I use credit cards for almost everything, so it's actually pretty easy to let [insert your favorite transaction aggregator here] break it down for me on a high level.
It's actually been a pet peeve of mine that credit card statements don't break down your transaction into the line items (I think some might but the vast majority don't). WE HAVE THE TECHNOLOGY! What I'd really like is for the merchant to upload an entire receipt to Visa so I don't even have to keep the paper or scan it. Obviously this won't work unless the POS terminal is properly integrated, but most major retailers would be able to do it with little to no overhead.
Of course, it's scary to let Visa know exactly what I'm buying. That doesn't mean I wouldn't like the convenience assuming my information could be properly protected.