Effective 10/4/17 campaigns will be able to spend up to double the average daily budget that you set. Google says they made the change to help you reach your advertising goals, like clicks and conversions. Still, many advertisers are not even aware of this change and many who are, are not happy about it. They did also state that you won’t ever be charged more than your monthly charging limit.
Be sure to read the whole policy change so that you can make informed decision. Click the link below for additional information. https://support.google.com/adwords/answer/1704443