Jones Company has a postretirement benefit (health care) plan for its employees. On January 1, 2017, the balance in the Accumulated postretirement benefit obligation account was $300 million. The assumed discount ratefor purposes of determining postretirement obligations and expensesis 8%. Jones does not prefund postretirement benefits, so there are no plan assets. It created a $45 million prior service costcreditat the end of 2016 when the company modified the health care plan to reduce the maximum benefits paid to each employee. This amount is being amortized over 15 years. The service cost component of postretirement benefits for 2017 is $35 million.