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Group structure - Summary of Direct and Indirect Interests of Company in Its Subsidiaries (Detail)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
XP Investimentos SA [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation Brazil    
Principal activities Holding    
% of Group's interest (i) 100.00% 100.00% 100.00%
XP Investimentos Corretora de Cmbio Ttulos e Valores Mobilirios SA [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation Brazil    
Principal activities Broker-dealer    
% of Group's interest (i) 100.00% 100.00% 100.00%
XP Investments US LLC [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation USA    
Principal activities Broker-dealer    
% of Group's interest (i) 100.00% 100.00% 100.00%
XP Investments UK LLP [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation UK    
Principal activities Inter-dealer broker and Organized Trading Facility (OTF)    
% of Group's interest (i) 100.00% 100.00% 99.90%
Sartus Capital LTD [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation UK    
Principal activities Investment advisor    
% of Group's interest (i) 100.00% 100.00% 100.00%
XP Private Europe SA [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation UK    
Principal activities Investment advisor    
% of Group's interest (i) 100.00% 100.00% 100.00%
XP Vida e Previdncia SA v [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation Brazil    
Principal activities Private pension and insurance    
% of Group's interest (i) 100.00% 100.00%  
Banco XP SA vi [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation Brazil    
Principal activities Multipurpose bank    
% of Group's interest (i) 100.00%    
Xperience Market Services LLC vi [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation USA    
Principal activities Non-operational    
% of Group's interest (i) 100.00%    
Chamaleon Bravery Unipessoal LDA vi [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation Portugal    
Principal activities Investment Advisor (pending regulatory approval)    
% of Group's interest (i) 100.00%    
XP Holding Investimentos SA [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation Brazil    
Principal activities Financial Holding    
% of Group's interest (i)     100.00%
XP Controle 3 Participaes SA [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation Brazil    
Principal activities Financial Holding    
% of Group's interest (i) 100.00% 100.00% 100.00%
XPE Infomoney Educao Assessoria Empresarial e Participaes Ltda [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation Brazil    
Principal activities Digital Content services    
% of Group's interest (i) 99.99% 99.70% 96.69%
Tecfinance Informtica e Projetos de Sistemas Ltda [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation Brazil    
Principal activities Rendering of IT services    
% of Group's interest (i) 99.76% 99.73% 99.73%
XP Corretora de Seguros Ltda [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation Brazil    
Principal activities Insurance Broker    
% of Group's interest (i) 99.99% 99.82% 99.81%
XP Gesto de Recursos Ltda [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation Brazil    
Principal activities Asset management    
% of Group's interest (i) 93.70% 92.80% 91.65%
XP Finanas Assessoria Financeira Ltda [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation Brazil    
Principal activities Investment consulting service    
% of Group's interest (i) 99.99% 99.99% 99.95%
Infostocks Informaes e Sistemas Ltda [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation Brazil    
Principal activities Mediation of information systems    
% of Group's interest (i) 99.99% 99.99% 99.99%
XP Advisory Gesto Recursos Ltda [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation Brazil    
Principal activities Asset management    
% of Group's interest (i) 99.57% 99.52% 99.52%
XDEX Intermediao Ltda iii [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation Brazil    
Principal activities Intermediary and service agency    
% of Group's interest (i)     99.99%
XP Holding International LLCii [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation USA    
Principal activities International financial holding    
% of Group's interest (i) 100.00% 100.00% 100.00%
XP Advisory US [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation USA    
Principal activities Investment advisor    
% of Group's interest (i) 100.00% 100.00% 100.00%
XP Holding UK Ltd [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation UK    
Principal activities International financial holding    
% of Group's interest (i) 100.00% 100.00% 100.00%
XP Vista Asset Management Ltda iv [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation Brazil    
Principal activities Asset management    
% of Group's interest (i) 99.42% 99.60%  
XP Controle 4 Participaes SA v [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation Brazil    
Principal activities Insurance holding    
% of Group's interest (i) 100.00% 100.00%  
Leadr Servios Online Ltda vi [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation Brazil    
Principal activities Social media    
% of Group's interest (i) 99.99%    
Spiti Anlise Ltda vi [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation Brazil    
Principal activities Research (pending regulatory approval)    
% of Group's interest (i) 99.99%    
Falx Fundo de Investimento Multimercado Crdito Privado Investimento no Exterior [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation Brazil    
Principal activities Investment fund    
% of Group's interest (i) 100.00% 100.00% 100.00%
Gladius Fundo de Investimento Multimercado Investimento no Exterior [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation Brazil    
Principal activities Investment fund    
% of Group's interest (i) 100.00% 100.00% 100.00%
Scorpio Debentures Incentivadas Fundo de Investimento Multimercado Crdito Privado [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation Brazil    
Principal activities Investment fund    
% of Group's interest (i) 100.00% 100.00% 100.00%
Galea Fundo de Investimento Multimercado Crdito Privado Investimento no Exterior [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation Brazil    
Principal activities Investment fund    
% of Group's interest (i) 100.00% 100.00% 100.00%
Javelin Fundo de Investimento Multimercado Crdito Privado Investimento no Exterior [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation Brazil    
Principal activities Investment fund    
% of Group's interest (i) 100.00% 100.00% 100.00%
Spatha Fundo de Investimento Multimercado Crdito Privado Investimento no Exterior [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation Brazil    
Principal activities Investment fund    
% of Group's interest (i) 100.00% 100.00%  
Frade Fundo de Investimento em Cotas de Fundos de Investimento em Direitos Creditrios NP [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation Brazil    
Principal activities Investment fund    
% of Group's interest (i) 100.00% 100.00%  
Frade III Fundo de Investimento em Cotas de Fundo de Investimento Multimercado Crdito Privado vi [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation Brazil    
Principal activities Investment fund    
% of Group's interest (i) 100.00%    
Balista Debentures Incentivadas Fundo de Investimento Multimercado Crdito Privado vi [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation Brazil    
Principal activities Investment fund    
% of Group's interest (i) 100.00%    
Coliseu Fundo de Investimento Multimercado Crdito Privado Investimento no Exterior vi [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation Brazil    
Principal activities Investment fund    
% of Group's interest (i) 100.00%    
XP Short Brasil Alavancado Fundo de Investimento Multimercado Investimento no Exterior vii [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation Brazil    
Principal activities Investment fund    
% of Group's interest (i)     100.00%
XP Pacote Brasil Alavancado Fundo de Investimento Multimercado Investimento no Exterior vii [member]      
Disclosure of subsidiaries [line items]      
Country of incorporation Brazil    
Principal activities Investment fund    
% of Group's interest (i)     100.00%