Foden celebrated City's success with his parents, Phil Sr and Claire, and a can of coke in The Atrium suite at Wembley on Sunday night, where Pep Guardiola and his squad stayed until around 8.30pm before returning home to Manchester to his young son, Ronnie.
This trophy formed part of a historic domestic treble in the last campaign and City's hopes of FA Cup success are still alive, even if their Premier League title defence has been left in tatters by a Liverpool side who suffered a shock loss to Watford on Saturday.
"The performance was OK, the game plan was solid", Villa manager Dean Smith said.
City remain a huge 22 points adrift of Liverpool in the Premier League, but the Reds saw their unbeaten top-flight record ended by Watford a day before Guardiola's men triumphed at Wembley.
Grealish has scored seven times and has made six assists in the Premier League this season, although Aston Villa still find themselves in the relegation zone.
This season City could win the treble, with the FA Cup and Champions League still available, but Guardiola's absurdly high standards mean that it will not be considered a success in his mind because they will nearly certainly miss out on the Premier League title.
So, be better than the last season, I don't think it's going to happen.
Thanks to lavish spending on players, City has become so accustomed to reaching finals in the 12 years under Abu Dhabi ownership that its Wembley allocation wasn't sold out.
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Few players like taking on Villa more than Aguero.
He was a constant menace to Matt Targett on the right-hand side of City's attacking trio, and narrowly missed a chance to double the lead shortly after Aguero's goal.
A lofted ball to the far post by Spain global Rodri was headed back across goal by Phil Foden for Aguero to volley into the turf past goalkeeper Orjan Nyland and into the net.
The thousands of fans who poured onto the Villa Park pitch after their dramatic semi-final victory over Leicester showed the League Cup does still have an ability to captivate and excite. But the second-in-line to the British throne was soon up unexpectedly celebrating.
There was now an edge and tension to this final unlike City's 6-0 rout of Watford in the F.A. Cup final in May. "We can't lose the hunger and not losing the appetite to not take advantage of getting another (trophy)". The Chile goalkeeper has not been offered a new deal by City because he has indicated he wants to play regularly.
"You can't hide away that we're in the bottom three now".
It looked like City would run riot at that stage, but Ally Samatta brought Villa back into the game just before half-time with a flying header after a laughable mistake from John Stones.
He added: "Except the Champions League, that's incredible".