| Decrease (increase) through curtailments, defined benefit obligation, at present value | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Increase (decrease) through curtailments, 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 curtailments. [Refer: Defined benefit obligation, at present value] | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |