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Risk Management (Details 22) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Undiscounted cash flows for derivatives    
Differential of swaps payable R$ 13,276,763 R$ 11,021,775
Non-deliverable forwards 512,005 2,739,946
Purchased 284,403 1,155,258
Sold 227,602 1,584,688
Premiums of options 965,425 262,658
Adjustment payables - future 155,305 19,164
Total of derivative liabilities 14,909,498 14,043,543
1 to 30 days    
Undiscounted cash flows for derivatives    
Differential of swaps payable 279,134 1,426,666
Non-deliverable forwards 201,115 1,772,919
Purchased 73,599 212,953
Sold 127,516 1,559,966
Premiums of options 551,220 150,945
Adjustment payables - future 155,305 19,164
Total of derivative liabilities 1,186,774 3,369,694
31 to 180 days    
Undiscounted cash flows for derivatives    
Differential of swaps payable 125,468 183,769
Non-deliverable forwards 95,761 264,887
Purchased 53,513 256,669
Sold 42,248 8,218
Premiums of options 13,510 28,342
Adjustment payables - future 0 0
Total of derivative liabilities 234,739 476,998
181 to 360 days    
Undiscounted cash flows for derivatives    
Differential of swaps payable 536,406 546,569
Non-deliverable forwards 147,710 542,923
Purchased 90,914 534,800
Sold 56,796 8,123
Premiums of options 34,443 40,154
Adjustment payables - future 0 0
Total of derivative liabilities 718,559 1,129,646
From 1 to 5 years    
Undiscounted cash flows for derivatives    
Differential of swaps payable 12,169,717 8,695,486
Non-deliverable forwards 66,682 158,670
Purchased 65,640 150,289
Sold 1,042 8,381
Premiums of options 63,052 43,217
Adjustment payables - future 0 0
Total of derivative liabilities 12,299,451 8,897,373
More than 5 years    
Undiscounted cash flows for derivatives    
Differential of swaps payable 166,038 169,285
Non-deliverable forwards 737 547
Purchased 737 547
Sold 0 0
Premiums of options 303,200 0
Adjustment payables - future 0 0
Total of derivative liabilities R$ 469,975 R$ 169,832