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Note 7 - Risk Management - Impairment Losses Reconciliations II (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Changes In Allowance Account For Credit Losses Of Financial Assets Abstract      
Recovery of written-off assets € (589) € (558) € (541)
Expected Credit Losses Individually and Collective Assessed [Member] | Debt Securities [Member] | Central Banks [Member]      
Reconciliation Of Changes In Allowance Account Fo rCredit Losses Of Financial Assets Line Items      
Allowance Account For Credit Losses Of Financial Assets at the beginning 0 0 0
Changes In Allowance Account For Credit Losses Of Financial Assets Abstract      
Additional Allowance Recognised In Profit Or Loss Allowance Account For Credit Losses Of Financial Assets   0 0
Reversal Allowance Account For Credit Losses Of Financial Assets   0 0
Utilisation Allowance Account For Credit Losses Of Financial Assets   0 0
Transfers Between Allowances   0 0
Increase Decrease Through Other Changes Allowance Account For Credit Losses Of Financial Assets   0 0
Allowance Account For Credit Losses Of Financial Assets at the end   0 0
Recovery of written-off assets   0 0
Expected Credit Losses Individually and Collective Assessed [Member] | Debt Securities [Member] | General Government [Member]      
Reconciliation Of Changes In Allowance Account Fo rCredit Losses Of Financial Assets Line Items      
Allowance Account For Credit Losses Of Financial Assets at the beginning 0 0 0
Changes In Allowance Account For Credit Losses Of Financial Assets Abstract      
Additional Allowance Recognised In Profit Or Loss Allowance Account For Credit Losses Of Financial Assets   0 0
Reversal Allowance Account For Credit Losses Of Financial Assets   0 0
Utilisation Allowance Account For Credit Losses Of Financial Assets   0 0
Transfers Between Allowances   0 0
Increase Decrease Through Other Changes Allowance Account For Credit Losses Of Financial Assets   0 0
Allowance Account For Credit Losses Of Financial Assets at the end   0 0
Recovery of written-off assets   0 0
Expected Credit Losses Individually and Collective Assessed [Member] | Debt Securities [Member] | Credit Institutions [Member]      
Reconciliation Of Changes In Allowance Account Fo rCredit Losses Of Financial Assets Line Items      
Allowance Account For Credit Losses Of Financial Assets at the beginning 0 (15) (20)
Changes In Allowance Account For Credit Losses Of Financial Assets Abstract      
Additional Allowance Recognised In Profit Or Loss Allowance Account For Credit Losses Of Financial Assets   (5) 0
Reversal Allowance Account For Credit Losses Of Financial Assets   4 0
Utilisation Allowance Account For Credit Losses Of Financial Assets   0 5
Transfers Between Allowances   16 0
Increase Decrease Through Other Changes Allowance Account For Credit Losses Of Financial Assets   0 0
Allowance Account For Credit Losses Of Financial Assets at the end   0 (15)
Recovery of written-off assets   0 0
Expected Credit Losses Individually and Collective Assessed [Member] | Debt Securities [Member] | Other Financial Institutions [Member]      
Reconciliation Of Changes In Allowance Account Fo rCredit Losses Of Financial Assets Line Items      
Allowance Account For Credit Losses Of Financial Assets at the beginning (16) (26) (15)
Changes In Allowance Account For Credit Losses Of Financial Assets Abstract      
Additional Allowance Recognised In Profit Or Loss Allowance Account For Credit Losses Of Financial Assets   (4) (29)
Reversal Allowance Account For Credit Losses Of Financial Assets   2 3
Utilisation Allowance Account For Credit Losses Of Financial Assets   0 26
Transfers Between Allowances   0 (10)
Increase Decrease Through Other Changes Allowance Account For Credit Losses Of Financial Assets   13 (1)
Allowance Account For Credit Losses Of Financial Assets at the end   (16) (26)
Recovery of written-off assets   0 0
Expected Credit Losses Individually and Collective Assessed [Member] | Debt Securities [Member] | Corporate Entities [Member]      
Reconciliation Of Changes In Allowance Account Fo rCredit Losses Of Financial Assets Line Items      
Allowance Account For Credit Losses Of Financial Assets at the beginning (12) (103) 0
Changes In Allowance Account For Credit Losses Of Financial Assets Abstract      
