Обработка массива обьектов

let arr = [{ 
    "Company": "ААА", 
    "Country": "USA", 
    "Detail": [{ 
      "number": "256", 
      "cost": 170, 
      "status": false, 
    }, { 
      "number": "345", 
      "cost": 720, 
      "status": true, 
    }, { 
      "number": "569", 
      "cost": 702, 
      "status": false, 
    }], 
    "orderID": "564" 
  },{ 
    "Company": "BBB", 
    "Country": "CANADA", 
    "Detail": [{ 
      "number": "589", 
      "cost": 40, 
      "status": true, 
    }, { 
      "number": "354", 
      "cost": 90, 
      "status": true, 
    }, { 
      "number": "478", 
      "cost": 780, 
      "status": true, 
    }], 
    "orderID": "594" 
  },{ 
    "Company": "AAA", 
    "Country": "USA", 
    "Detail": [{ 
      "number": "154", 
      "cost": 140, 
      "status": true, 
    }, { 
      "number": "148", 
      "cost": 920, 
      "status": false, 
    }, { 
      "number": "954", 
      "cost": 680, 
      "status": true, 
    }], 
    "orderID": "514" 
  } 
]; 
 
 
console.log( 
  arr 
    .filter(el => el.Country === 'USA') 
    .reduce((sum, el) =>  
      sum + el.Detail.reduce((dsum, detail) =>  
        dsum + (+detail.status) * detail.cost 
      ,0)  
    ,0) 
);