activities € 11,763 € 10,268 € 13,196
Net cash flow used in investing activities (5,327) 5,896 (7,790)
Net cash flow used in financing activities (7,925) (12,990) (5,438)
Net increase (decrease) in cash and cash equivalents during the year (1,335) 2,976 (438)
Telefónica Brazil      
Entity Information [Line Items]      
Net cash flow provided by operating activities 3,678 2,949 3,517
Net cash flow used in investing activities (2,741) (1,295) (1,238)
Net cash flow used in financing activities (1,674) (1,467) (1,817)
Net increase (decrease) in cash and cash equivalents during the year (737) 187 462
Telefónica Germany      
Entity Information [Line Items]      
Net cash flow provided by operating activities 2,732 2,407 2,386
Net cash flow used in investing activities (1,608) (875) (459)
Net cash flow used in financing activities (1,339) (1,820) (1,342)
Net increase (decrease) in cash and cash equivalents during the year (215) (288) 585
Colombia Telecomunicaciones S.A. E.S.P.      
Entity Information [Line Items]      
Net cash flow provided by operating activities 180 344 276
Net cash flow used in investing activities 30 (153) (189)
Net cash flow used in financing activities (225) (218) (42)
Net increase (decrease) in cash and cash equivalents during the year (15) (27) 45
Telxius Telecom, S.A.      
Entity Information [Line Items]      
Net cash flow provided by operating activities 152 (627) 528
Net cash flow used in investing activities (63) 6,874 (1,141)
Net cash flow used in financing activities (89) (6,164) 575
Net increase (decrease) in cash and cash equivalents during the year € 0 € 83 € (38)