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Statements of Cash Flows - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flow from operating activities      
Profit before income tax and social contribution R$ 3,503,614 R$ 4,129,054 R$ 587,529
Adjustments for:      
Depreciation and amortization 1,301,897 1,146,626 1,074,032
Residual value of property, plant and equipment and intangible assets written-off 24,935 15,168 52,040
Bad debt expense 82,681 90,488 2,420
Provisions and inflation adjustment 185,080 276,654 (4,706)
Pension plan liabilities - early reduction (curtailment) 0 (334,152) 0
Interest calculated on borrowings and financing payable 426,781 449,470 474,056
Inflation adjustment and exchange gains (losses) on borrowings and financing 159,087 (969,430) 2,163,754
Interest and inflation adjustment on liabilities 25,751 24,297 27,168
Interest and inflation adjustment on assets (31,619) (80,675) (130,762)
Finance charges from customers (193,683) (207,789) (125,966)
Margin of fair value on intangible assets arising from concession (70,335) (81,513) (72,908)
Provision for Consent Decree (TAC) 72,933 89,083 (15,601)
Equity in results of investments in affiliates (5,760) (4,740) (2,597)
Provision from São Paulo agreement 0 0 11,252
Provision for pension plan - Sabesprev Mais 0 235 8,349
Pension obligations 304,500 377,886 352,710
Other adjustments 92,461 24,412 (6,103)
GESP Agreement 0 0 (696,283)
Total adustments 5,878,323 4,945,074 3,698,384
Changes in assets      
Trade receivables (42,194) (34,665) (111,738)
Accounts receivable from related parties 51,594 (3,163) (2,818)
Inventories (27,633) 7,156 (550)
Recoverable taxes (233,952) 35,195 70,940
Escrow deposits (32,200) 33,232 35,083
Other receivables 8,312 144,920 (9,785)
Changes in liabilities      
Trade payables and contractors (180,353) 6,371 (18,314)
Services payable (51,779) 72,775 57,054
Accrued payroll and related taxes 56,841 21,240 (24,394)
Taxes and contributions payable 15,983 (90,325) 35,947
Deferred Cofins/PASEP (7,889) 5,150 3,570
Provisions (279,951) (185,793) (133,427)
Pension obligations (228,282) (201,736) (182,514)
Other liabilities (16,741) 17,842 (47,607)
Cash generated from operations 4,910,079 4,773,273 3,369,831
Interest paid (676,087) (739,944) (710,688)
Income tax and social contribution paid (932,110) (1,029,737) (17,743)
Net cash generated from operating activities 3,301,882 3,003,592 2,641,400
Cash flows from investing activities      
Acquisition of intangible (1,957,780) (2,108,167) (2,397,352)
Restricted cash 5,256 5,078 (9,406)
Investment increase 0 0 (2,540)
Purchase of property, plant and equipment (18,920) (27,631) (54,794)
Dividends received 0 0 4,612
Net cash used in investing activities (1,971,444) (2,130,720) (2,459,480)
Borrowings and financing      
Proceeds from loans 1,007,572 1,250,524 1,303,296
Payment of loans (1,098,558) (1,535,312) (1,292,322)
Payment of interest on capital (765,933) (139,399) (202,115)
Public-Private Partnership - PPP (31,758) (30,498) (23,799)
Program Contract Commitments (44,935) (171,180) (50,757)
Net cash generated by (used in) financing activities (933,612) (625,865) (265,697)
Increase/(decrease) in cash and cash equivalents 396,826 247,007 (83,777)
Represented by :      
Cash and cash equivalents at the beginning of the year 1,886,221 1,639,214 1,722,991
Cash and cash equivalents at the end of the year 2,283,047 1,886,221 1,639,214
Increase/(decrease) in cash and cash equivalents R$ 396,826 R$ 247,007 R$ (83,777)