How to get the Name and Description of the Record Type in a Lightning Component

<aura:component controller="RecordTypeC"
                implements="force:appHostable,flexipage:availableForAllPageTypes,flexipage:availableForRecordHome,force:hasRecordId,forceCommunity:availableForAllPageTypes,force:lightningQuickAction" access="global" >
    <aura:handler name="init" value="{!this}" action="{!c.doInit}"/>
    <aura:attribute name="availableRecordTypes" type="List" />
    <aura:attribute name="recordTypeId" type="String" default=""/>
    <aura:attribute name="loading" type="Boolean"/>
    <aura:attribute name="retrievedTypes" type="Boolean"/>
    <aura:renderIf isTrue="{!v.retrievedTypes}">
        <fieldset class="slds-form-element">
            <aura:if isTrue="{!v.loading}">
                <lightning:spinner variant="brand"  size="large" />
            </aura:if>
            <table>
                <tr><td width="25%">
                    <legend class="slds-form-element__legend slds-form-element__label"><b>Select a Record Type</b></legend></td>
                    <div class="slds-form-element__control">
                        <aura:iteration items="{!v.availableRecordTypes}" var="type" indexVar="key">
                            <span class="slds-radio">
                                <input id="{!'radio-'+type.value}" value="{!type.value}" name="options" type="radio" onchange="{!c.optionSelected}"/>
                                <label class="slds-radio__label" for="{!'radio-'+type.value}">
                                    <span class="slds-radio_faux"></span>
                                    <span class="slds-form-element__label"><b>{!type.name}</b></span><br></br>
                                    <div class="slds-p-left_xx-large">
                                    <span class="slds-form-element__label"><b>{!type.value}</b></span><br></br>
                                    </div>
                                    </label>
                            </span>
                            <br></br> 
                        </aura:iteration>
                    </div>
                </tr>
            </table>
        </fieldset>
    </aura:renderIf>
</aura:component>

Controller:

({
    doInit : function(component,event,helper){
        helper.getRecordTypes(component,event,helper);        
    },
    optionSelected : function(component,event,helper){
        component.set("v.loading",true);
        var recordName = event.target.getAttribute("value");
        var recordTypes = component.get("v.availableRecordTypes");
        for(var i=0;i<recordTypes.length;i++){
            if(recordName==recordTypes[i].value){   
                component.set("v.recordTypeId",recordTypes[i].key);
                break;
            }
        }
    }
})

Helper:

({
    getRecordTypes : function(component,event,helper){
        var action = component.get("c.GetAvailableRecordTypeAccount");
        action.setCallback(this,function(response){
            var state = response.getState();
            if(state === "SUCCESS"){
                var returning = [];
                var recordTypes = response.getReturnValue();
                console.log('recordTypes -> ' + JSON.stringify(recordTypes));
                for(var key in recordTypes){
                    //alert("Record Type Name: " + recordTypes[key]);
                    returning.push({value:recordTypes[key],
                                    name:key});
                }
                console.log('returning -> ' + JSON.stringify(returning));
                component.set("v.availableRecordTypes",returning);
                component.set("v.retrievedTypes",true);
            }
            else{
                alert("Temporary Error: There is a problem getting the Record Types.");// Temporary, Will be changed to ToastError.
            }
        });
        $A.enqueueAction(action); 
    }   
})

Apex:

public class RecordTypeC {
    @AuraEnabled
    public static Map<String,String> GetAvailableRecordTypeAccount()
    {
        Map<String,String> recordTypeMap = new Map<String,String>();
        Schema.DescribeSObjectResult R = Account.SObjectType.getDescribe();
        List<Schema.RecordTypeInfo> RT = R.getRecordTypeInfos();
        for(RecordType rec : [SELECT Id,  Name, DeveloperName, Description FROM RecordType WHERE SobjectType = 'Account']) {
            recordTypeMap.put(rec.Name, rec.Description);
            system.debug('recordtype' + recordtypemap);
        }
        return recordTypeMap;
    }   
}