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Bank Loans and Notes Payable - Summary of Detailed Information About Borrowings (Detail)
$ in Millions, $ in Millions
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Disclosure of detailed information about borrowings [line items]      
Short-term debt $ 225 $ 4,469 $ 3,935
Long-term debt   184,196 114,016
Current portion of long term debt (218) (4,332) (12,269)
Non-current portion of long-term debt $ 9,042 179,864 101,747
Variable rate debt [member]      
Disclosure of detailed information about borrowings [line items]      
Short-term debt   4,469 3,935
Long-term debt   14,657 14,336
Current portion of long term debt   (4,332) (12,269)
Non-current portion of long-term debt   179,864 101,747
Fixed rate debt [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   169,539 99,680
Fair value [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   203,665  
Fair value [member] | Variable rate debt [member]      
Disclosure of detailed information about borrowings [line items]      
Short-term debt   4,469  
Long-term debt   14,716  
Fair value [member] | Fixed rate debt [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   188,949  
0-1 year [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   4,332  
0-1 year [member] | Variable rate debt [member]      
Disclosure of detailed information about borrowings [line items]      
Short-term debt   4,469  
Long-term debt   938  
0-1 year [member] | Fixed rate debt [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   3,394  
Second 12 months      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   2,578  
Second 12 months | Variable rate debt [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   2,229  
Second 12 months | Fixed rate debt [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   349  
Third 12 months      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   38,391  
Third 12 months | Variable rate debt [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   391  
Third 12 months | Fixed rate debt [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   38,000  
Fourth 12 months      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   2,704  
Fourth 12 months | Variable rate debt [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   367  
Fourth 12 months | Fixed rate debt [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   2,337  
Fifth 12 months      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   7,748  
Fifth 12 months | Variable rate debt [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   7,725  
Fifth 12 months | Fixed rate debt [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   23  
Later than 5 years [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   128,443  
Later than 5 years [member] | Variable rate debt [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   3,007  
Later than 5 years [member] | Fixed rate debt [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   125,436  
Mexican peso [member] | Variable rate debt [member] | Bank loans, short-term      
Disclosure of detailed information about borrowings [line items]      
Short-term debt   $ 360 $ 100
Interest rate 5.20% 5.20% 7.90%
Mexican peso [member] | Variable rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 9,771 $ 9,864
Interest rate 8.40% 8.40% 8.40%
Mexican peso [member] | Variable rate debt [member] | Domestic senior notes [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 3,181 $ 1,459
Interest rate 4.60% 4.60% 8.00%
Mexican peso [member] | Fixed rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 165 $ 115
Interest rate 9.30% 9.30% 9.30%
Mexican peso [member] | Fixed rate debt [member] | Domestic senior notes [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 21,483 $ 18,484
Interest rate 7.00% 7.00% 6.90%
Mexican peso [member] | Fair value [member] | Variable rate debt [member] | Bank loans, short-term      
Disclosure of detailed information about borrowings [line items]      
Short-term debt   $ 360  
Mexican peso [member] | Fair value [member] | Variable rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   9,834  
Mexican peso [member] | Fair value [member] | Variable rate debt [member] | Domestic senior notes [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   3,176  
Mexican peso [member] | Fair value [member] | Fixed rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   165  
Mexican peso [member] | Fair value [member] | Fixed rate debt [member] | Domestic senior notes [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   22,638  
Mexican peso [member] | 0-1 year [member] | Variable rate debt [member] | Bank loans, short-term      
