($ in millions) $580 60 Projected Benefit Obligation Balance, January 1, 2018 Service cost Interest cost, discount rate, 5% Gain due to changes in actuarial assumptions in 2018 Pension benefits paid Balance, December 31, 2018 29 (13) (29) $627 ($ in millions) $590 39 Plan Assets Balance, January 1, 2018 Actual return on plan assets (Expected return on plan assets, $44) Cash contributions Pension benefits paid Balance, December 31, 2018 80 (29) $ 680 January 1, 2018, balances: Pension asset Prior service cost-AOCI (amortization $7 per year) Net gain-AOCI (any amortization over 10 years) ($ in millions) $ 10 35 109 Required: Prepare a pension spreadsheet to show the relationship among the PBO, plan assets, prior service cost, the net gain, pension expense, and the net pension asset. (Enter credit amounts with a minus sign and debit amounts with a positive sign.) Prior N et an $ (109) Pension Expense Cash Net Pension (Liability) Asset 10 Plan Service PBO Assets Cost-AOCI $(580) $ 590 $ 35 (60) (29) ( 441 60 29 (44) (44) ($ in millions) Balance, Jan. 1, 2018 Service cost Interest cost, 5% Expected return on assets Adjust for: Loss on assets Amortization of: Prior service cost Net gain Gain on PBO Cash funding Retiree benefits Balance., Dec. 31, 2018 (5) 23 $(646) $ 629 $ 35 $ (109) $ 45 S (63)