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Debt - Summary of Short- and Long-Term Debt (Detail)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2020
USD ($)
Disclosure of detailed information about borrowings [line items]      
Borrowings $ 628,382,956 $ 624,254,477  
Less: Short-term debt and current portion of long-term debt 148,083,184 129,172,033 $ 7,423
Long-term debt $ 480,299,772 495,082,444 $ 24,077
Hybrid Notes [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings maturity 2073    
Borrowings $ 13,403,133 25,362,813  
Lines of credit [member]      
Disclosure of detailed information about borrowings [line items]      
Less: Short-term debt and current portion of long-term debt 53,062,260 40,722,004  
Finance Lease [member]      
Disclosure of detailed information about borrowings [line items]      
Less: Short-term debt and current portion of long-term debt 13,910 11,743  
Line of credit and others [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings 53,119,526 53,699,481  
U.S. dollars [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings $ 186,531,417 $ 169,142,643  
U.S. dollars [member] | Fixed-rate Senior notes interest rate 5.000% maturing 2020 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate   5.00%  
Borrowings maturity   2020  
Borrowings   $ 11,774,764  
U.S. dollars [member] | Fixed-rate Senior notes interest rate 3.125% maturing 2022 [Member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 3.125% 3.125% 3.125%
Borrowings maturity 2022 2022  
Borrowings $ 31,917,920 $ 30,152,320  
U.S. dollars [member] | Fixed-rate Senior notes interest rate 3.625% maturing 2029 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 3.625% 3.625% 3.625%
Borrowings maturity 2029 2029  
Borrowings $ 19,948,700 $ 18,845,200  
U.S. dollars [member] | Fixed-rate Senior notes interest rate 6.375% maturing 2035 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 6.375% 6.375% 6.375%
Borrowings maturity 2035 2035  
Borrowings $ 19,576,258 $ 18,493,360  
U.S. dollars [member] | Fixed-rate Senior notes interest rate 6.125% maturing 2037 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 6.125% 6.125% 6.125%
Borrowings maturity 2040 2037  
Borrowings $ 39,897,400 $ 6,958,119  
U.S. dollars [member] | Fixed-rate Senior notes interest rate 6.125% maturing 2040 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 6.125% 6.125% 6.125%
Borrowings maturity 2037 2040  
Borrowings $ 7,365,559 $ 37,690,400  
U.S. dollars [member] | Fixed Rate Senior Notes Interest Rate 4.375% Maturing 2042 [Member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 4.375% 4.375% 4.375%
Borrowings maturity 2042 2042  
Borrowings $ 22,941,005 $ 21,671,980  
U.S. dollars [member] | Fixed-rate Senior notes interest rate 4.375% maturing 2049 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 4.375% 4.375% 4.375%
Borrowings maturity 2049 2049  
Borrowings $ 24,935,875 $ 23,556,500  
U.S. dollars [member] | Lines of credit [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings   $ 9,359,340  
U.S. dollars [member] | Fixed-rate Senior notes interest rate 2.875% maturing 2030      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 2.875%   2.875%
Borrowings maturity 2030    
Borrowings $ 19,948,700    
U.S. dollars [member] | Bottom of range [member] | Lines of credit [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate   5.50%  
Borrowings maturity   2020  
U.S. dollars [member] | Top of range [member] | Lines of credit [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate   9.02%  
Borrowings maturity   2024  
Mexican pesos [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings $ 51,282,881 $ 58,129,292  
Mexican pesos [member] | Domestic Senior Notes Interest Rate 8.600% Maturing 2020 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate   8.60%  
Borrowings maturity   2020  
Borrowings   $ 7,000,000  
Mexican pesos [member] | Fixed Rate Senior Notes Interest Rate 6.450% Maturing 2022 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 6.45% 6.45% 6.45%
Borrowings maturity 2022 2022  
Borrowings $ 22,500,000 $ 22,500,000  
Mexican pesos [member] | Fixed Rate Senior Notes Interest Rate 7.125% Maturing 2024 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 7.125% 7.125% 7.125%
Borrowings maturity 2024 2024  
Borrowings $ 11,000,000 $ 11,000,000  
Mexican pesos [member] | Domestic Senior Notes Interest Rate 0.000% Maturing 2025 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 0.00% 0.00% 0.00%
Borrowings maturity 2025 2025  
Borrowings $ 4,911,181 $ 4,757,592  
Mexican pesos [member] | Fixed Rate Senior Notes Interest Rate 8.460% Maturing 2036 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 8.46% 8.46% 8.46%
Borrowings maturity 2036 2036  
Borrowings $ 7,871,700 $ 7,871,700  
Mexican pesos [member] | Domestic Senior Notes Interest Rate 8.360% Maturing 2037 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 8.36% 8.36% 8.36%
Borrowings maturity 2037 2037  
Borrowings $ 5,000,000 $ 5,000,000  
Mexican pesos [member] | Lines of credit [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings maturity 2021 2020  
