Edit in JSFiddle

var myApp = angular.module('myApp', []);

myApp.controller('UserCtrl', ['$scope', function ($scope) {
    
	$scope.user = {};
    $scope.user.details = {
			"username": "Todd Motto",
			"id": "89101112"
		};
    
}]);

<div ng-app="myApp">
    <div ng-controller="UserCtrl">
        <p class="username">Welcome, {{ user.details.username }}</p>
        <p class="id">User ID: {{ user.details.id }}</p>
    </div>
</div>