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Consolidated statement of cash flows - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities      
Profit before income taxes R$ 6,250,876 R$ 1,990,961 R$ 3,661,948
Adjustments for:      
Depreciation and amortization 2,504,384 2,340,854 2,287,877
Lease and concession (reversal) provision (379,636)
Interest in earnings of associates (130,225) (28,801) (1,231)
Interest in earnings of joint ventures (4,590,631) (583,001) (1,131,406)
(Gain) loss on disposed assets (7,295) (30,610) 36,045
Share-based payment 53,131 272,692 101,283
Legal proceedings provision 263,945 27,437 102,811
Interest and exchange, net 2,911,179 2,111,772 2,125,655
Sector financial assets and liabilities, net 246,100 337,620
Deferred revenue (6,325) (8,271)
Provisions for employee benefits 358,053 161,042 229,812
Allowance for expected credit losses (2,813) 32,098 6,630
Disposal of credit rights 68,311 (410,000)
Recovering tax credits (648,315) (132,399) (165,398)
Loss in energy derivative operations 58,701
Change in fair value of investment property (17,116)
Gain in a bargain purchase (416,268)
Other (23,731) 436,260 (109,423)
Cash flows from operating activities before changes in working capital 6,809,975 6,618,275 6,726,332
Changes in:      
Trade receivables (404,016) 67,291 (145,933)
Inventories (245,174) (117,166) (90,880)
Other current tax, net 155,712 74,949 179,622
Income tax (950,401) (868,234) (407,477)
Related parties, net (111,149) 572,601 22,827
Trade payables 591,975 167,019 383,459
Employee benefits (150,087) (170,133) (198,312)
Provision for legal proceedings (131,260) (212,699) (187,292)
Other financial liabilities 50,856 (91,935) 26,525
Judicial deposits (58,608) (23,493) (62,727)
Discontinued operation (17,615)
Cash received (paid) on disposal of credit rights (31,857) 410,000
Tax losses acquired (208,118)
Post-employment benefits (34,004) (37,444) (39,387)
Other assets and liabilities, net (238,320) (301,931)
Concessions payable (168,510) (51,947) (474)
Changes in working capital (1,662,784) (961,368) (429,595)
Net cash from operating activities 5,147,191 5,656,907 6,296,737
Cash flows from investing activities      
Capital contribution in associates (417,216) (1,142) (31,113)
Acquisition of subsidiary, net of cash acquired (592,733) (94,631) (9,837)
(Purchase) sale of marketable securities (514,459) (483,574) 1,230,431
Restricted cash 26,313 124,330 (31,439)
Dividends received from associates 16,426 13,165 17,690
Dividends received from joint ventures 819,729 1,852 1,462,625
Other financial assets (14,168) 11 (17,022)
Acquisition of property, plant and equipment, intangible assets and contract assets (4,774,839) (4,034,688) (2,762,937)
Net cash from sale of discontinued operations 432
Acquisition of associates shares (51,299)
Cash received on sale of fixed assets, and intangible assets 3,090 3,045 10,578
Other 1,025 (194)
Net cash used in investing activities (5,446,832) (4,523,125) (130,592)
Cash flows from financing activities      
Loans, borrowings and debentures raised 12,548,547 10,336,257 9,352,123
Repayment of principal on loans, borrowings and debentures (9,925,067) (3,397,060) (4,422,026)
Payment of interest on loans, borrowings and debentures (2,321,868) (1,782,976) (1,384,184)
Payment of derivative financial instruments (647,168) (61,716) (126,986)
Receipt of derivative financial instruments 4,325,918 1,383,411 251,545
Payment of non-debt related derivative financial instruments (227,012) (101,461)
Receipt of non-debt related derivative financial instruments 197,679 106,519
Repayment of principal on lease liabilities (461,040) (5,424,917) (423,283)
Payment of interest on leases (165,301) (500,922) (249,325)
Cash contribution from non-controlling interest 2,252,306 4,397,772 453,082
Payments to redeem entity’s shares and acquisition of treasury shares (26,101) (495,048) (1,141,302)
Transactions with non-controlling interests 69,155 65,478 1,192
Acquisition of non-controlling interests (698,147) (269,977) (3,086,642)
Dividends paid (2,558,886) (546,302) (738,152)
Discontinued operation 1,543
Payment of share-based compensation (45,024) (22,804) (45,961)
Other 1,397
Net cash from (used in) financing activities 2,319,388 3,686,254 (1,558,376)
Net increase in cash and cash equivalents 2,019,747 4,820,036 4,607,769
Cash and cash equivalents at beginning of year 13,642,918 8,472,274 3,621,798
Effect of foreign exchange rate changes 511,465 350,608 242,707
Cash and cash equivalents at end of year 16,174,130 13,642,918 8,472,274
Additional information      
Income tax paid R$ 462,120 R$ 592,243 R$ 287,451