Additional Allowance Recognised In Profit Or Loss Allowance Account For Credit Losses Of Financial Assets   (17) (138)
Reversal Allowance Account For Credit Losses Of Financial Assets   0 3
Utilisation Allowance Account For Credit Losses Of Financial Assets   0 33
Transfers Between Allowances   107 0
Increase Decrease Through Other Changes Allowance Account For Credit Losses Of Financial Assets   0 (1)
Allowance Account For Credit Losses Of Financial Assets at the end   (12) (103)
Recovery of written-off assets   0 0
Expected Credit Losses Individually and Collective Assessed [Member] | Debt Securities [Member] | Total [Member]      
Reconciliation Of Changes In Allowance Account Fo rCredit Losses Of Financial Assets Line Items      
Allowance Account For Credit Losses Of Financial Assets at the beginning (28) (144) (35)
Changes In Allowance Account For Credit Losses Of Financial Assets Abstract      
Additional Allowance Recognised In Profit Or Loss Allowance Account For Credit Losses Of Financial Assets   (26) (167)
Reversal Allowance Account For Credit Losses Of Financial Assets   6 6
Utilisation Allowance Account For Credit Losses Of Financial Assets   0 64
Transfers Between Allowances   123 (10)
Increase Decrease Through Other Changes Allowance Account For Credit Losses Of Financial Assets   13 (2)
Allowance Account For Credit Losses Of Financial Assets at the end   (28) (144)
Recovery of written-off assets   0 0
Expected Credit Losses Individually and Collective Assessed [Member] | Loans and receivables [Member] | Central Banks [Member]      
Reconciliation Of Changes In Allowance Account Fo rCredit Losses Of Financial Assets Line Items      
Allowance Account For Credit Losses Of Financial Assets at the beginning 0 0 0
Changes In Allowance Account For Credit Losses Of Financial Assets Abstract      
Additional Allowance Recognised In Profit Or Loss Allowance Account For Credit Losses Of Financial Assets   0 0
Reversal Allowance Account For Credit Losses Of Financial Assets   0 0
Utilisation Allowance Account For Credit Losses Of Financial Assets   0 0
Transfers Between Allowances   0 0
Increase Decrease Through Other Changes Allowance Account For Credit Losses Of Financial Assets   0 0
Allowance Account For Credit Losses Of Financial Assets at the end   0 0
Recovery of written-off assets   0 0
Expected Credit Losses Individually and Collective Assessed [Member] | Loans and receivables [Member] | General Government [Member]      
Reconciliation Of Changes In Allowance Account Fo rCredit Losses Of Financial Assets Line Items      
Allowance Account For Credit Losses Of Financial Assets at the beginning (42) (39) (37)
Changes In Allowance Account For Credit Losses Of Financial Assets Abstract      
Additional Allowance Recognised In Profit Or Loss Allowance Account For Credit Losses Of Financial Assets   (70) (2)
Reversal Allowance Account For Credit Losses Of Financial Assets   37 20
Utilisation Allowance Account For Credit Losses Of Financial Assets   14 6
Transfers Between Allowances   1 (27)
Increase Decrease Through Other Changes Allowance Account For Credit Losses Of Financial Assets   15 2
Allowance Account For Credit Losses Of Financial Assets at the end   (42) (39)
Recovery of written-off assets   1 1
Expected Credit Losses Individually and Collective Assessed [Member] | Loans and receivables [Member] | Credit Institutions [Member]      
Reconciliation Of Changes In Allowance Account Fo rCredit Losses Of Financial Assets Line Items      
Allowance Account For Credit Losses Of Financial Assets at the beginning (6) (7) (17)
Changes In Allowance Account For Credit Losses Of Financial Assets Abstract      
Additional Allowance Recognised In Profit Or Loss Allowance Account For Credit Losses Of Financial Assets   (2) (2)
Reversal Allowance Account For Credit Losses Of Financial Assets   2 3
Utilisation Allowance Account For Credit Losses Of Financial Assets   0 0
Transfers Between Allowances   0 10
Increase Decrease Through Other Changes Allowance Account For Credit Losses Of Financial Assets   1 (3)
Allowance Account For Credit Losses Of Financial Assets at the end   (6) (7)
Recovery of written-off assets   0 0
Expected Credit Losses Individually and Collective Assessed [Member] | Loans and receivables [Member] | Other Financial Institutions [Member]      
