Open the Google Doc
Click Share in the top-right corner
Find the person you want to make the owner
Click the dropdown next to their name
Select Transfer ownership
Confirm the change
If prompted, click Send invitation or Yes to complete the transfer
Open the Google Doc
Click Share in the top-right corner
Find the person you want to make the owner
Click the dropdown next to their name
Select Transfer ownership
Confirm the change
If prompted, click Send invitation or Yes to complete the transfer