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Note 7 - Risk Management -Liquidity Risk - Loans to Stable Customer Deposits (LtSCD) (Details)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
LtSCD Line Items      
Average LtSCD 95% 108% 106%
BBVA Eurozone [Member]      
LtSCD Line Items      
Average LtSCD 173% 147% 145%
Garanti Bank [Member]      
LtSCD Line Items      
Average LtSCD 183% 206% 209%
BBVA USA [Member]      
LtSCD Line Items      
Average LtSCD [1] 144% 145% 143%
Mexico Member [Member]      
LtSCD Line Items      
Average LtSCD 196% 147% 154%
[1]

(*) BBVA USA LCR calculated according to local regulation (Fed Modified LCR ).