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Intangible Assets - Disclosure of Detailed Information About Key Assumptions by CGU for Impairment Test (Detail)
Dec. 31, 2020
Dec. 31, 2019
Mexico    
Disclosure of detailed information about intangible assets [line items]    
Pre-tax WACC 7.40% 7.30%
Post –tax WACC 5.30% 5.20%
Brazil    
Disclosure of detailed information about intangible assets [line items]    
Pre-tax WACC 9.10% 9.30%
Post –tax WACC 6.00% 5.60%
Colombia    
Disclosure of detailed information about intangible assets [line items]    
Pre-tax WACC 11.00% 8.90%
Post –tax WACC 7.30% 6.20%
Argentina    
Disclosure of detailed information about intangible assets [line items]    
Pre-tax WACC 26.30% 21.60%
Post –tax WACC 20.40% 14.80%
Guatemala    
Disclosure of detailed information about intangible assets [line items]    
Pre-tax WACC 10.60% 9.10%
Post –tax WACC 8.30% 7.10%
Costa Rica    
Disclosure of detailed information about intangible assets [line items]    
Pre-tax WACC 15.30% 13.80%
Post –tax WACC 10.80% 9.70%
Nicaragua    
Disclosure of detailed information about intangible assets [line items]    
Pre-tax WACC 20.60% 21.10%
Post –tax WACC 13.90% 12.40%
Panama    
Disclosure of detailed information about intangible assets [line items]    
Pre-tax WACC 8.80% 8.50%
Post –tax WACC 6.80% 6.60%
Uruguay    
Disclosure of detailed information about intangible assets [line items]    
Pre-tax WACC 9.90% 9.40%
Post –tax WACC 7.10% 6.80%
2021-2030 | Mexico    
Disclosure of detailed information about intangible assets [line items]    
Expected annual long term inflation 3.90%  
Expected volume growth rates 2.00%  
2021-2030 | Brazil    
Disclosure of detailed information about intangible assets [line items]    
Expected annual long term inflation 3.00%  
Expected volume growth rates 2.40%  
2021-2030 | Colombia    
Disclosure of detailed information about intangible assets [line items]    
Expected annual long term inflation 2.80%  
Expected volume growth rates 4.10%  
2021-2030 | Argentina    
Disclosure of detailed information about intangible assets [line items]    
Expected annual long term inflation 30.10%  
Expected volume growth rates 3.90%  
2021-2030 | Guatemala    
Disclosure of detailed information about intangible assets [line items]    
Expected annual long term inflation 3.10%  
Expected volume growth rates 6.80%  
2021-2030 | Costa Rica    
Disclosure of detailed information about intangible assets [line items]    
Expected annual long term inflation 2.70%  
Expected volume growth rates 4.30%  
2021-2030 | Nicaragua    
Disclosure of detailed information about intangible assets [line items]    
Expected annual long term inflation 3.70%  
Expected volume growth rates 7.10%  
2021-2030 | Panama    
Disclosure of detailed information about intangible assets [line items]    
Expected annual long term inflation 1.50%  
Expected volume growth rates 7.90%  
2021-2030 | Uruguay    
Disclosure of detailed information about intangible assets [line items]    
Expected annual long term inflation 7.80%  
Expected volume growth rates 2.00%  
2020-2029 | Mexico    
Disclosure of detailed information about intangible assets [line items]    
Expected annual long term inflation   3.50%
Expected volume growth rates   0.70%
2020-2029 | Brazil    
Disclosure of detailed information about intangible assets [line items]    
Expected annual long term inflation   3.60%
Expected volume growth rates   2.00%
2020-2029 | Colombia    
Disclosure of detailed information about intangible assets [line items]    
Expected annual long term inflation   3.10%
Expected volume growth rates   4.00%
2020-2029 | Argentina    
Disclosure of detailed information about intangible assets [line items]    
Expected annual long term inflation   39.20%
Expected volume growth rates   3.70%
2020-2029 | Guatemala    
Disclosure of detailed information about intangible assets [line items]    
Expected annual long term inflation   4.00%
Expected volume growth rates   8.50%
2020-2029 | Costa Rica    
Disclosure of detailed information about intangible assets [line items]    
Expected annual long term inflation   2.20%
Expected volume growth rates   2.10%
2020-2029 | Nicaragua    
Disclosure of detailed information about intangible assets [line items]    
Expected annual long term inflation   4.40%
Expected volume growth rates   3.00%
2020-2029 | Panama    
Disclosure of detailed information about intangible assets [line items]    
Expected annual long term inflation   2.00%
Expected volume growth rates   5.40%
2020-2029 | Uruguay    
Disclosure of detailed information about intangible assets [line items]    
Expected annual long term inflation   7.40%
Expected volume growth rates   2.00%