Disclosure of detailed information about borrowings [line items]      
Short-term debt   $ 360  
Interest rate 5.20% 5.20%  
Mexican peso [member] | 0-1 year [member] | Variable rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 238  
Interest rate 5.80% 5.80%  
Mexican peso [member] | 0-1 year [member] | Fixed rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 48  
Interest rate 9.10% 9.10%  
Mexican peso [member] | 0-1 year [member] | Fixed rate debt [member] | Domestic senior notes [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 2,502  
Interest rate 8.30% 8.30%  
Mexican peso [member] | Second 12 months | Variable rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 102  
Interest rate 6.00% 6.00%  
Mexican peso [member] | Second 12 months | Variable rate debt [member] | Domestic senior notes [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 1,459  
Interest rate 4.70% 4.70%  
Mexican peso [member] | Second 12 months | Fixed rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 38  
Interest rate 9.90% 9.90%  
Mexican peso [member] | Third 12 months | Variable rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 54  
Interest rate 6.20% 6.20%  
Mexican peso [member] | Third 12 months | Fixed rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 32  
Interest rate 9.50% 9.50%  
Mexican peso [member] | Third 12 months | Fixed rate debt [member] | Domestic senior notes [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 7,496  
Interest rate 5.50% 5.50%  
Mexican peso [member] | Fourth 12 months | Variable rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 367  
Interest rate 5.30% 5.30%  
Mexican peso [member] | Fourth 12 months | Fixed rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 25  
Interest rate 9.00% 9.00%  
Mexican peso [member] | Fifth 12 months | Variable rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 6,003  
Interest rate 5.00% 5.00%  
Mexican peso [member] | Fifth 12 months | Variable rate debt [member] | Domestic senior notes [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 1,722  
Interest rate 4.60% 4.60%  
Mexican peso [member] | Fifth 12 months | Fixed rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 22  
Interest rate 8.70% 8.70%  
Mexican peso [member] | Later than 5 years [member] | Variable rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 3,007  
Interest rate 5.20% 5.20%  
Mexican peso [member] | Later than 5 years [member] | Fixed rate debt [member] | Domestic senior notes [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 11,485  
Interest rate 7.70% 7.70%  
Colombian peso [member] | Variable rate debt [member] | Bank loans, short-term      
Disclosure of detailed information about borrowings [line items]      
Short-term debt   $ 492 $ 431
Interest rate 3.00% 3.00% 4.70%
Colombian peso [member] | Variable rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 25 $ 422
Interest rate 4.40% 4.40% 5.70%
Colombian peso [member] | Fixed rate debt [member] | Bank loans, short-term      
Disclosure of detailed information about borrowings [line items]      
Short-term debt   $ 168 $ 769
Interest rate 2.10% 2.10% 5.10%
Colombian peso [member] | Fair value [member] | Variable rate debt [member] | Bank loans, short-term      
Disclosure of detailed information about borrowings [line items]      
Short-term debt   $ 492  
Colombian peso [member] | Fair value [member] | Variable rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   25  
Colombian peso [member] | Fair value [member] | Fixed rate debt [member] | Bank loans, short-term      
Disclosure of detailed information about borrowings [line items]      
Short-term debt   168  
Colombian peso [member] | 0-1 year [member] | Variable rate debt [member] | Bank loans, short-term      
Disclosure of detailed information about borrowings [line items]      
Short-term debt   $ 492  
Interest rate 3.00% 3.00%  
Colombian peso [member] | 0-1 year [member] | Variable rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 18  
Interest rate 4.40% 4.40%  
Colombian peso [member] | 0-1 year [member] | Fixed rate debt [member] | Bank loans, short-term      
Disclosure of detailed information about borrowings [line items]      
Short-term debt   $ 168  
Interest rate 2.10% 2.10%  
Colombian peso [member] | Second 12 months | Variable rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 7  
Interest rate 4.40% 4.40%  
Argentine peso [member] | Variable rate debt [member] | Bank loans, short-term      
Disclosure of detailed information about borrowings [line items]      
Short-term debt     $ 32
