If you want that kind of detail, you can get your entire Steam purchase history here: Help > Steam support > My account > Data related to your Steam account > Purchase history.

Next, under the Store & Purchase History section, press the View purchase history option. After that, select a pending purchase on your account and then click on the Cancel this transaction option.

You can see the Purchase in the Purchase History of your Steam account and see if it has failed. If the purchase is complete and still the game is not in your library, you need to log out of Steam ...