| 新幹線鉄道大規模改修引当金の増減額(△は減少) | ja | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| 新幹線鉄道大規模改修引当金の増減額(△は減少)、営業活動によるキャッシュ・フロー、鉄道事業 | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Increase (decrease) in provision for large scale renovation of Shinkansen infrastructure | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Increase (decrease) in provision for large scale renovation of Shinkansen infrastructure-OpeCF-RWY | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |