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Note 25 - Post-employment and other employee benefit commitments. Defined Benefits (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Employer contributions |  | € 89 |  | € 87 | € 87
Past service costs |  | (33) |  | 3 | (2)
Remeasurements | [1] | (10) |  | 31 | 3
Other effects |  | 28 |  | 82 | 95
Provisions to postemplyment benefit commitments for members of the borard of directors and the banks management |  | 332 |  |  |
Commitments To Former Members Of Board Of Directors And Management |  | € 1,793 |  | 2,210 | 2,559
Number of emplyees who acept the option to take retirement or early retirement earlier than the age stipulated in the collective labor agreement in force |  | In addition, during the year 2018, Group entities in Spain offered certain employees the option to take retirement or early retirement (that is, earlier than the age stipulated in the collective labor agreement in force). This offer was accepted by 489 employees (731 and 613 employees during years 2017 and 2016, respectively). These commitments include the compensation and indemnities due as well as the contributions payable to external pension funds during the early retirement period |  |  |
Long Term Defined Benefit Commitments [Member] | Present Value Of Defined Benefit Obligation Member | Spain |  |  |  |  |
Disclosure Of Net Defined Benefit Liability Asset Line Items |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the beginning |  | € 5,442 |  | 6,157 |
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the end |  | 4,807 |  | 5,442 | 6,157
Long Term Defined Benefit Commitments [Member] | Present Value Of Defined Benefit Obligation Member | Mexico [Member] |  |  |  |  |
Disclosure Of Net Defined Benefit Liability Asset Line Items |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the beginning |  | 1,661 |  | 1,456 |
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the end |  | 1,615 |  | 1,661 | 1,456
Long Term Defined Benefit Commitments [Member] | Present Value Of Defined Benefit Obligation Member | United States [Member] |  |  |  |  |
Disclosure Of Net Defined Benefit Liability Asset Line Items |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the beginning |  | 360 |  | 385 |
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the end |  | 326 |  | 360 | 385
Long Term Defined Benefit Commitments [Member] | Present Value Of Defined Benefit Obligation Member | Turkey [Member] |  |  |  |  |
Disclosure Of Net Defined Benefit Liability Asset Line Items |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the beginning |  | 520 |  | 447 |
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the end |  | 422 |  | 520 | 447
Long Term Defined Benefit Commitments [Member] | Present Value Of Defined Benefit Obligation Member | Total [Member] |  |  |  |  |
Disclosure Of Net Defined Benefit Liability Asset Line Items |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the beginning |  | 8,384 |  | 8,851 | 9,184
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Current service cost t |  | 61 |  | 64 | 67
Interest income or expense |  | 292 |  | 290 | 299
Contributions by plan participants |  | 4 |  | 4 | 5
Employer contributions |  | 0 |  | 0 | 0
Past service costs |  | 109 | [2] | 231 | 235
Remeasurements |  | (263) |  | 331 | 354
Return on plan assets |  | 0 | [3] | 0 | 0
ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset |  | 14 |  | 100 | 107
From changes in financial assumptions |  | (274) |  | 220 | 106
Other actuarial gain and losses |  | (3) |  | 12 | 141
Benefit payments |  | (979) |  | (1,029) | (1,052)
Settlement payments |  | 0 |  | 0 | (43)
Business combinations and disposals |  | 0 |  | 0 | 0
Effect on changes in foreign exchange rates |  | (31) |  | (278) | (282)
Other effects |  | 10 |  | (1) | 84
Liability Asset Of Defined Benefit Plans at the end |  | 7,585 |  | 8,384 | 8,851
Long Term Defined Benefit Commitments [Member] | Plan Assets Member | Spain |  |  |  |  |
Disclosure Of Net Defined Benefit Liability Asset Line Items |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the beginning |  | 320 |  | 358 |