Interest rate     54.30%
Argentine peso [member] | Fixed rate debt [member] | Bank loans, short-term      
Disclosure of detailed information about borrowings [line items]      
Short-term debt   $ 711 $ 126
Interest rate 44.70% 44.70% 63.50%
Argentine peso [member] | Fair value [member] | Fixed rate debt [member] | Bank loans, short-term      
Disclosure of detailed information about borrowings [line items]      
Short-term debt   $ 711  
Argentine peso [member] | 0-1 year [member] | Fixed rate debt [member] | Bank loans, short-term      
Disclosure of detailed information about borrowings [line items]      
Short-term debt   $ 711  
Interest rate 44.70% 44.70%  
Chilean peso [member] | Variable rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 1,633 $ 2,349
Interest rate 3.50% 3.50% 4.10%
Chilean peso [member] | Fixed rate debt [member] | Bank loans, short-term      
Disclosure of detailed information about borrowings [line items]      
Short-term debt   $ 1,027 $ 977
Interest rate 1.90% 1.90% 2.60%
Chilean peso [member] | Fixed rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 15 $ 40
Interest rate 3.20% 3.20% 3.40%
Chilean peso [member] | Fair value [member] | Variable rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 1,633  
Chilean peso [member] | Fair value [member] | Fixed rate debt [member] | Bank loans, short-term      
Disclosure of detailed information about borrowings [line items]      
Short-term debt   1,027  
Chilean peso [member] | Fair value [member] | Fixed rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   15  
Chilean peso [member] | 0-1 year [member] | Variable rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 639  
Interest rate 5.80% 5.80%  
Chilean peso [member] | 0-1 year [member] | Fixed rate debt [member] | Bank loans, short-term      
Disclosure of detailed information about borrowings [line items]      
Short-term debt   $ 1,027  
Interest rate 1.90% 1.90%  
Chilean peso [member] | 0-1 year [member] | Fixed rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 15  
Interest rate 3.20% 3.20%  
Chilean peso [member] | Second 12 months | Variable rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 657  
Interest rate 2.00% 2.00%  
Chilean peso [member] | Third 12 months | Variable rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 337  
Interest rate 2.00% 2.00%  
USD | Fixed rate debt [member] | Bank loans, short-term      
Disclosure of detailed information about borrowings [line items]      
Short-term debt   $ 1,150 $ 1,038
Interest rate 2.00% 2.00% 2.60%
USD | Fixed rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 2,293 $ 2,185
Interest rate 3.70% 3.70% 3.60%
USD | Fixed rate debt [member] | Yankee bond, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 50,597 $ 37,575
Interest rate 3.10% 3.10% 4.50%
USD | Fixed rate debt [member] | Bank of NY, USD, due 2023      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 5,975 $ 5,593
Interest rate 2.90% 2.90% 2.90%
USD | Fixed rate debt [member] | Bank of NY, USD, due 2043      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 13,805 $ 12,943
Interest rate 4.40% 4.40% 4.40%
USD | Fixed rate debt [member] | Bank of NY (FEMSA USD 2050)      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 49,549  
Interest rate 3.50% 3.50%  
USD | Fair value [member] | Fixed rate debt [member] | Bank loans, short-term      
Disclosure of detailed information about borrowings [line items]      
Short-term debt   $ 1,150  
USD | Fair value [member] | Fixed rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   2,293  
USD | Fair value [member] | Fixed rate debt [member] | Yankee bond, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   57,967  
USD | Fair value [member] | Fixed rate debt [member] | Bank of NY, USD, due 2023      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   6,258  
USD | Fair value [member] | Fixed rate debt [member] | Bank of NY, USD, due 2043      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   17,486  
USD | Fair value [member] | Fixed rate debt [member] | Bank of NY (FEMSA USD 2050)      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   55,422  
USD | 0-1 year [member] | Fixed rate debt [member] | Bank loans, short-term      
Disclosure of detailed information about borrowings [line items]      
Short-term debt   $ 1,150  
Interest rate 2.00% 2.00%  
USD | Third 12 months | Fixed rate debt [member] | Bank of NY, USD, due 2023      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 5,975  
Interest rate 2.90% 2.90%  
USD | Fourth 12 months | Fixed rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 2,293  