Reconciliation Of Changes In Allowance Account Fo rCredit Losses Of Financial Assets Line Items      
Allowance Account For Credit Losses Of Financial Assets at the beginning (7) (25) (38)
Changes In Allowance Account For Credit Losses Of Financial Assets Abstract      
Additional Allowance Recognised In Profit Or Loss Allowance Account For Credit Losses Of Financial Assets   (287) (34)
Reversal Allowance Account For Credit Losses Of Financial Assets   3 9
Utilisation Allowance Account For Credit Losses Of Financial Assets   38 22
Transfers Between Allowances   227 10
Increase Decrease Through Other Changes Allowance Account For Credit Losses Of Financial Assets   38 6
Allowance Account For Credit Losses Of Financial Assets at the end   (7) (25)
Recovery of written-off assets   0 0
Expected Credit Losses Individually and Collective Assessed [Member] | Loans and receivables [Member] | Corporate Entities [Member]      
Reconciliation Of Changes In Allowance Account Fo rCredit Losses Of Financial Assets Line Items      
Allowance Account For Credit Losses Of Financial Assets at the beginning (5,599) (7,402) (9,225)
Changes In Allowance Account For Credit Losses Of Financial Assets Abstract      
Additional Allowance Recognised In Profit Or Loss Allowance Account For Credit Losses Of Financial Assets   (3,627) (3,705)
Reversal Allowance Account For Credit Losses Of Financial Assets   1,993 2,158
Utilisation Allowance Account For Credit Losses Of Financial Assets   3,029 3,257
Transfers Between Allowances   (228) (278)
Increase Decrease Through Other Changes Allowance Account For Credit Losses Of Financial Assets   636 391
Allowance Account For Credit Losses Of Financial Assets at the end   (5,599) (7,402)
Recovery of written-off assets   345 335
Expected Credit Losses Individually and Collective Assessed [Member] | Loans and receivables [Member] | Households [Member]      
Reconciliation Of Changes In Allowance Account Fo rCredit Losses Of Financial Assets Line Items      
Allowance Account For Credit Losses Of Financial Assets at the beginning (3,022) (3,319) (3,514)
Changes In Allowance Account For Credit Losses Of Financial Assets Abstract      
Additional Allowance Recognised In Profit Or Loss Allowance Account For Credit Losses Of Financial Assets   (3,472) (3,002)
Reversal Allowance Account For Credit Losses Of Financial Assets   837 511
Utilisation Allowance Account For Credit Losses Of Financial Assets   1,422 2,325
Transfers Between Allowances   1,687 172
Increase Decrease Through Other Changes Allowance Account For Credit Losses Of Financial Assets   (177) 189
Allowance Account For Credit Losses Of Financial Assets at the end   (3,022) (3,319)
Recovery of written-off assets   212 205
Expected Credit Losses Individually and Collective Assessed [Member] | Loans and receivables [Member] | Total [Member]      
Reconciliation Of Changes In Allowance Account Fo rCredit Losses Of Financial Assets Line Items      
Allowance Account For Credit Losses Of Financial Assets at the beginning (8,675) (10,793) (12,831)
Changes In Allowance Account For Credit Losses Of Financial Assets Abstract      
Additional Allowance Recognised In Profit Or Loss Allowance Account For Credit Losses Of Financial Assets   (7,458) (6,745)
Reversal Allowance Account For Credit Losses Of Financial Assets   2,872 2,702
Utilisation Allowance Account For Credit Losses Of Financial Assets   4,503 5,610
Transfers Between Allowances   1,687 (113)
Increase Decrease Through Other Changes Allowance Account For Credit Losses Of Financial Assets   513 585
Allowance Account For Credit Losses Of Financial Assets at the end   (8,675) (10,793)
Recovery of written-off assets   558 540
Expected Credit Losses Individually and Collective Assessed [Member] | Total [Member] | Total [Member]      
Reconciliation Of Changes In Allowance Account Fo rCredit Losses Of Financial Assets Line Items      
Allowance Account For Credit Losses Of Financial Assets at the beginning (8,703) [1] (10,937) [1],[2] (12,866) [2]
Changes In Allowance Account For Credit Losses Of Financial Assets Abstract      
Additional Allowance Recognised In Profit Or Loss Allowance Account For Credit Losses Of Financial Assets   (7,484) [1] (6,912) [2]
Reversal Allowance Account For Credit Losses Of Financial Assets   2,878 [1] 2,708 [2]
