That would depend upon how many amps will be used in the sub-panel. For example, a 30-A subpanel would need a minimum of 10 AWG feeder conductors.
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Depends on the size of the sub-panel in that garage. If you are installing a 60 amp sub-panel 400 feet away from the main service panel then use AWG # 4.
I would install a 60 amp sub-panel and use AWG #3 copper.
A 200 amp service panel with a 60 amp sub-panel.
A 100-A sub-panel would be fed from a 100-A breaker.
A domestic D/W uses 14 gauge wire.