XML 55 R44.htm IDEA: XBRL DOCUMENT
v3.19.1

7. Cash and cash equivalents (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2018
Cash And Cash Equivalents |
Cash and cash equivalents |
| December 31, 2018 | December 31, 2017
Cash and banks | 151,558 | 171,951
Cash equivalents | 2,877,633 | 2,111,096
| 3,029,191 | 2,283,047

X
- References No definition available. + Details
Name: | SBS_CashAndCashEquivalentsTablesAbstract
Namespace Prefix: | SBS_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | SBS_SummaryOfCashAndCashEquivalentsTableTextBlock
Namespace Prefix: | SBS_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration