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Debt - Summary of Short- and Long-Term Debt (Detail)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2017
USD ($)
Disclosure of detailed information about borrowings [line items]      
Borrowings $ 697,884,899 $ 707,801,403  
Less: Short-term debt and current portion of long-term debt 51,745,841 82,607,259 $ 2,615
Long-term debt $ 646,139,058 $ 625,194,144 $ 32,655
Hybrid Notes [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings maturity 2073 2073  
Borrowings $ 49,148,975 $ 45,685,060  
Lines of credit [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings 31,364,000 33,999,000  
Less: Short-term debt and current portion of long-term debt 22,714,383 29,619,908  
Finance Lease [member]      
Disclosure of detailed information about borrowings [line items]      
Less: Short-term debt and current portion of long-term debt 36,962 32,160  
Line of credit and others [Member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings $ 31,463,056 $ 34,125,322  
U.S. dollars [member] | Fixed-rate Senior notes interest rate 5.000% maturing 2019 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 5.00% 5.00% 5.00%
Borrowings maturity 2019 2019  
Borrowings $ 14,840,025 $ 15,548,550  
U.S. dollars [member] | Fixed-rate Senior notes interest rate 5.500% maturing 2019 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 5.50% 5.50% 5.50%
Borrowings maturity 2019 2019  
Borrowings $ 7,467,145 $ 7,823,657  
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% 5.00% 5.00%
Borrowings maturity 2020 2020  
Borrowings $ 42,043,077 $ 44,050,390  
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 $ 31,658,720 $ 33,170,240  
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 $ 19,417,282 $ 20,344,345  
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 2037 2037  
Borrowings $ 7,305,744 $ 7,654,551  
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%
Borrowings maturity 2040    
Borrowings $ 39,573,400 $ 15,548,550  
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 $ 22,754,705 $ 23,841,110  
U.S. dollars [member] | Fixed Rate Senior Notes [Member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings 185,060,098 $ 205,984,329  
U.S. dollars [member] | Lines of credit [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings maturity   2017  
Borrowings $ 14,474,350 $ 14,929,806  
U.S. dollars [member] | Lines of credit [member] | LIBOR [Member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest basis L + 0.020%    
Borrowings interest rate adjustment 0.02%   0.02%
U.S. dollars [member] | Fixed-rate Senior notes interest rate 5.625% maturing 2017 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate   5.625%  
Borrowings maturity   2017  
Borrowings   $ 12,088,686  
U.S. dollars [member] | Fixed-rate Senior notes interest rate 6.125% maturing 2040 One [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate   6.125%  
Borrowings maturity   2040  
Borrowings   $ 25,914,250  
U.S. dollars [member] | Fixed-rate Senior notes interest rate 6.125% maturing 2040 Two [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate   6.125%  
Borrowings maturity   2040  
U.S. dollars [member] | Bottom of range [member] | Lines of credit [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 1.50% 1.50% 1.50%
Borrowings maturity 2018    
U.S. dollars [member] | Top of range [member] | Lines of credit [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 7.25% 8.50% 7.25%
Borrowings maturity 2019    
Mexican pesos [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings $ 70,691,683 $ 72,415,602  
Mexican pesos [member] | Domestic Senior Notes Interest Rate 8.110% Maturing 2018 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 8.11% 8.11% 8.11%
Borrowings maturity 2018 2018  
Borrowings $ 1,750,000 $ 1,750,000  
Mexican pesos [member] | Domestic Senior Notes Interest Rate 8.270% Maturing 2018 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 8.27% 8.27% 8.27%
Borrowings maturity 2018 2018  
Borrowings $ 1,160,110 $ 1,160,109  
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% 8.60% 8.60%
Borrowings maturity 2020 2020  
Borrowings $ 7,000,000 $ 7,000,000  
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 $ 4,409,873 $ 4,133,793  
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] | Fixed Rate Senior Notes Interest Rate 6.000% Maturing 2019 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 6.00% 6.00% 6.00%
Borrowings maturity 2019 2019  
Borrowings $ 10,000,000 $ 10,000,000  
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] | 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] | Lines of credit [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings maturity   2017  
Borrowings $ 12,500,000 $ 15,111,048  
Mexican pesos [member] | Lines of credit [member] | Mexican Interbank Rate [Member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest basis TIIE + 0.040% - TIIE + 0.175% TIIE + 0.150% - TIIE + 2.000%  
Mexican pesos [member] | Domestic Senior Notes Interest Rate 8.390% Maturing 2017 [Member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate   8.39%  
Borrowings maturity   2017  
Borrowings   $ 2,000,000  
Mexican pesos [member] | Bottom of range [member] | Lines of credit [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings maturity 2018    
Mexican pesos [member] | Bottom of range [member] | Lines of credit [member] | Mexican Interbank Rate [Member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate adjustment 0.04% 0.15% 0.04%
Mexican pesos [member] | Top of range [member] | Lines of credit [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings maturity 2019    
Mexican pesos [member] | Top of range [member] | Lines of credit [member] | Mexican Interbank Rate [Member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate adjustment 0.175% 2.00% 0.175%
Euros [member] | Hybrid Notes [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings $ 34,443,203 $ 31,614,659  
Euros [member] | Fixed Rate Senior Notes [Member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings $ 263,998,076 $ 270,240,624  
Euros [member] | Fixed rate senior notes interest rate 1.000% maturing 2018 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 1.00% 1.00% 1.00%
