The notes to a firm’s financial statements reveal that the obligations for postretirement health care benefits at the end of 2017 total $2.1 billion. The fair value of plan assets for these benefits at the end of 2017 is reported at zero, with an unrecognized net actuarial loss of $310 million reported for the same year. Calculate the amount of the postretirement health care benefit obligation reported by the firm at the end of 2017. Discuss what classification category (or categories) on the balance sheet would appropriately include the obligation.