Pep Guardiola's side won an historic treble of domestic trophies last season with the Premier League and FA Cup, and they thoroughly deserved their triumph despite a spirited effort from Aston Villa.
Manchester City looked like they would stroll to victory when Sergio Aguero's strike and Rodri's header from a corner that was hotly contested by Villa put them in complete control inside 30 minutes.
Villa, while strictly second best, offered themselves a lifeline when Mbwana Samatta headed in from Anwar El Ghazi's cross four minutes before the interval.