XML 159 R107.htm IDEA: XBRL DOCUMENT v3.19.1
Financial Assets at Fair Value Through Other Comprehensive Income - Summary of Gross Carrying Amount and Fair Value of Financial Assets Through Other Comprehensive Income-Securities by Maturity (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Gross carrying amount R$ 10,666 R$ 9,546  
Current Fair value 10,684 9,666  
Non-current gross carrying amount 37,997 41,662  
Non-current fair value 38,639 42,483  
Gross carrying amount 48,663 51,208  
Fair value 49,323 52,149 R$ 40,039
Non-stated maturity [Member]      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Gross carrying amount 77 73  
Current Fair value 161 148  
Up to one year [Member]      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Gross carrying amount 10,589 9,473  
Current Fair value 10,523 9,518  
From one to five years [Member]      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Non-current gross carrying amount 21,417 23,138  
Non-current fair value 21,650 23,415  
From five to ten years [Member]      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Non-current gross carrying amount 11,906 11,368  
Non-current fair value 12,029 11,680  
After ten years [Member]      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Non-current gross carrying amount 4,674 7,156  
Non-current fair value R$ 4,960 R$ 7,388