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the end |  | 260 |  | 320 | 358
Long Term Defined Benefit Commitments [Member] | Plan Assets Member | Mexico [Member] |  |  |  |  |
Disclosure Of Net Defined Benefit Liability Asset Line Items |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the beginning |  | 1,602 |  | 1,627 |
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the end |  | 1,587 |  | 1,602 | 1,627
Long Term Defined Benefit Commitments [Member] | Plan Assets Member | United States [Member] |  |  |  |  |
Disclosure Of Net Defined Benefit Liability Asset Line Items |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the beginning |  | 309 |  | 339 |
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the end |  | 287 |  | 309 | 339
Long Term Defined Benefit Commitments [Member] | Plan Assets Member | Turkey [Member] |  |  |  |  |
Disclosure Of Net Defined Benefit Liability Asset Line Items |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the beginning |  | 424 |  | 348 |
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the end |  | 339 |  | 424 | 348
Long Term Defined Benefit Commitments [Member] | Plan Assets Member | Total [Member] |  |  |  |  |
Disclosure Of Net Defined Benefit Liability Asset Line Items |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the beginning |  | 3,006 |  | 3,022 | 3,124
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Current service cost t |  | 0 |  | 0 | 0
Interest income or expense |  | 217 |  | 223 | 207
Contributions by plan participants |  | 3 |  | 4 | 5
Employer contributions |  | 103 |  | 25 | 154
Past service costs |  | 0 | [2] | 0 | 0
Remeasurements |  | (286) |  | 161 | (5)
Return on plan assets |  | (286) | [3] | 161 | (20)
ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset |  | 0 |  | 0 | 0
From changes in financial assumptions |  | 0 |  | 0 | 0
Other actuarial gain and losses |  | 0 |  | 0 | 15
Benefit payments |  | (200) |  | (169) | (169)
Settlement payments |  | 0 |  | 0 | 0
Business combinations and disposals |  | 0 |  | 0 | 0
Effect on changes in foreign exchange rates |  | (9) |  | (258) | (293)
Other effects |  | 6 |  | (1) | 0
Liability Asset Of Defined Benefit Plans at the end |  | 2,840 |  | 3,006 | 3,022
Long Term Defined Benefit Commitments [Member] | Net Benefit Liability Asset [Member] | Spain |  |  |  |  |
Disclosure Of Net Defined Benefit Liability Asset Line Items |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the beginning |  | 5,122 |  | 5,799 |
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the end |  | 4,547 |  | 5,122 | 5,799
Long Term Defined Benefit Commitments [Member] | Net Benefit Liability Asset [Member] | Mexico [Member] |  |  |  |  |
Disclosure Of Net Defined Benefit Liability Asset Line Items |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the beginning |  | 60 |  | (171) |
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the end |  | 28 |  | 60 | (171)
Long Term Defined Benefit Commitments [Member] | Net Benefit Liability Asset [Member] | United States [Member] |  |  |  |  |
Disclosure Of Net Defined Benefit Liability Asset Line Items |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the beginning |  | 51 |  | 46 |
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the end |  | 39 |  | 51 | 46
Long Term Defined Benefit Commitments [Member] | Net Benefit Liability Asset [Member] | Turkey [Member] |  |  |  |  |
Disclosure Of Net Defined Benefit Liability Asset Line Items |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the beginning |  | 96 |  | 99 |
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the end |  | 83 |  | 96 | 99
Long Term Defined Benefit Commitments [Member] | Net Benefit Liability Asset [Member] | Total [Member] |  |  |  |  |
Disclosure Of Net Defined Benefit Liability Asset Line Items |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the beginning |  | 5,378 |  | 5,829 | 6,060
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Current service cost t |  | 61 |  | 64 | 67
Interest income or expense |  | 76 |  | 68 | 92
Contributions by plan participants |  | 1 |  | 0 | 0
Employer contributions |  | (103) |  | (25) | (154)
Past service costs |  | 109 | [2] | 231 | 235