Utilisation Allowance Account For Credit Losses Of Financial Assets   4,503 [1] 5,673 [2]
Transfers Between Allowances   1,810 [1] (123) [2]
Increase Decrease Through Other Changes Allowance Account For Credit Losses Of Financial Assets   526 [1] 583 [2]
Allowance Account For Credit Losses Of Financial Assets at the end [1]   (8,703) (10,937) [2]
Recovery of written-off assets   558 [1] 540 [2]
Collective Allowance Incurred But Not Recognized [Member] | Debt Securities [Member] | Total [Member]      
Reconciliation Of Changes In Allowance Account Fo rCredit Losses Of Financial Assets Line Items      
Allowance Account For Credit Losses Of Financial Assets at the beginning (21) (46) (113)
Changes In Allowance Account For Credit Losses Of Financial Assets Abstract      
Additional Allowance Recognised In Profit Or Loss Allowance Account For Credit Losses Of Financial Assets   (8) (11)
Reversal Allowance Account For Credit Losses Of Financial Assets   30 15
Utilisation Allowance Account For Credit Losses Of Financial Assets   1 1
Transfers Between Allowances   0 64
Increase Decrease Through Other Changes Allowance Account For Credit Losses Of Financial Assets   3 0
Allowance Account For Credit Losses Of Financial Assets at the end   (21) (46)
Recovery of written-off assets   0 0
Collective Allowance Incurred But Not Recognized [Member] | Loans and receivables [Member] | Total [Member]      
Reconciliation Of Changes In Allowance Account Fo rCredit Losses Of Financial Assets Line Items      
Allowance Account For Credit Losses Of Financial Assets at the beginning (21) (5,224) (5,911)
Changes In Allowance Account For Credit Losses Of Financial Assets Abstract      
Additional Allowance Recognised In Profit Or Loss Allowance Account For Credit Losses Of Financial Assets   (1,776) (1,546)
Reversal Allowance Account For Credit Losses Of Financial Assets   2,128 1,449
Utilisation Allowance Account For Credit Losses Of Financial Assets   1,536 87
Transfers Between Allowances   (1,328) 711
Increase Decrease Through Other Changes Allowance Account For Credit Losses Of Financial Assets   554 (15)
Allowance Account For Credit Losses Of Financial Assets at the end   (21) (5,224)
Recovery of written-off assets   0 0
Collective Allowance Incurred But Not Recognized [Member] | Total [Member] | Total [Member]      
Reconciliation Of Changes In Allowance Account Fo rCredit Losses Of Financial Assets Line Items      
Allowance Account For Credit Losses Of Financial Assets at the beginning (4,130) (5,270) (6,024)
Changes In Allowance Account For Credit Losses Of Financial Assets Abstract      
Additional Allowance Recognised In Profit Or Loss Allowance Account For Credit Losses Of Financial Assets   (1,783) (1,558)
Reversal Allowance Account For Credit Losses Of Financial Assets   2,159 1,463
Utilisation Allowance Account For Credit Losses Of Financial Assets   1,537 88
Transfers Between Allowances   (1,328) 775
Increase Decrease Through Other Changes Allowance Account For Credit Losses Of Financial Assets   557 (15)
Allowance Account For Credit Losses Of Financial Assets at the end   (4,130) (5,270)
Recovery of written-off assets   0 1
Total [Member] | Total [Member] | Total [Member]      
Reconciliation Of Changes In Allowance Account Fo rCredit Losses Of Financial Assets Line Items      
Allowance Account For Credit Losses Of Financial Assets at the beginning € (12,833) (16,206) (18,890)
Changes In Allowance Account For Credit Losses Of Financial Assets Abstract      
Additional Allowance Recognised In Profit Or Loss Allowance Account For Credit Losses Of Financial Assets   (9,267) (8,470)
Reversal Allowance Account For Credit Losses Of Financial Assets   5,037 4,172
Utilisation Allowance Account For Credit Losses Of Financial Assets   6,038 5,762
Transfers Between Allowances   482 652
Increase Decrease Through Other Changes Allowance Account For Credit Losses Of Financial Assets   1,083 568
Allowance Account For Credit Losses Of Financial Assets at the end   (12,833) (16,206)
Recovery of written-off assets   € 558 € 541
[1]

(*) Figures originally report ed in the year 2017 in accordance to the applicable regulation, without restatements.

[2]

*) Figures originally reported in the year 2016 in accordance to the applicable regulation, without restatements.