The amount of detail in a treatment can vary from very rough to "somewhat detailed" to extremely detailed. A very rough treatment can consist of bullet-pointed one-sentence descriptions of each scene. A more detailed treatment might be written as short paragraphs. An extremely detailed treatment might include descriptions not only of actions, but also of sounds, camera angles, colors, etc. (If formatted in a certain way and if very detailed, including specific dialogue, a treatment takes on the form of a "screenplay".)
The first example below is a rough bullet-point treatment of the opening scenes of the animation, Fallen Art. The second example is a more detailed treatment of the opening of the Pixar movie, Monsters, Inc. (For both of these examples, I worked in reverse, from the finished film to the treatment. Normally, one writes a treatment as part of the story-development process.)
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Bullet-point treatment of...
Fallen Art, opening scenes
An empty field, barbed wire fencing, faint sound of upbeat music in the background.
Camera moves slowly up a rickety wooden tower structure. A body falls past camera.
At the top of the tower, a large soldier is standing at the end of a platform looking down to where the body had fallen.
The soldier salutes someone down below, and gestures to soldiers waiting at other end of the platform. One of them is pushed out to him. The big soldier congratulates the little soldier, pins a medal on him, then kicks him off the platform.
As the little soldier falls, a strange man on the ground watches him descend.
When the little soldier hits the ground, the strange man waits a moment until he dies, then takes a photograph of him with an old fashioned camera.
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Somewhat detailed treatment of...
Monsters, Inc., opening scene
A little boy is going to sleep at night.
His parents say goodnight and the light goes out. The boy is nervous about scary noises and movements and keeps looking around, but eventually falls
asleep. A monster enters his bedroom through the bedroom door. The boy thinks he sees something, but then decides he didn't and closes his eyes again. The monster crouches down beside the boy's bed, then rises up and
deliberately scares the boy. The boy
screams. The monster himself becomes terrified and jumps all around the room, screaming and making a huge
mess.
Suddenly the lights go on and the scene is revealed to be a training simulation. The “trainer” monster questions the trainee monster, "Plegm", about what he did wrong. Phlegm is very dim-witted and doesn’t know. The other monsters watching the simulation are also very dim-witted and don’t know. The trainer points out that Plegm left the boy’s bedroom door open and asks why leaving the door open is so important. Dim-witted Phlegm again doesn't know. The others also don't know.
Suddenly, Mr. Waternoose, the boss of Monster’s Inc., strides into the training room and explains to the trainees that it is critical not to leave the door open because a child might come through the door into the monster world, and that children are extremely toxic. Mr. Waternoose explains that though this work is dangerous, it is vitally important because the childrens' screams which the monsters capture provide the energy for the entire Monster city.