Remeasurements |  | 21 |  | 171 | 359
Return on plan assets |  | 286 | [3] | (161) | 20
ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset |  | 14 |  | 100 | 107
From changes in financial assumptions |  | (274) |  | 220 | 106
Other actuarial gain and losses |  | (5) |  | 12 | 125
Benefit payments |  | (779) |  | (861) | (883)
Settlement payments |  | 0 |  | 0 | (43)
Business combinations and disposals |  | 0 |  | 0 | 0
Effect on changes in foreign exchange rates |  | (22) |  | (19) | 11
Other effects |  | 4 |  | 0 | 84
Liability Asset Of Defined Benefit Plans at the end |  | 4,745 |  | 5,378 | 5,829
Medical Benefit Commitment [Member] | Present Value Of Defined Benefit Obligation Member | Total [Member] |  |  |  |  |
Disclosure Of Net Defined Benefit Liability Asset Line Items |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the beginning |  | 1,204 |  | 1,015 | 1,022
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Current service cost t |  | 27 |  | 26 | 24
Interest income or expense |  | 116 |  | 101 | 86
Contributions by plan participants |  | 0 |  | 0 | 0
Employer contributions |  | 0 |  | 0 | 0
Past service costs |  | (42) |  | (11) | (5)
Remeasurements |  | (210) |  | 200 | 59
Return on plan assets |  | 0 |  | 0 | 0
ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset |  | 0 |  | 83 | 110
From changes in financial assumptions |  | (182) |  | 128 | (91)
Other actuarial gain and losses |  | (28) |  | (10) | 39
Benefit payments |  | (34) |  | (35) | (33)
Settlement payments |  | 0 |  | 0 | 0
Business combinations and disposals |  | 0 |  | 0 | 0
Effect on changes in foreign exchange rates |  | 62 |  | (92) | (138)
Other effects |  | (9) |  | 0 | 0
Liability Asset Of Defined Benefit Plans at the end |  | 1,114 |  | 1,204 | 1,015
Medical Benefit Commitment [Member] | Plan Assets Member | Total [Member] |  |  |  |  |
Disclosure Of Net Defined Benefit Liability Asset Line Items |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the beginning |  | 1,114 |  | 1,113 | 1,149
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Current service cost t |  | 0 |  | 0 | 0
Interest income or expense |  | 109 |  | 112 | 97
Contributions by plan participants |  | 0 |  | 0 | 0
Employer contributions |  | 71 |  | 0 | 114
Past service costs |  | 0 |  | 0 | 0
Remeasurements |  | (164) |  | 21 | (60)
Return on plan assets |  | (164) |  | 21 | (60)
ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset |  | 0 |  | 0 | 0
From changes in financial assumptions |  | 0 |  | 0 | 0
Other actuarial gain and losses |  | 0 |  | 0 | 0
Benefit payments |  | (33) |  | (33) | (30)
Settlement payments |  | 0 |  | 0 | 0
Business combinations and disposals |  | 0 |  | 0 | 0
Effect on changes in foreign exchange rates |  | 59 |  | (100) | (156)
Other effects |  | (9) |  | 0 | 0
Liability Asset Of Defined Benefit Plans at the end |  | 1,146 |  | 1,114 | 1,113
Medical Benefit Commitment [Member] | Net Benefit Liability Asset [Member] | Total [Member] |  |  |  |  |
Disclosure Of Net Defined Benefit Liability Asset Line Items |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the beginning |  | 91 |  | (98) | (127)
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Current service cost t |  | 27 |  | 26 | 24
Interest income or expense |  | 8 |  | (11) | (11)
Contributions by plan participants |  | 0 |  | 0 | 0
Employer contributions |  | (71) |  | 0 | (114)
Past service costs |  | (42) |  | (11) | (5)
Remeasurements |  | (47) |  | 179 | 119
Return on plan assets |  | 164 |  | (21) | 60
ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset |  | 0 |  | 83 | 110
From changes in financial assumptions |  | (182) |  | 128 | (91)
Other actuarial gain and losses |  | (28) |  | (10) | 39
Benefit payments |  | (1) |  | (2) | (2)
Settlement payments |  | 0 |  | 0 | 0
Business combinations and disposals |  | 0 |  | 0 | 0
Effect on changes in foreign exchange rates |  | 3 |  | 8 | 18
Other effects |  | 0 |  | 0 | 0
Liability Asset Of Defined Benefit Plans at the end |  | (32) |  | 91 | (98)
Post Employment And Other Employee Benefit Commitments [Member] | Present Value Of Defined Benefit Obligation Member | Spain |  |  |  |  |
