The format is not the same across the various insurance companies but the expectation is!
Here are a few insurance company quotes regarding the value of a home inventory:
Travelers Insurance
“Conducting a Personal Property Inventory” literature states: “Take the time to compile an inventory of your home now, and it will save you precious time and frustration later.” “Benefits of having a personal property inventory include:
Helps to ensure you have the coverage you need.
In the event of a loss, it makes it easier for you to file a complete and prompt claim, supported by accurate documentation.
Farmers Insurance Group
The following can be found on the back of their "Household Contents Inventory Record Book" - "This record can be worth thousands of dollars to you. Keep it in a safe place outside your home."
State Farm Insurance
They offer the following under their "Home Inventory Tips" - "The threat of loss of property from fire, theft, or other causes is always present. An accurate inventory and proof of ownership at the same time of a loss can make claim settlement easier and faster."
Allstate Insurance
Under their "Your Property" section, they ask you to ask yourself, "Do I have an inventory and photographs?"