The following incomplete (columns have missing amounts) pension spreadsheet is for Old Tucson Corporation (OTC). ($ in millions) debit (Credit) Beginning balance Service cost Interest cost Expected return on assets Gain/loss on assets Amortization of: Prior service cost Net gain/loss Loss on PBO Contributions to fund Retiree benefits paid Ending balance What was the balance of the net pension asset/liability reported in the balance sheet at the end of the previous year?