Borrowings interest basis TIIE + 0.300% - TIIE + 1.000% TIIE + 0.050% -TIIE + 0.090%  
Borrowings $ 27,100,000 $ 22,000,000  
Euros [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings 224,928,934 222,190,375  
Euros [member] | Hybrid Notes [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings $ 13,403,133 $ 11,622,118  
Euros [member] | Commercial Paper One Interest Rate -0.230% maturing 2020 [Member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate   (0.23%)  
Borrowings maturity   2020  
Borrowings   $ 2,599,128  
Euros [member] | Exchangable bonds interest rate 0.000% maturing 2020 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate   0.00%  
Borrowings maturity   2020  
Borrowings   $ 60,051,270  
Euros [member] | Fixed rate senior notes interest rate 3.000% maturing 2021 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 3.00% 3.00% 3.00%
Borrowings maturity 2021 2021  
Borrowings $ 24,369,332 $ 21,131,123  
Euros [member] | Fixed rate senior notes interest rate 3.125% maturing 2021 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 3.125% 3.125% 3.125%
Borrowings maturity 2021 2021  
Borrowings $ 18,276,999 $ 15,848,342  
Euros [member] | Fixed rate senior notes interest rate 4.000% maturing 2022 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 4.00% 4.00% 4.00%
Borrowings maturity 2022 2022  
Borrowings $ 18,276,999 $ 15,848,342  
Euros [member] | Fixed rate senior notes interest rate 4.750% maturing 2022 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 4.75% 4.75% 4.75%
Borrowings maturity 2022 2022  
Borrowings $ 18,276,999 $ 15,848,342  
Euros [member] | Fixed rate senior notes interest rate 3.500% maturing 2023 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 3.50% 3.50% 3.50%
Borrowings maturity 2023 2023  
Borrowings $ 7,310,800 $ 6,339,337  
Euros [member] | Fixed rate senior notes interest rate 3.259% maturing 2023 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 3.259% 3.259% 3.259%
Borrowings maturity 2023 2023  
Borrowings $ 18,276,999 $ 15,848,342  
Euros [member] | Fixed rate senior notes interest rate 1.500% maturing 2024 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 1.50% 1.50% 1.50%
Borrowings maturity 2024 2024  
Borrowings $ 20,713,932 $ 17,961,454  
Euros [member] | Fixed rate senior notes interest rate 1.500% maturing 2026 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 1.50% 1.50% 1.50%
Borrowings maturity 2026 2026  
Borrowings $ 18,276,999 $ 15,848,342  
Euros [member] | Fixed rate senior notes interest rate 0.750% maturing 2027 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 0.75% 0.75% 0.75%
Borrowings maturity 2027 2027  
Borrowings $ 24,369,332 $ 21,131,123  
Euros [member] | Fixed rate senior notes interest rate 2.125% maturing 2028 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 2.125% 2.125% 2.125%
Borrowings maturity 2028 2028  
Borrowings $ 15,840,066 $ 13,735,230  
Euros [member] | Euro Nc10 series B capital securities interest rate 6.375% maturing 2073 [member] | Hybrid Notes [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 6.375% 6.375% 6.375%
Borrowings maturity 2073 2073  
Borrowings $ 13,403,133 $ 11,622,118  
Euros [member] | Lines of credit [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate   0.03%  
Borrowings maturity   2020  
Borrowings   $ 2,113,112  
Euros [member] | Commercial Paper Four Interest Rate -0.230% - -0.310% maturing 2021      
Disclosure of detailed information about borrowings [line items]      
Borrowings maturity 2021    
Borrowings $ 40,940,477    
Euros [member] | Bottom of range [member] | Commercial Paper Four Interest Rate -0.230% - -0.310% maturing 2021      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate (0.23%)   (0.23%)
Euros [member] | Top of range [member] | Commercial Paper Four Interest Rate -0.230% - -0.310% maturing 2021      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate (0.31%)   (0.31%)
Pound sterling [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings $ 59,993,720 54,962,779  
Pound sterling [member] | Hybrid Notes [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings   $ 13,740,695  
Pound sterling [member] | Fixed rate senior notes interest rate 5.000% maturing 2026 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 5.00% 5.00% 5.00%
Borrowings maturity 2026 2026  
Borrowings $ 13,634,936 $ 12,491,541  
Pound sterling [member] | Fixed rate senior notes interest rate 5.750% maturing 2030 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 5.75% 5.75% 5.75%
Borrowings maturity 2030 2030  
Borrowings $ 17,725,417 $ 16,239,003  
Pound sterling [member] | Fixed rate senior notes interest rate 4.948% maturing 2033 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 4.948% 4.948% 4.948%
Borrowings maturity 2033 2033  
Borrowings $ 8,180,962 $ 7,494,924  
Pound sterling [member] | Fixed rate senior notes interest rate 4.375% maturing 2041 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 4.375% 4.375% 4.375%
Borrowings maturity 2041 2041  