Disclosure Of Net Defined Benefit Liability Asset Line Items |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the beginning |  | 5,442 |  |  |
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Current service cost t |  | 4 |  |  |
Interest income or expense |  | 64 |  |  |
Contributions by plan participants |  | 0 |  |  |
Employer contributions |  | 0 |  |  |
Past service costs |  | 148 |  |  |
Remeasurements |  | (32) |  |  |
Return on plan assets |  | 0 |  |  |
ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset |  | 0 |  |  |
From changes in financial assumptions |  | 0 |  |  |
Other actuarial gain and losses |  | (32) |  |  |
Benefit payments |  | (824) |  |  |
Settlement payments |  | 0 |  |  |
Business combinations and disposals |  | 0 |  |  |
Effect on changes in foreign exchange rates |  | 0 |  |  |
Other effects |  | 5 |  |  |
Liability Asset Of Defined Benefit Plans at the end |  | 4,807 |  | 5,442 |
Post Employment And Other Employee Benefit Commitments [Member] | Present Value Of Defined Benefit Obligation Member | Mexico [Member] |  |  |  |  |
Disclosure Of Net Defined Benefit Liability Asset Line Items |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the beginning |  | 470 |  |  |
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Current service cost t |  | 5 |  |  |
Interest income or expense |  | 44 |  |  |
Contributions by plan participants |  | 0 |  |  |
Employer contributions |  | 0 |  |  |
Past service costs |  | (1) |  |  |
Remeasurements |  | 18 |  |  |
Return on plan assets |  | 0 |  |  |
ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset |  | 0 |  |  |
From changes in financial assumptions |  | (9) |  |  |
Other actuarial gain and losses |  | 27 |  |  |
Benefit payments |  | (48) |  |  |
Settlement payments |  | 0 |  |  |
Business combinations and disposals |  | 0 |  |  |
Effect on changes in foreign exchange rates |  | 25 |  |  |
Other effects |  | (2) |  |  |
Liability Asset Of Defined Benefit Plans at the end |  | 512 |  | 470 |
Post Employment And Other Employee Benefit Commitments [Member] | Present Value Of Defined Benefit Obligation Member | United States [Member] |  |  |  |  |
Disclosure Of Net Defined Benefit Liability Asset Line Items |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the beginning |  | 360 |  |  |
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Current service cost t |  | 0 |  |  |
Interest income or expense |  | 13 |  |  |
Contributions by plan participants |  | 0 |  |  |
Employer contributions |  | 0 |  |  |
Past service costs |  | 0 |  |  |
Remeasurements |  | (28) |  |  |
Return on plan assets |  | 0 |  |  |
ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset |  | (1) |  |  |
From changes in financial assumptions |  | (28) |  |  |
Other actuarial gain and losses |  | 1 |  |  |
Benefit payments |  | (35) |  |  |
Settlement payments |  | 0 |  |  |
Business combinations and disposals |  | 0 |  |  |
Effect on changes in foreign exchange rates |  | 17 |  |  |
Other effects |  | (1) |  |  |
Liability Asset Of Defined Benefit Plans at the end |  | 326 |  | 360 |
Post Employment And Other Employee Benefit Commitments [Member] | Present Value Of Defined Benefit Obligation Member | Turkey [Member] |  |  |  |  |
Disclosure Of Net Defined Benefit Liability Asset Line Items |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the beginning |  | 520 |  |  |
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Current service cost t |  | 21 |  |  |
Interest income or expense |  | 47 |  |  |
Contributions by plan participants |  | 3 |  |  |
Employer contributions |  | 0 |  |  |
Past service costs |  | 2 |  |  |
Remeasurements |  | (18) |  |  |
Return on plan assets |  | 0 |  |  |
ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset |  | 0 |  |  |
From changes in financial assumptions |  | (45) |  |  |
Other actuarial gain and losses |  | 29 |  |  |
Benefit payments |  | (21) |  |  |
Settlement payments |  | 0 |  |  |
Business combinations and disposals |  | 0 |  |  |
Effect on changes in foreign exchange rates |  | (134) |  |  |
Other effects |  | 0 |  |  |
Liability Asset Of Defined Benefit Plans at the end |  | 422 |  | 520 |
Post Employment And Other Employee Benefit Commitments [Member] | Present Value Of Defined Benefit Obligation Member | Rest of the world [Member] |  |  |  |  |
Disclosure Of Net Defined Benefit Liability Asset Line Items |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the beginning |  | 387 |  |  |
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Current service cost t |  | 4 |  |  |
Interest income or expense |  | 9 |  |  |
Contributions by plan participants |  | 1 |  |  |
Employer contributions |  | 0 |  |  |
Past service costs |  | 2 |  |  |
Remeasurements |  | 3 |  |  |
Return on plan assets |  | 0 |  |  |
ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset |  | 15 |  |  |
From changes in financial assumptions |  | (12) |  |  |
Other actuarial gain and losses |  | 0 |  |  |
Benefit payments |  | (18) |  |  |
Settlement payments |  | 0 |  |  |
Business combinations and disposals |  | 0 |  |  |
Effect on changes in foreign exchange rates |  | (2) |  |  |
Other effects |  | 17 |  |  |
Liability Asset Of Defined Benefit Plans at the end |  | 402 |  | 387 |
Post Employment And Other Employee Benefit Commitments [Member] | Plan Assets Member | Spain |  |  |  |  |
Disclosure Of Net Defined Benefit Liability Asset Line Items |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the beginning |  | 320 |  |  |
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Current service cost t |  | 0 |  |  |
Interest income or expense |  | 5 |  |  |
Contributions by plan participants |  | 0 |  |  |
Employer contributions |  | 0 |  |  |
Past service costs |  | 0 |  |  |
Remeasurements |  | (4) |  |  |
Return on plan assets |  | (4) |  |  |
ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset |  | 0 |  |  |
From changes in financial assumptions |  | 0 |  |  |
Other actuarial gain and losses |  | 0 |  |  |
Benefit payments |  | (61) |  |  |
Settlement payments |  | 0 |  |  |
Business combinations and disposals |  | 0 |  |  |
Effect on changes in foreign exchange rates |  | 0 |  |  |
Other effects |  | 0 |  |  |
Liability Asset Of Defined Benefit Plans at the end |  | 260 |  | 320 |
Post Employment And Other Employee Benefit Commitments [Member] | Plan Assets Member | Mexico [Member] |  |  |  |  |
Disclosure Of Net Defined Benefit Liability Asset Line Items |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the beginning |  | 488 |  |  |
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Current service cost t |  | 0 |  |  |
Interest income or expense |  | 46 |  |  |
Contributions by plan participants |  | 0 |  |  |
Employer contributions |  | 0 |  |  |
Past service costs |  | 0 |  |  |
Remeasurements |  | (70) |  |  |
Return on plan assets |  | (70) |  |  |
ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset |  | 0 |  |  |
From changes in financial assumptions |  | 0 |  |  |
Other actuarial gain and losses |  | 0 |  |  |
Benefit payments |  | (47) |  |  |
Settlement payments |  | 0 |  |  |
Business combinations and disposals |  | 0 |  |  |
Effect on changes in foreign exchange rates |  | 26 |  |  |
Other effects |  | (1) |  |  |
Liability Asset Of Defined Benefit Plans at the end |  | 441 |  | 488 |
Post Employment And Other Employee Benefit Commitments [Member] | Plan Assets Member | United States [Member] |  |  |  |  |
Disclosure Of Net Defined Benefit Liability Asset Line Items |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the beginning |  | 309 |  |  |
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Current service cost t |  | 0 |  |  |
Interest income or expense |  | 11 |  |  |
Contributions by plan participants |  | 0 |  |  |
Employer contributions |  | 2 |  |  |
Past service costs |  | 0 |  |  |
Remeasurements |  | (17) |  |  |
Return on plan assets |  | (17) |  |  |
ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset |  | 0 |  |  |
From changes in financial assumptions |  | 0 |  |  |
Other actuarial gain and losses |  | 0 |  |  |
Benefit payments |  | (33) |  |  |
Settlement payments |  | 0 |  |  |
Business combinations and disposals |  | 0 |  |  |
Effect on changes in foreign exchange rates |  | 15 |  |  |
Other effects |  | 0 |  |  |
Liability Asset Of Defined Benefit Plans at the end |  | 287 |  | 309 |
Post Employment And Other Employee Benefit Commitments [Member] | Plan Assets Member | Turkey [Member] |  |  |  |  |
Disclosure Of Net Defined Benefit Liability Asset Line Items |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the beginning |  | 424 |  |  |
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Current service cost t |  | 0 |  |  |
Interest income or expense |  | 39 |  |  |
Contributions by plan participants |  | 3 |  |  |
Employer contributions |  | 13 |  |  |
Past service costs |  | 0 |  |  |
Remeasurements |  | (21) |  |  |
Return on plan assets |  | (21) |  |  |
ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset |  | 0 |  |  |
From changes in financial assumptions |  | 0 |  |  |
Other actuarial gain and losses |  | 0 |  |  |
Benefit payments |  | (10) |  |  |
Settlement payments |  | 0 |  |  |
Business combinations and disposals |  | 0 |  |  |
Effect on changes in foreign exchange rates |  | (108) |  |  |
Other effects |  | 0 |  |  |
Liability Asset Of Defined Benefit Plans at the end |  | 339 |  | 424 |
Post Employment And Other Employee Benefit Commitments [Member] | Plan Assets Member | Rest of the world [Member] |  |  |  |  |
Disclosure Of Net Defined Benefit Liability Asset Line Items |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the beginning |  | 351 |  |  |
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Current service cost t |  | 0 |  |  |
Interest income or expense |  | 7 |  |  |
Contributions by plan participants |  | 1 |  |  |
Employer contributions |  | 18 |  |  |
Past service costs |  | 0 |  |  |
Remeasurements |  | (11) |  |  |
Return on plan assets |  | (11) |  |  |
ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset |  | 0 |  |  |
From changes in financial assumptions |  | 0 |  |  |
Other actuarial gain and losses |  | 0 |  |  |
Benefit payments |  | (15) |  |  |
Settlement payments |  | 0 |  |  |
Business combinations and disposals |  | 0 |  |  |
Effect on changes in foreign exchange rates |  | (1) |  |  |
Other effects |  | 17 |  |  |
Liability Asset Of Defined Benefit Plans at the end |  | 366 |  | 351 |
Post Employment And Other Employee Benefit Commitments [Member] | Net Benefit Liability Asset [Member] | Spain |  |  |  |  |
Disclosure Of Net Defined Benefit Liability Asset Line Items |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the beginning |  | 5,122 |  | 5,799 | 6,109
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Current service cost t |  | 4 |  | 4 | 10
Interest income or expense |  | 59 |  | 73 | 98
Contributions by plan participants |  | 0 |  | 0 | 0
Employer contributions |  | 0 |  | 0 | 0
Past service costs |  | 148 |  | 235 | 240
Remeasurements |  | (28) |  | (67) | 188
Return on plan assets |  | 4 |  | (21) | (35)
ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset |  | 0 |  | 0 | 0
From changes in financial assumptions |  | 0 |  | (33) | 192
Other actuarial gain and losses |  | (32) |  | (13) | 31
Benefit payments |  | (763) |  | (842) | (867)
Settlement payments |  | 0 |  | 0 | (43)
Business combinations and disposals |  | 0 |  | 0 | 0
Effect on changes in foreign exchange rates |  | 0 |  | 0 | 0
Other effects |  | 5 |  | 2 | 63
Liability Asset Of Defined Benefit Plans at the end |  | 4,547 |  | 5,122 | 5,799
Post Employment And Other Employee Benefit Commitments [Member] | Net Benefit Liability Asset [Member] | Mexico [Member] |  |  |  |  |
Disclosure Of Net Defined Benefit Liability Asset Line Items |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the beginning |  | (18) |  | (59) | (79)
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Current service cost t |  | 5 |  | 5 | 6
Interest income or expense |  | (2) |  | (6) | (7)
Contributions by plan participants |  | 0 |  | 0 | 0
Employer contributions |  | 0 |  | (1) | (14)
Past service costs |  | (1) |  | 1 | 1
Remeasurements |  | 88 |  | 38 | 23
Return on plan assets |  | 70 |  | (10) | 23
ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset |  | 0 |  | 22 | 2
From changes in financial assumptions |  | (9) |  | 18 | (22)
Other actuarial gain and losses |  | 27 |  | 7 | 19
Benefit payments |  | 0 |  | (1) | 0
