Takata's shares plunged 20 percent in Tokyo Wednesday, after Bloomberg News said the embattled Japanese airbag supplier's recall-related costs could come in as high as $24 billion.

Citing a person familiar with the matter, Bloomberg said the company estimated the "worst case" scenario would involve the recall of 287.5 million airbag inflators at a cost of 2.7 trillion yen ($24 billion).