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Borrowings And Lease Liabilities - Additional Information (Detail) - Ita Unibanco [Member]
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]    
Maturity March 8, 2021 March 8, 2021
Borrowings Term 36 months 36 months