| Proceeds from (Payments for) Deposits Applied to Debt Retirements | en-US | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Proceeds from (Payments for) Deposits Applied to Debt Retirements, Total | en-US | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |
| The net cash inflow or outflow from payments to deposit account and application of deposits to retire or pay down debt during the period. | en-US | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |