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20. Employees benefits (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
SummaryOfEmployeeBenefitsLineItems [Line Items]
Present value of defined benefit obligations	R$ 2,319,841	R$ 2,465,721	R$ 2,252,204
Fair value of the plan assets	1,931,380	1,712,551	1,586,930
Net liabilities recognized for defined benefit obligations	388,461	753,170
Liability as per statement of financial position – pension obligations	2,932,338	3,265,250
Funded plan
SummaryOfEmployeeBenefitsLineItems [Line Items]
Present value of defined benefit obligations	2,319,841	2,465,721
Fair value of the plan assets	(1,931,380)	(1,712,551)
Net liabilities recognized for defined benefit obligations	388,461	753,170
Unfunded plan
SummaryOfEmployeeBenefitsLineItems [Line Items]
Present value of defined benefit obligations	2,543,877	2,512,080	R$ 2,166,942
Net liabilities recognized for defined benefit obligations	R$ 2,543,877	R$ 2,512,080

X

- Definition

Defined Benefit The Company makes contributions to defined benefit plans on a contractual basis and sponsored thereby, managed by Fundação Sabesp de Seguridade Social (“Sabesprev”), a supplementary private pension closely-held entity. The regular contributions comprise the net administrative expenses and are recognized in the income statement for the period. Liabilities from defined benefit pension plan obligations correspond to the present value of the defined benefit obligation at the end of the reporting period, less the fair value of the plan’s assets. The defined benefit obligation (G1) and (G0) are calculated on an annual basis by independent actuaries, using the projected unit credit method. The estimated future cash outflows is discounted to its present value, using the interest rates of Government bonds with maturities that approximate the maturity of the related liability. Defined Contribution The Company makes contributions to defined contribution plans (Sabesprev Mais) on a contractual basis and sponsored thereby, managed by Sabesprev, a supplementary private pension closely-held entity that provides postemployment benefits to its employees. A defined contribution plan is a pension plan according to which the Company makes fixed contributions to a separate entity. The Company has no obligation of making contributions if the fund has no sufficient funds to pay to all employees the benefits related to employee’s services in current and previous period.

+ References

No definition available.

+ Details

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X

- References

No definition available.

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X

- Definition

The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2017-01-01
-Paragraph 57
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard
-URIDate 2017-03-09

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X

- Definition

The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2017-01-01
-Paragraph 57
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard
-URIDate 2017-03-09

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X

- Definition

The present value of the defined benefit obligation, less the fair value of the plan assets (if any). [Refer: Plan assets [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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