| Receivables from contracts with customers | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Total receivables from contracts with customers | en | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |
| Receivables from contracts with customers at beginning of period | en | http://www.xbrl.org/2003/role/periodStartLabel | http://www.xbrl.org/2003/role/link |
| Receivables from contracts with customers at end of period | en | http://www.xbrl.org/2003/role/periodEndLabel | http://www.xbrl.org/2003/role/link |