| Decrease (increase) through actuarial gains (losses), defined benefit obligation, at present value | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Increase (decrease) through actuarial losses (gains), defined benefit obligation, at present value | en | http://www.xbrl.org/2009/role/negatedLabel | http://www.xbrl.org/2003/role/link |
| The decrease (increase) in the present value of a defined benefit obligation resulting from actuarial gains (losses). [Refer: Defined benefit obligation, at present value] | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |