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Note 32 - Capital Base and Capital Management - Shareholder Equity (Details) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Capital Base And Capital Management |  |
CET 1 phased in capital at a consolidated level | 8.438% |
CET 1 phased in capital at a Individual level | 7.875% |
Phased in total capital ratio at the consolidated level | 11.938% |
Phased in total capital ratio at the individual level Line Items |  |
Phased in total capital ratio at the individual level | 11.375% |
D-SIB buffer | 0.75% |
Equity Tier 1 | 11.7% |
Equity tier 1 decrease to respect the last exercise | 49 basis points |
Deductions due to the regulatory | 80% | 60%
Impact of the deductions due to the regulatory | -56 basis points |
Minimum CET 1 capital ratio required under Pillar 1 [Member] |  |
Phased in total capital ratio at the individual level Line Items |  |
Phased in total capital ratio at the individual level | 4.5% |
Pillar 1 Additional Tier 1 capital requirements [Member] |  |
Phased in total capital ratio at the individual level Line Items |  |
Phased in total capital ratio at the individual level | 1.5% |
Pillar 1 Tier 2 capital requirements [Member] |  |
Phased in total capital ratio at the individual level Line Items |  |
Phased in total capital ratio at the individual level | 2% |
Pillar 2 CET 1 capital requirements [Member] |  |
Phased in total capital ratio at the individual level Line Items |  |
Phased in total capital ratio at the individual level | 1.5% |
Capital conservation buffer [Member] |  |
Phased in total capital ratio at the individual level Line Items |  |
Phased in total capital ratio at the individual level | 1.875% CET1 phased-in |
Other Systemic Important Institution buffer [Member] |  |
Phased in total capital ratio at the individual level Line Items |  |
Phased in total capital ratio at the individual level | 0.563% CET1 phased-in |

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- Definition The total Cet1 phased-in capital at a consolidated level. + References No definition available. + Details
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