Gabriel Jesus scored the third goal in the 37th minute.
Manchester United boss Jose Mourinho says winning the Premier League is more hard than ever before.
De Gea, meanwhile, reached the century in clean sheets against Everton in all competitions, and has thus far kept his net intact in 79 Premier League games.
Former Liverpool midfielder Redknapp expects Manchester City and Manchester United to compete for the Premier League title this season.
Pair questioned over Parsons Green Tube bombing
Mr and Mrs Jones, who have been foster parents for nearly 40 years, had taken in up to 300 children including eight refugees. There is no suggestion the couple had any knowledge of or were involved in what happened at Parsons Green tube station.
The best and worst dressed from the 2017 Emmys red carpet
It featured some of our favorite TV shows , including " This Is Us ", " Veep ", "Brooklyn Nine-Nine" and "The Handmaid's Tale ". Fonda said, "Back in 1980, in that movie we refused to be controlled by a sexist, egotistical, lying, hypocritical bigot".
Gary Neville highlights problem area for Manchester United
Mata should've had an assist when he played Lukaku through in the first half only for the Belgium to fluff his lines. This was Everton's heaviest league defeat at Old Trafford since losing 5-1 in December 1999 under Walter Smith.
"Although Chelsea had a bad weekend and in my opinion didn't play particularly well, they are the Premier League champions and Conte's side are not going to go away".
Now the gulf in spending between Manchester's big two clubs and the rest of their Premier League rivals can be revealed, in figures that confirm the duo have spent hundreds of millions more than their domestic rivals in the pursuit of success.
Manchester United finished in sixth place in the Premier League table last season but the additions of Nemanja Matic and Lukaku have helped to revamp the Red Devils team.
And, for the most part, these teams have been handed generous draws; Chelsea host Nottingham Forest, Tottenham Hotspur welcome Barnsley to London, and Arsenal face Doncaster Rovers at home.