The event is officially the most-watched presidential debate of all time, beating out the 1980 debate between President Jimmy Carter and his challenger Ronald Reagan.
No other debate in the 56 years since candidates first began televised debates has come close to the 84 million mark.
In reality, 84 million households had their TVs turned to one of the stations broadcasting the Hillary Clinton/Donald Trump debate on Monday night.
80.6 million households watched Carter vs. Reagan.