Table of Contents Following are the components of net pension and postretirement expense (benefit) recognized for the period July 2, 2019 through December 31, 2019, January 1, 2019 through July 1, 2019 and the years ended December 31, 2018 and 2017: 89 Successor Predecessor July 2, 2019 through December 31, 2019 January 1, 2019 through July 1, 2019 Year ended December 31, 2018 2017 Service cost $ 8 $ 7 $ 17 $ 16 Interest cost on projected benefit obligation 4 4 10 9 Expected return on assets (6) (6) (13) (11) Amortization of prior service cost (benefit) — — — (1 ) Unrealized actuarial loss (gain) (1) 9 39 (26) 1 Net expense (benefit) $ 15 $ 44 $ (12 ) $ 14 Non-U.S. Plans Non-Pension Postretirement Benefits Non-U.S. Plans Pension Benefits U.S. Plans U.S. Plans Successor Predecessor July 2, 2019 through December 31, 2019 January 1, 2019 through July 1, 2019 Year ended December 31, 2018 2017 Interest cost on projected benefit obligation $ — $ — $ — $ — Amortization of prior service benefit — — — — Unrealized actuarial loss (gain) (1) — — — (1) Net (benefit) expense $ — $ — $ — $ (1 ) Successor Predecessor July 2, 2019 through December 31, 2019 January 1, 2019 through July 1, 2019 Year ended December 31, 2018 2017 Service cost $ 2 $ 2 $ 3 $ 3 Interest cost on projected benefit obligation 3 4 7 7 Expected return on assets (7 ) (6 ) (14 ) (13 ) Amortization of prior service cost — — — — Unrealized actuarial loss (gain) (1) — 1 11 (6 ) Net (benefit) expense $ (2) $ 1 $ 7 $ (9) Successor Predecessor July 2, 2019 through December 31, 2019 January 1, 2019 through July 1, 2019 Year ended December 31, 2018 2017 Interest cost on projected benefit obligation $ — $ — $ 1 $ 1 Amortization of prior service benefit — — — — Unrealized actuarial loss (gain) (1) (4) 4 2 1 Net (benefit) expense $ (4 ) $ 4 $ 3 $ 2 (1) Upon the application of fresh start accounting, the Company’s pension and other non-pension postretirement liabilities were remeasured as of July 1, 2019. As a result, for the period January 1, 2019 through July 1, 2019, total unrealized actuarial losses of $44 were recorded to “Reorganization, net” in the Consolidated Statements of Operations.