[["in millions", "interest onlyproduct", "principal andinterest product"], ["2016", "$ 1121", "$ 369"], ["2017", "2107", "538"], ["2018", "927", "734"], ["2019", "648", "576"], ["2020 and thereafter", "3321", "5758"], ["total ( a ) ( b )", "$ 8124", "$ 7975"]]