Most "professional" angels expect the company to require additional funding rounds (typically from a VC firm) which then necessitate a liquidity event such as a M&A or IPO.
Depending upon the situation, the angel may anticipate being liquidated during the VC round or wait until the VC liquidity event.
The amount of "detail" in your exit (or liquidity) strategy would vary according to what it is. For example, if you have a "repurchase" strategy - you will need to have the details available during the process. If your liquidity plan is a sale then a few possible "suitors" may be all the detail you could provide.
A word of caution: Since you say you aren`t looking for a VC (venture capital company) - I`d recommend that you have some offering documentation, not just a business plan.
The "right" documentation would depend upon the type of transaction and the type of relationship you want to create by the transaction.
Send me a PM if you want to discuss specifics.