You need to submit a 1099 form if you pay $600 or more to a vendor. Check the IRS website for more details.
The 1099 Summary report summarizes the cash outflows to vendors who are eligible for the 1099. The 1099 Detail report lists all transactions linked to 1099 accounts. So, it provides a breakdown of total 1099 eligible sums.
If you are using QuickBooks for real estate and property management, you can view how much was paid to property owners to file your 1099s.