Is it normal to think about suicide?

First off, I am not a threat to myself nor am I going to kill myself. I do, however, think about it pretty often in an abstract way. I suffer from depression and have actually been suicidal, but right now I'm just thinking about it generally. I've thought about where I'd want to go, or how I'd do it if I were to do it, but I know I would never actually do anything. These thoughts don't really upset me or anything, so I'm not sure if every one thinks these things or if I've simply become so depressed that my own death doesn't even concern me. Again, I am not going to harm myself and am very safe in the comfort of my home, I was just wondering if anyone else thinks about suicide in the same abstract and distant way that I do.