Borrowings maturity 2018 2018  
Borrowings $ 14,252,360 $ 13,081,928  
Euros [member] | Fixed rate senior notes interest rate 4.125% maturing 2019 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 4.125% 4.125% 4.125%
Borrowings maturity 2019 2019  
Borrowings $ 23,753,933 $ 21,803,213  
Euros [member] | Exchangable bonds interest rate 0.000% maturing 2020 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 0.00% 0.00% 0.00%
Borrowings maturity 2020 2020  
Borrowings $ 67,504,878 $ 61,961,244  
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 $ 23,753,933 $ 21,803,213  
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 $ 18,727,775 $ 17,399,163  
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 $ 19,333,685 $ 18,067,554  
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 $ 17,815,450 $ 16,352,410  
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 $ 7,594,262 $ 7,047,557  
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 $ 17,815,450 $ 16,352,410  
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 $ 20,190,843 $ 18,532,731  
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 $ 17,815,450 $ 10,901,607  
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 $ 15,440,057 $ 14,172,089  
Euros [member] | Euro Nc5 series A capital securities interest rate 5.125% maturing 2073 [member] | Hybrid Notes [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 5.125% 5.125% 5.125%
Borrowings maturity 2073 2073  
Borrowings $ 21,378,540 $ 19,622,892  
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 $ 13,064,663 $ 11,991,767  
Euros [member] | Lines of credit [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate   3.525%  
Borrowings maturity   2018  
Borrowings   $ 491,144  
Euros [member] | Fixed Rate Senior Notes Interest Rate 4.250% Maturing 2017 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate   4.25%  
Borrowings maturity   2017  
Borrowings   $ 10,962,292  
Euros [member] | Fixed rate senior notes interest rate 3.750% maturing 2017 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate   3.75%  
Borrowings maturity   2017  
Borrowings   $ 21,803,213  
Pound sterling [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings 14,705,772 14,070,401  
Pound sterling [member] | Fixed Rate Senior Notes [Member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings $ 58,823,089 $ 56,281,605  
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 $ 13,368,884 $ 12,791,274  
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 $ 17,379,549 $ 16,628,656  
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 $ 8,021,330 $ 7,674,764  
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 $ 20,053,326 $ 19,186,911  
Pound sterling [member] | GBP NC7 capital securities interest rate 6.375% maturing 2073 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 6.375% 6.375% 6.375%
Borrowings maturity 2073 2073  
Borrowings $ 14,705,772 $ 14,070,401  
Swiss francs [,ember]      
Disclosure of detailed information about borrowings [line items]      
Borrowings $ 11,169,748 $ 16,682,775  
Swiss francs [,ember] | Fixed rate senior notes interest rate 1.125% maturing 2018 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 1.125% 1.125% 1.125%
Borrowings maturity 2018 2018  
Borrowings $ 11,169,748 $ 11,189,666  
Swiss francs [,ember] | Fixed rate senior notes interest rate 2.000% maturing 2017 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate   2.00%  
Borrowings maturity   2017  
Borrowings   $ 5,493,109  
Brazilian reals [member] | Domestic senior notes interest rate 102.9% of CDI maturing 2020 [member]      
Disclosure of detailed information about borrowings [line items]      
Interbank certificate of deposit interest rate basis 102.9% of CDI    
Borrowings maturity 2020    
Adjustment of interbank certificate of deposit 102.90%    
Borrowings $ 8,972,204    
Brazilian reals [member] | Domestic senior notes interest rate 102.9% of CDI maturing 2019 [member]      
Disclosure of detailed information about borrowings [line items]      
Interbank certificate of deposit interest rate basis 102.4% of CDI    
Borrowings maturity 2019    
Adjustment of interbank certificate of deposit 102.40%    
Borrowings $ 5,981,469    
Brazilian reals [member] | Domestic senior notes interest rate 103.9% of CDI maturing 2019 [member]      
Disclosure of detailed information about borrowings [line items]      
Interbank certificate of deposit interest rate basis 103.9% of CDI    
Borrowings maturity 2019    
Adjustment of interbank certificate of deposit 103.90%    
Borrowings $ 5,981,469    
Brazilian reals [member] | Domestic Senior Notes [Member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings $ 20,935,142    
Brazilian reals [member] | Lines of credit [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest basis 107.000% of CDI -TJLP + 3.500% & 3.000% -9.500%    
Borrowings $ 4,389,260 $ 3,467,091  
Brazilian reals [member] | Lines of credit [member] | Brazil Interbank Deposit Rate [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate adjustment 107.00%   107.00%
Brazilian reals [member] | Lines of credit [member] | Brazil Long Term Interest Rate [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate adjustment 3.50%   3.50%
Brazilian reals [member] | Bottom of range [member] | Lines of credit [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 3.00% 3.00% 3.00%
Borrowings maturity 2018 2018  
Brazilian reals [member] | Top of range [member] | Lines of credit [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings interest rate 9.50% 9.50% 9.50%
Borrowings maturity 2027 2021  
Japanese yens [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings $ 2,282,608 $ 2,306,643  
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 $ 2,282,608 $ 2,306,643  
Chilean pesos [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings $ 4,312,424 $ 4,079,443  
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 $ 4,312,424 $ 4,079,443  
Chilean pesos [member] | Finance Lease [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings $ 99,446 $ 126,233  
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 2018 2018  
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 $ 6,595,032 $ 6,386,086