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Insurance technical provisions and pension plans (Details 10) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Amount estimated for the claims:    
Estimate of claims on the reporting date (2017) R$ 5,879,921 R$ 6,327,615
Liquid outstanding claims for reinsurance 4,190,074 R$ 4,034,622
Year claims were notified - Up to 2007    
Amount estimated for the claims:    
Estimate of claims on the reporting date (2017) 5,086,824  
Payments of claims (5,064,293)  
Liquid outstanding claims for reinsurance 22,531  
Year claims were notified - Up to 2007 | In the year after notification    
Amount estimated for the claims:    
Claims reported by policyholders 4,482,979  
Year claims were notified - Up to 2007 | One year after notification    
Amount estimated for the claims:    
Claims reported by policyholders 4,679,108  
Year claims were notified - Up to 2007 | Two years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 4,711,861  
Year claims were notified - Up to 2007 | Three years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 4,783,290  
Year claims were notified - Up to 2007 | Four years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 4,845,834  
Year claims were notified - Up to 2007 | Five years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 4,902,275  
Year claims were notified - Up to 2007 | Six years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 4,956,618  
Year claims were notified - Up to 2007 | Seven years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 4,982,993  
Year claims were notified - Up to 2007 | Eight years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 5,028,742  
Year claims were notified - Up to 2007 | Nine years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 5,074,360  
Year claims were notified - Up to 2007 | Ten years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 5,086,824  
Year claims were notified - 2008    
Amount estimated for the claims:    
Estimate of claims on the reporting date (2017) 1,149,106  
Payments of claims (1,022,199)  
Liquid outstanding claims for reinsurance 126,907  
Year claims were notified - 2008 | In the year after notification    
Amount estimated for the claims:    
Claims reported by policyholders 1,152,371  
Year claims were notified - 2008 | One year after notification    
Amount estimated for the claims:    
Claims reported by policyholders 1,108,270  
Year claims were notified - 2008 | Two years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 1,088,069  
Year claims were notified - 2008 | Three years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 1,094,795  
Year claims were notified - 2008 | Four years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 1,102,364  
Year claims were notified - 2008 | Five years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 1,102,595  
Year claims were notified - 2008 | Six years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 1,127,609  
Year claims were notified - 2008 | Seven years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 1,140,708  
Year claims were notified - 2008 | Eight years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 1,158,436  
Year claims were notified - 2008 | Nine years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 1,149,106  
Year claims were notified - 2008 | Ten years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2009    
Amount estimated for the claims:    
Estimate of claims on the reporting date (2017) 2,057,911  
Payments of claims (2,042,673)  
Liquid outstanding claims for reinsurance 15,238  
Year claims were notified - 2009 | In the year after notification    
Amount estimated for the claims:    
Claims reported by policyholders 2,058,559  
Year claims were notified - 2009 | One year after notification    
Amount estimated for the claims:    
Claims reported by policyholders 2,037,365  
Year claims were notified - 2009 | Two years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 2,018,329  
Year claims were notified - 2009 | Three years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 2,015,921  
Year claims were notified - 2009 | Four years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 2,046,000  
Year claims were notified - 2009 | Five years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 2,044,644  
Year claims were notified - 2009 | Six years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 2,056,612  
Year claims were notified - 2009 | Seven years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 2,072,169  
Year claims were notified - 2009 | Eight years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 2,057,911  
Year claims were notified - 2009 | Nine years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2009 | Ten years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2010    
Amount estimated for the claims:    
Estimate of claims on the reporting date (2017) 2,419,614  
Payments of claims (2,390,739)  
Liquid outstanding claims for reinsurance 28,875  
Year claims were notified - 2010 | In the year after notification    
Amount estimated for the claims:    
Claims reported by policyholders 2,414,674  
Year claims were notified - 2010 | One year after notification    
Amount estimated for the claims:    
Claims reported by policyholders 2,394,609  
Year claims were notified - 2010 | Two years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 2,387,075  
Year claims were notified - 2010 | Three years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 2,403,020  
Year claims were notified - 2010 | Four years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 2,418,649  
Year claims were notified - 2010 | Five years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 2,428,252  
Year claims were notified - 2010 | Six years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 2,431,363  
Year claims were notified - 2010 | Seven years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 2,419,614  
Year claims were notified - 2010 | Eight years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2010 | Nine years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2010 | Ten years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2011    
Amount estimated for the claims:    
Estimate of claims on the reporting date (2017) 2,621,044  
Payments of claims (2,586,371)  
Liquid outstanding claims for reinsurance 34,673  
Year claims were notified - 2011 | In the year after notification    
Amount estimated for the claims:    
Claims reported by policyholders 2,647,298  
Year claims were notified - 2011 | One year after notification    
Amount estimated for the claims:    
Claims reported by policyholders 2,626,356  
Year claims were notified - 2011 | Two years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 2,604,738  
Year claims were notified - 2011 | Three years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 2,604,061  
Year claims were notified - 2011 | Four years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 2,600,194  
Year claims were notified - 2011 | Five years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 2,625,442  
Year claims were notified - 2011 | Six years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 2,621,044  
Year claims were notified - 2011 | Seven years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2011 | Eight years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2011 | Nine years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2011 | Ten years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2012    
Amount estimated for the claims:    
Estimate of claims on the reporting date (2017) 2,888,296  
Payments of claims (2,835,738)  
Liquid outstanding claims for reinsurance 52,558  
Year claims were notified - 2012 | In the year after notification    
Amount estimated for the claims:    
