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Note 25 - Post-employment and other employee benefit commitments. Estimated benefit payments (Details)
Dec. 31, 2020
EUR (€)
Not Later Than One Year Member  
Estimated Benefit Payments Line Items  
Total estimated Benefit Payments € 683,000,000
Later Than One Year And Not Later Than Two Years [Member]  
Estimated Benefit Payments Line Items  
Total estimated Benefit Payments 602,000,000
Later Than Two Years And Not Later Than Three Years [Member]  
Estimated Benefit Payments Line Items  
Total estimated Benefit Payments 518,000,000
Later Than Three Years And Not Later Than Four Years Member  
Estimated Benefit Payments Line Items  
Total estimated Benefit Payments 452,000,000
Later Than Four Years And Not Later Than Five Years Member  
Estimated Benefit Payments Line Items  
Total estimated Benefit Payments 408,000,000
Later Than Five Years And Not Later Than Ten Years Member  
Estimated Benefit Payments Line Items  
Total estimated Benefit Payments 1,810,000,000
Spain [Member] | Not Later Than One Year Member  
Estimated Benefit Payments Line Items  
Total estimated Benefit Payments 556,000,000
Spain [Member] | Later Than One Year And Not Later Than Two Years [Member]  
Estimated Benefit Payments Line Items  
Total estimated Benefit Payments 474,000,000
Spain [Member] | Later Than Two Years And Not Later Than Three Years [Member]  
Estimated Benefit Payments Line Items  
Total estimated Benefit Payments 388,000,000
Spain [Member] | Later Than Three Years And Not Later Than Four Years Member  
Estimated Benefit Payments Line Items  
Total estimated Benefit Payments 313,000,000
Spain [Member] | Later Than Four Years And Not Later Than Five Years Member  
Estimated Benefit Payments Line Items  
Total estimated Benefit Payments 257,000,000
Spain [Member] | Later Than Five Years And Not Later Than Ten Years Member  
Estimated Benefit Payments Line Items  
Total estimated Benefit Payments 856,000,000
Mexico [Member] | Not Later Than One Year Member  
Estimated Benefit Payments Line Items  
Total estimated Benefit Payments 111,000,000
Mexico [Member] | Later Than One Year And Not Later Than Two Years [Member]  
Estimated Benefit Payments Line Items  
Total estimated Benefit Payments 110,000,000
Mexico [Member] | Later Than Two Years And Not Later Than Three Years [Member]  
Estimated Benefit Payments Line Items  
Total estimated Benefit Payments 114,000,000
Mexico [Member] | Later Than Three Years And Not Later Than Four Years Member  
Estimated Benefit Payments Line Items  
Total estimated Benefit Payments 121,000,000
Mexico [Member] | Later Than Four Years And Not Later Than Five Years Member  
Estimated Benefit Payments Line Items  
Total estimated Benefit Payments 129,000,000
Mexico [Member] | Later Than Five Years And Not Later Than Ten Years Member  
Estimated Benefit Payments Line Items  
Total estimated Benefit Payments 774,000,000
Turkey [Member] | Not Later Than One Year Member  
Estimated Benefit Payments Line Items  
Total estimated Benefit Payments 16,000,000
Turkey [Member] | Later Than One Year And Not Later Than Two Years [Member]  
Estimated Benefit Payments Line Items  
Total estimated Benefit Payments 18,000,000
Turkey [Member] | Later Than Two Years And Not Later Than Three Years [Member]  
Estimated Benefit Payments Line Items  
Total estimated Benefit Payments 16,000,000
Turkey [Member] | Later Than Three Years And Not Later Than Four Years Member  
Estimated Benefit Payments Line Items  
Total estimated Benefit Payments 18,000,000
Turkey [Member] | Later Than Four Years And Not Later Than Five Years Member  
Estimated Benefit Payments Line Items  
Total estimated Benefit Payments 22,000,000
Turkey [Member] | Later Than Five Years And Not Later Than Ten Years Member  
Estimated Benefit Payments Line Items  
Total estimated Benefit Payments € 180,000,000