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Business Combinations, Acquisitions, Sale and Non-controlling Interest - Summary of Consolidated Statements of Comprehensive Income (Detail)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2019
MXN ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Disclosure of detailed information about business combination [line items]        
Operating costs and expenses $ 852,507,334 $ 45,237 $ 898,650,510 $ 921,490,232
Operating income 154,840,535 8,217 139,557,171 100,143,303
Net income 70,313,455 3,731 54,516,823 32,155,333
Total comprehensive income 6,124,939 325 (12,805,619) 7,434,083
Distribution of the net profit (loss) to:        
Equity holders of the parent 67,730,891 3,594 52,566,197 29,325,921
Non-controllinginterest 2,582,564 137 1,950,626 2,829,412
Net income 70,313,455 3,731 54,516,823 32,155,333
Comprehensive income (loss) for the year attributable to:        
Equity holders of the parent 5,450,679 289 (11,770,227) 1,201,698
Non-controllinginterest 674,260 36 (1,035,392) 6,232,385
Total comprehensive income (loss) for the year 6,124,939 $ 325 (12,805,619) 7,434,083
Subsidiaries with material non-controlling interests [member]        
Disclosure of detailed information about business combination [line items]        
Operating revenues 98,420,289   100,716,444 93,644,173
Operating costs and expenses 89,732,428   95,984,880 86,920,692
Operating income 8,687,861   4,731,564 6,723,481
Net income 5,051,145   3,809,694 5,656,132
Total comprehensive income 1,466,783   5,047,838 7,737,797
Distribution of the net profit (loss) to:        
Equity holders of the parent 2,565,733   1,942,944 2,884,627
Non-controllinginterest 2,485,412   1,866,750 2,771,505
Net income 5,051,145   3,809,694 5,656,132
Comprehensive income (loss) for the year attributable to:        
Equity holders of the parent 748,059   2,574,397 3,978,263
Non-controllinginterest 718,724   2,473,441 3,759,534
Total comprehensive income (loss) for the year $ 1,466,783   $ 5,047,838 $ 7,737,797