Wan-Bissaka, Rashford and Cavani added to the own-goal by Bednarek as United went into halftime 4-0 ahead. Martial scored twice, with McTominay, Fernandes and James also netting.
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A 2-1 home loss to last-place Sheffield United prevented Man United from returning to first place.
Bruno Fernandes bent in a free kick in the 78th minute to send United into the fifth round with a 3-2 victory.
Liverpool, which had a makeshift defense due to injuries, stayed three points behind United, which is chasing its first title since 2013.
The last time United was top after 17 games of a league campaign, Alex Ferguson was in charge in what proved to be the final season of his long managerial tenure at Old Trafford.
Manchester United also entered the next round with a 1-0 victory over Watford. Scott McTominay, who wore the armband for the first time in his United career, scored the only goal in the game.
United reached an agreement with the Serie A club for the 18-year-old Diallo on Oct. 5, subject to a medical, work permit and personal terms.
City beat fierce rival United 2-0 at Old Trafford on Wednesday thanks to second-half goals by John Stones and Fernandinho, setting up a meeting with Tottenham in the League Cup final at Wembley Stadium on April 25.
Solskjaer is on the cusp of what would be seen as something of a breakthrough for United, which has not won a trophy since 2017 and was beaten in the semifinals of three competitions last season.
Fletcher spent 20 years as a player with United, making more than 340 appearances for the senior team from 2003-15 after coming through the academy.
United went level on points with leader Liverpool with a 2-1 victory that ended Aston Villa's five-game unbeaten run on Friday.
Docherty led United to top division promotion in 1975 and FA Cup victory in 1977.
Cavani had used the word "negrito" to thank a follower who congratulated the striker for his performance in United's 3-2 win in the league over Southampton on November 29.
Ole Gunnar Solskjaer's side rose to second place — two points behind Premier League leader Liverpool — with a 1-0 victory over Wolverhampton on Tuesday.
Leicester is three points behind Liverpool, which hosts West Bromwich Albion on Sunday. United is a point behind in third.
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The documentary largely focusses on the Manchester United sides under two of the club's most influential managers - Matt Busby and Sir Alex Ferguson.
The striker scored twice to lead Manchester United's recovery to beat Sheffield United 3-2 in the Premier League on Thursday.
While the Manchester clubs face each other at Old Trafford, Real Madrid take on Atletico at Estadio Afredo de Stefano.
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