You can Use tow items, each item with a click method
like :
<ion-list *ngSwitchCase="'todo'" >
<ion-item *ngFor="let intervention of ( listInterventions | interventionFilter : ['todo'])">
<ion-row>
<ion-col width-80 >
<ion-item (click)="detail(intervention)">
<div [style.color]="getPriorityStyle(intervention.int_priority)">{{getPriorityName(intervention.int_priority)}}</div>
{{intervention.int_nom}} <br/>
{{(intervention.int_client != null)? intervention.int_client.c_nom : "aucun"}}<br/>
{{(intervention.int_client != null && intervention.int_client.c_adresse!= null)? intervention.int_client.c_adresse.a_adresse+" "+intervention.int_client.c_adresse.a_code_postal+" "+intervention.int_client.c_adresse.a_ville : "aucune"}}<br/>
{{getHeure(intervention)}}
</ion-item>
</ion-col>
<ion-col width-20>
<ion-item>
<ion-checkbox item-right [(ngModel)]="intervention.done_checked" (click)="checkedDone(intervention)"></ion-checkbox>
</ion-item>
</ion-col>
</ion-row>
</ion-item>
</ion-list>