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Investments in Associates and Joint Ventures - Roll forward (Details)
$ in Thousands, $ in Millions
3 Months Ended 12 Months Ended
Jan. 01, 2020
MXN ($)
Mar. 31, 2020
MXN ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2021
MXN ($)
Dec. 31, 2020
MXN ($)
Disclosure of Associate and Joint Ventures [Line Items]          
At January 1 $ 9,762,432 $ 9,762,432   $ 22,813,531 $ 9,762,432
Impairment loss in investment in shares of UHI         (5,455,356)
Reverse impairment losses       4,161,704  
Share of (loss) or income of associates and joint ventures, net       (489,827) (284,312)
Other Comprehensive Income (loss)       245,714 (61,033)
Foreign currency translation adjustments       505,183 1,360,735
Disposition of OCEN       (503,872)  
Dividends from PDS       (10,000)  
Investment in Flayacross       43,855  
Other       51,098 68,511
At December 31       26,704,235 22,813,531
Grupo de Telecomunicaciones de Alta Capacidad, S.A.P.I. de C.V. and subsidiaries ("GTAC")          
Disclosure of Associate and Joint Ventures [Line Items]          
At January 1       514,731  
Long-term loans granted to GTAC, net       131,604 132,926
Payment of principal and interest       (244,755) (246,046)
At December 31       614,147 514,731
UH II          
Disclosure of Associate and Joint Ventures [Line Items]          
Impairment loss in investment in shares of UHI   $ (5,455,356) $ (228.6)   (5,455,356)
Exercise of warrants for UHI shares         17,387,699
OCEN and subsidiaries          
Disclosure of Associate and Joint Ventures [Line Items]          
At January 1       556,251  
Additional share of income of OCEN $ 147,975     $ 147,975 147,975
At December 31         $ 556,251