| Amount of consolidated variable interest entity's (VIE) assets that do not have to be used to settle obligations of VIE. | en-US | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Variable Interest Entity, Consolidated, Assets, Not Pledged (Deprecated 2020-01-31) | en-US | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Variable Interest Entity, Consolidated, Assets, Not Pledged, Total (Deprecated 2020-01-31) | en-US | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |