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Income Taxes - Rollforward of deferred income tax assets and liabilities (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Rollforward of deferred income tax assets and liabilities    
Deferred income tax account at beginning of period $ 17,132,915 $ 13,791,257
Credit (Charge) to Consolidated Statement of Income 1,574,610 2,598,712
Credit (Charge) to Other Comprehensive Income and Equity 7,528,693 811,677
Disposed Operations (22,836) (68,731)
Reclassification to current assets (liabilities) held for sale   (68,731)
Deferred income tax account at end of period 26,213,382 17,132,915
Assets    
Rollforward of deferred income tax assets and liabilities    
Credit (Charge) to Consolidated Statement of Income 0  
Accrued liabilities    
Rollforward of deferred income tax assets and liabilities    
Deferred income tax account at beginning of period 4,352,021 3,619,288
Credit (Charge) to Consolidated Statement of Income 1,867,291 732,733
Deferred income tax account at end of period 6,219,312 4,352,021
Loss allowance    
Rollforward of deferred income tax assets and liabilities    
Deferred income tax account at beginning of period 1,550,482 1,344,425
Credit (Charge) to Consolidated Statement of Income (314,824) 206,057
Deferred income tax account at end of period 1,235,658 1,550,482
Customer advances    
Rollforward of deferred income tax assets and liabilities    
Deferred income tax account at beginning of period 1,499,462 1,799,330
Credit (Charge) to Consolidated Statement of Income 100,872 (299,868)
Deferred income tax account at end of period 1,600,334 1,499,462
Derivative financial instruments    
Rollforward of deferred income tax assets and liabilities    
Deferred income tax account at beginning of period 273,210  
Credit (Charge) to Consolidated Statement of Income 288,737 (183,364)
Credit (Charge) to Other Comprehensive Income and Equity 411,044 456,574
Deferred income tax account at end of period 972,991 273,210
Property, plant and equipment, net    
Rollforward of deferred income tax assets and liabilities    
Deferred income tax account at beginning of period 1,650,860 1,570,890
Credit (Charge) to Consolidated Statement of Income 433,690 79,970
Deferred income tax account at end of period 2,084,550 1,650,860
Prepaid expenses and other items    
Rollforward of deferred income tax assets and liabilities    
Deferred income tax account at beginning of period 3,700,673 1,125,387
Credit (Charge) to Consolidated Statement of Income 2,087,586 2,586,763
Credit (Charge) to Other Comprehensive Income and Equity 103,294 57,254
Disposed Operations (22,836)  
Reclassification to current assets (liabilities) held for sale   (68,731)
Deferred income tax account at end of period 5,868,717 3,700,673
Tax loss carryforwards    
Rollforward of deferred income tax assets and liabilities    
Deferred income tax account at beginning of period 13,025,006 13,015,397
Credit (Charge) to Consolidated Statement of Income (1,516,219) 334,122
Credit (Charge) to Other Comprehensive Income and Equity (259,202) (324,513)
Deferred income tax account at end of period 11,249,585 13,025,006
Deferred income tax assets of foreign subsidiaries    
Rollforward of deferred income tax assets and liabilities    
Deferred income tax account at beginning of period 163,747 221,392
Credit (Charge) to Consolidated Statement of Income 98,182 (57,645)
Deferred income tax account at end of period 261,929 163,747
Investments    
Rollforward of deferred income tax assets and liabilities    
Deferred income tax account at beginning of period (6,676,401) (7,812,896)
Credit (Charge) to Consolidated Statement of Income (1,327,066) 514,133
Credit (Charge) to Other Comprehensive Income and Equity 7,273,557 622,362
Deferred income tax account at end of period (729,910) (6,676,401)
Derivative financial instruments    
Rollforward of deferred income tax assets and liabilities    
Deferred income tax account at beginning of period   (248,547)
Credit (Charge) to Consolidated Statement of Income 0 248,547
Intangible assets and transmission rights    
Rollforward of deferred income tax assets and liabilities    
Deferred income tax account at beginning of period (2,406,145) (843,409)
Credit (Charge) to Consolidated Statement of Income (143,639) (1,562,736)
Deferred income tax account at end of period $ (2,549,784) $ (2,406,145)