| http://www.w3.org/ns/prov#value | - ctible amounts billed subject to refund24Table of ContentsCritical Accounting PolicySummary of PolicyFactors Influencing Application of the PolicyPension and other postretirement plansPension and other postretirement plan costs and liabilities are determined on an actuarial basis using a September 30 measurement date and are affected by numerous assumptions and estimates including the market value
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