Claims reported by policyholders 3,134,409  
Year claims were notified - 2012 | One year after notification    
Amount estimated for the claims:    
Claims reported by policyholders 3,035,716  
Year claims were notified - 2012 | Two years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 3,021,698  
Year claims were notified - 2012 | Three years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 3,041,626  
Year claims were notified - 2012 | Four years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 3,071,989  
Year claims were notified - 2012 | Five years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 2,888,296  
Year claims were notified - 2012 | Six years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2012 | Seven years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2012 | Eight years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2012 | Nine years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2012 | Ten years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2013    
Amount estimated for the claims:    
Estimate of claims on the reporting date (2017) 2,813,496  
Payments of claims (2,753,035)  
Liquid outstanding claims for reinsurance 604,613,134,409  
Year claims were notified - 2013 | In the year after notification    
Amount estimated for the claims:    
Claims reported by policyholders 3,020,829  
Year claims were notified - 2013 | One year after notification    
Amount estimated for the claims:    
Claims reported by policyholders 2,848,361  
Year claims were notified - 2013 | Two years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 2,809,942  
Year claims were notified - 2013 | Three years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 2,839,210  
Year claims were notified - 2013 | Four years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 2,813,496  
Year claims were notified - 2013 | Five years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2013 | Six years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2013 | Seven years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2013 | Eight years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2013 | Nine years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2013 | Ten years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2014    
Amount estimated for the claims:    
Estimate of claims on the reporting date (2017) 3,436,234  
Payments of claims (3,355,681)  
Liquid outstanding claims for reinsurance 80,553  
Year claims were notified - 2014 | In the year after notification    
Amount estimated for the claims:    
Claims reported by policyholders 3,708,479  
Year claims were notified - 2014 | One year after notification    
Amount estimated for the claims:    
Claims reported by policyholders 3,456,642  
Year claims were notified - 2014 | Two years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 3,464,389  
Year claims were notified - 2014 | Three years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 3,436,234  
Year claims were notified - 2014 | Four years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2014 | Five years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2014 | Six years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2014 | Seven years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2014 | Eight years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2014 | Nine years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2014 | Ten years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2015    
Amount estimated for the claims:    
Estimate of claims on the reporting date (2017) 3,989,904  
Payments of claims (3,879,707)  
Liquid outstanding claims for reinsurance 110,197  
Year claims were notified - 2015 | In the year after notification    
Amount estimated for the claims:    
Claims reported by policyholders 4,160,984  
Year claims were notified - 2015 | One year after notification    
Amount estimated for the claims:    
Claims reported by policyholders 4,028,967  
Year claims were notified - 2015 | Two years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 3,989,904  
Year claims were notified - 2015 | Three years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2015 | Four years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2015 | Five years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2015 | Six years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2015 | Seven years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2015 | Eight years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2015 | Nine years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2015 | Ten years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2016    
Amount estimated for the claims:    
Estimate of claims on the reporting date (2017) 3,640,897  
Payments of claims (3,491,476)  
Liquid outstanding claims for reinsurance 149,421  
Year claims were notified - 2016 | In the year after notification    
Amount estimated for the claims:    
Claims reported by policyholders 3,821,255  
Year claims were notified - 2016 | One year after notification    
Amount estimated for the claims:    
Claims reported by policyholders 3,640,897  
Year claims were notified - 2016 | Two years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2016 | Three years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2016 | Four years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2016 | Five years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2016 | Six years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2016 | Seven years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2016 | Eight years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2016 | Nine years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2016 | Ten years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2017    
Amount estimated for the claims:    
Estimate of claims on the reporting date (2017) 3,481,275  
Payments of claims (2,766,457)  
Liquid outstanding claims for reinsurance 714,818  
Year claims were notified - 2017 | In the year after notification    
Amount estimated for the claims:    
Claims reported by policyholders 3,481,275  
Year claims were notified - 2017 | One year after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2017 | Two years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2017 | Three years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2017 | Four years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2017 | Five years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2017 | Six years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2017 | Seven years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - 2017 | Eight years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - Total    
Amount estimated for the claims:    
Estimate of claims on the reporting date (2017) 33,584,601  
Payments of claims (32,188,369)  
Liquid outstanding claims for reinsurance 1,396,232  
Year claims were notified - Total | In the year after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - Total | One year after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - Total | Two years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - Total | Three years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - Total | Four years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - Total | Five years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - Total | Six years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - Total | Seven years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - Total | Eight years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - Total | Nine years after notification    
Amount estimated for the claims:    
Claims reported by policyholders 0  
Year claims were notified - Total | Ten years after notification    
Amount estimated for the claims:    
Claims reported by policyholders R$ 0