Settlement payments |  | 0 |  | 0 | 0
Business combinations and disposals |  | 0 |  | 0 | 0
Effect on changes in foreign exchange rates |  | (1) |  | 5 | 10
Other effects |  | 0 |  | 0 | 0
Liability Asset Of Defined Benefit Plans at the end |  | 71 |  | (18) | (59)
Post Employment And Other Employee Benefit Commitments [Member] | Net Benefit Liability Asset [Member] | United States [Member] |  |  |  |  |
Disclosure Of Net Defined Benefit Liability Asset Line Items |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the beginning |  | 51 |  | 46 | 35
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Current service cost t |  | 0 |  | 3 | 4
Interest income or expense |  | 2 |  | 1 | 1
Contributions by plan participants |  | 0 |  | 0 | 0
Employer contributions |  | (2) |  | 0 | (1)
Past service costs |  | 0 |  | 0 | 0
Remeasurements |  | (11) |  | 9 | 10
Return on plan assets |  | 17 |  | (11) | 3
ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset |  | (1) |  | (2) | (5)
From changes in financial assumptions |  | (28) |  | 22 | 13
Other actuarial gain and losses |  | 1 |  | 0 | (1)
Benefit payments |  | (2) |  | (2) | (3)
Settlement payments |  | 0 |  | 0 | 0
Business combinations and disposals |  | 0 |  | 0 | 0
Effect on changes in foreign exchange rates |  | 2 |  | (5) | 2
Other effects |  | (1) |  | (1) | (3)
Liability Asset Of Defined Benefit Plans at the end |  | 39 |  | 51 | 46
Post Employment And Other Employee Benefit Commitments [Member] | Net Benefit Liability Asset [Member] | Turkey [Member] |  |  |  |  |
Disclosure Of Net Defined Benefit Liability Asset Line Items |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the beginning |  | 96 |  | 99 | 97
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Current service cost t |  | 21 |  | 21 | 22
Interest income or expense |  | 8 |  | 9 | 8
Contributions by plan participants |  | 0 |  | 0 | 0
Employer contributions |  | (13) |  | (16) | (17)
Past service costs |  | 2 |  | 4 | 4
Remeasurements |  | 3 |  | 12 | 8
Return on plan assets |  | 21 |  | (101) | (23)
ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset |  | 0 |  | 0 | 0
From changes in financial assumptions |  | (45) |  | 81 | (23)
Other actuarial gain and losses |  | 29 |  | 32 | 54
Benefit payments |  | (11) |  | (11) | (9)
Settlement payments |  | 0 |  | 0 | 0
Business combinations and disposals |  | 0 |  | 0 | 0
Effect on changes in foreign exchange rates |  | (26) |  | (21) | (15)
Other effects |  | 0 |  | 0 | 0
Liability Asset Of Defined Benefit Plans at the end |  | 83 |  | 96 | 99
Post Employment And Other Employee Benefit Commitments [Member] | Net Benefit Liability Asset [Member] | Rest of the world [Member] |  |  |  |  |
Disclosure Of Net Defined Benefit Liability Asset Line Items |  |  |  |  |
Liability Asset Of Defined Benefit Plans at the beginning |  | 36 |  | 42 | 24
Changes In Net Defined Benefit Liability Asset Abstract |  |  |  |  |
Current service cost t |  | 4 |  | 5 | 5
Interest income or expense |  | 2 |  | 2 | 2
Contributions by plan participants |  | 1 |  | 0 | 0
Employer contributions |  | (18) |  | (8) | (9)
Past service costs |  | 2 |  | 3 | (4)
Remeasurements |  | 14 |  | (1) | 11
Return on plan assets |  | 11 |  | 2 | (8)
ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset |  | 15 |  | (3) | (1)
From changes in financial assumptions |  | (12) |  | 4 | 37
Other actuarial gain and losses |  | 0 |  | (4) | (17)
Benefit payments |  | (3) |  | (3) | (2)
Settlement payments |  | 0 |  | 0 | 0
Business combinations and disposals |  | 0 |  | 0 | 0
Effect on changes in foreign exchange rates |  | (1) |  | (5) | (4)
Other effects |  | 0 |  | (1) | 20
Liability Asset Of Defined Benefit Plans at the end |  | € 35 |  | € 36 | € 42
[1] | (*) Actuarial losses (gains) on remeasurement of the net defined benefit liability relating to early retirements in Spain and other long-term employee benefits that are charged to the income statements (see Note 2.2.12).
[2] | (1) In cluding gains and losses arising from settleme nts.
[3] | (2) Excluding interest, which is recorded under "Interest income or expense".

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