Interest rate 3.70% 3.70%  
USD | Later than 5 years [member] | Fixed rate debt [member] | Yankee bond, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 50,597  
Interest rate 3.10% 3.10%  
USD | Later than 5 years [member] | Fixed rate debt [member] | Bank of NY, USD, due 2043      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 13,805  
Interest rate 4.40% 4.40%  
USD | Later than 5 years [member] | Fixed rate debt [member] | Bank of NY (FEMSA USD 2050)      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 49,549  
Interest rate 3.50% 3.50%  
Uruguayan peso [member] | Fixed rate debt [member] | Bank loans, short-term      
Disclosure of detailed information about borrowings [line items]      
Short-term debt   $ 498 $ 63
Interest rate 15.10% 15.10% 11.60%
Uruguayan peso [member] | Fixed rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 1,031 $ 1,265
Interest rate 10.80% 10.80% 5.80%
Uruguayan peso [member] | Fair value [member] | Fixed rate debt [member] | Bank loans, short-term      
Disclosure of detailed information about borrowings [line items]      
Short-term debt   $ 498  
Uruguayan peso [member] | Fair value [member] | Fixed rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   1,031  
Uruguayan peso [member] | 0-1 year [member] | Fixed rate debt [member] | Bank loans, short-term      
Disclosure of detailed information about borrowings [line items]      
Short-term debt   $ 498  
Interest rate 15.10% 15.10%  
Uruguayan peso [member] | 0-1 year [member] | Fixed rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 770  
Interest rate 10.30% 10.30%  
Uruguayan peso [member] | Second 12 months | Fixed rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 261  
Interest rate 12.20% 12.20%  
Guatemala, Quetzal [member] | Fixed rate debt [member] | Bank loans, short-term      
Disclosure of detailed information about borrowings [line items]      
Short-term debt   $ 63  
Interest rate 6.30% 6.30%  
Guatemala, Quetzal [member] | Fair value [member] | Fixed rate debt [member] | Bank loans, short-term      
Disclosure of detailed information about borrowings [line items]      
Short-term debt   $ 63  
Guatemala, Quetzal [member] | 0-1 year [member] | Fixed rate debt [member] | Bank loans, short-term      
Disclosure of detailed information about borrowings [line items]      
Short-term debt   $ 63  
Interest rate 6.30% 6.30%  
Brazilian reais [member] | Variable rate debt [member] | Bank loans, short-term      
Disclosure of detailed information about borrowings [line items]      
Short-term debt     $ 399
Interest rate     9.40%
Brazilian reais [member] | Variable rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 47 $ 242
Interest rate 8.10% 8.10% 7.80%
Brazilian reais [member] | Fixed rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 157 $ 434
Interest rate 6.10% 6.10% 7.30%
Brazilian reais [member] | Fair value [member] | Variable rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 48  
Brazilian reais [member] | Fair value [member] | Fixed rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   157  
Brazilian reais [member] | 0-1 year [member] | Variable rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 43  
Interest rate 8.10% 8.10%  
Brazilian reais [member] | 0-1 year [member] | Fixed rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 59  
Interest rate 5.70% 5.70%  
Brazilian reais [member] | Second 12 months | Variable rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 4  
Interest rate 8.10% 8.10%  
Brazilian reais [member] | Second 12 months | Fixed rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 50  
Interest rate 6.00% 6.00%  
Brazilian reais [member] | Third 12 months | Fixed rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 28  
Interest rate 6.40% 6.40%  
Brazilian reais [member] | Fourth 12 months | Fixed rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 19  
Interest rate 6.60% 6.60%  
Brazilian reais [member] | Fifth 12 months | Fixed rate debt [member] | Bank loans, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 1  
Interest rate 6.60% 6.60%  
Euro [member] | Fixed rate debt [member] | Senior unsecured notes, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 24,469 $ 21,046
Interest rate 1.70% 1.70% 1.70%
Euro [member] | Fair value [member] | Fixed rate debt [member] | Senior unsecured notes, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 25,517  
Euro [member] | Third 12 months | Fixed rate debt [member] | Senior unsecured notes, long-term      
Disclosure of detailed information about borrowings [line items]      
Long-term debt   $ 24,469  
Interest rate 1.70% 1.70%