Borrowings $ 20,452,405 $ 18,737,311  
Pound sterling [member] | GBP NC7 capital securities interest rate 6.375% maturing 2073 [member] | Hybrid Notes [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate   6.375%  
Borrowings maturity   2073  
Borrowings   $ 13,740,695  
Brazilian reais [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings $ 32,533,191 $ 34,948,736  
Brazilian reais [member] | Debenture 102.900% of CDI maturing 2020 [member]      
Disclosure of detailed information about borrowings [line items]      
Interbank certificate of deposit interest rate basis   102.900% of CDI  
Borrowings maturity   2020  
Adjustment of interbank certificate of deposit   102.90%  
Borrowings   $ 7,013,124  
Brazilian reais [member] | Debenture 104.000% of CDI maturing 2021 [member]      
Disclosure of detailed information about borrowings [line items]      
Interbank certificate of deposit interest rate basis 104.000% of CDI 104.000% of CDI  
Borrowings maturity 2021 2021  
Adjustment of interbank certificate of deposit 104.00%    
Borrowings $ 4,222,597 $ 5,142,958  
Brazilian reais [member] | Debenture 104.250% of CDI maturing 2021 [member]      
Disclosure of detailed information about borrowings [line items]      
Interbank certificate of deposit interest rate basis 104.250% of CDI 104.250% of CDI  
Borrowings maturity 2021 2021  
Adjustment of interbank certificate of deposit 104.25%    
Borrowings $ 5,815,668 $ 7,083,256  
Brazilian reais [member] | Promissory Note CDI + 0.600% maturing 2021 [Member]      
Disclosure of detailed information about borrowings [line items]      
Interbank certificate of deposit interest rate basis CDI + 0.600% CDI + 0.600%  
Borrowings maturity 2021 2021  
Adjustment of interbank certificate of deposit 0.60%    
Borrowings $ 1,381,941 $ 1,683,150  
Brazilian reais [member] | Promissory Note 106.000% of CDI maturing 2022 [member]      
Disclosure of detailed information about borrowings [line items]      
Interbank certificate of deposit interest rate basis 106.000% of CDI 106.000% of CDI  
Borrowings maturity 2022 2022  
Adjustment of interbank certificate of deposit 106.00%    
Borrowings $ 7,677,449 $ 9,350,832  
Brazilian reais [member] | Promissory Note 106.500% of CDI maturing 2022 [member]      
Disclosure of detailed information about borrowings [line items]      
Interbank certificate of deposit interest rate basis   106.500% of CDI  
Borrowings maturity   2022  
Borrowings   $ 4,675,416  
Brazilian reais [member] | Debenture 106.500% of CDI maturing 2022 [member]      
Disclosure of detailed information about borrowings [line items]      
Interbank certificate of deposit interest rate basis 106.500% of CDI    
Borrowings maturity 2022    
Adjustment of interbank certificate of deposit 106.50%    
Borrowings $ 3,838,725    
Brazilian reais [member] | Debenture CDI + 0.960% maturing 2022 [member]      
Disclosure of detailed information about borrowings [line items]      
Interbank certificate of deposit interest rate basis CDI + 0.960%    
Borrowings maturity 2022    
Adjustment of interbank certificate of deposit 0.96%    
Borrowings $ 9,596,811    
Japanese yens [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings $ 2,511,701 $ 2,255,663  
Japanese yens [member] | Fixed rate senior notes interest rate 2.950% maturing 2039 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 2.95% 2.95% 2.95%
Borrowings maturity 2039 2039  
Borrowings $ 2,511,701 $ 2,255,663  
Chilean pesos [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings $ 4,078,453 $ 3,562,695  
Chilean pesos [member] | Fixed rate senior notes interest rate 3.961% maturing 2035 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 3.961% 3.961% 3.961%
Borrowings maturity 2035 2035  
Borrowings $ 4,078,453 $ 3,562,695  
Chilean pesos [member] | Lines of credit [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings maturity 2021 2021  
Borrowings interest basis TAB + 0.350% and TAB + 0.450% TAB + 0.350%  
Borrowings $ 8,868,181 $ 4,821,222  
Chilean pesos [member] | Finance Lease [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings $ 57,266 $ 54,596  
Chilean pesos [member] | Bottom of range [member] | Finance Lease [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 8.70% 8.70% 8.70%
Borrowings maturity 2021 2020  
Chilean pesos [member] | Top of range [member] | Finance Lease [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 8.97% 8.97% 8.97%
Borrowings maturity 2027 2027  
Other currencies [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings $ 6,590,154 $ 5,818,358  
Peruvian Soles [Member] | Lines of credit [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings maturity 2021    
Borrowings interest basis 1.200% - 1.450%    
Borrowings $ 17,094,079 $ 15,351,211  
Peruvian Soles [Member] | Bottom of range [member] | Lines of credit [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate   3.55%  
Borrowings maturity   2020  
Peruvian Soles [Member] | Top of range [member] | Lines of credit [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate   3.70%  
Borrowings maturity   2021