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Pension and Other Postretirement Benefits | 9 Months Ended
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Sep. 30, 2018
Retirement Benefits [Abstract] |
Pension and Other Postretirement Benefits | Pension and Other Postretirement Benefits The components of net periodic benefit cost were as follows:
| Third quarter ended |  | Nine months ended
| September 30, |  | September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Pension benefits |  |  |  |  |  |  |
Service cost | $ | 9 |  |  | $ | 23 |  |  | $ | 37 |  |  | $ | 67 |
Interest cost | 54 |  |  | 59 |  |  | 164 |  |  | 175 |
Expected return on plan assets | (76 | ) |  | (83 | ) |  | (230 | ) |  | (248 | )
Recognized net actuarial loss | 42 |  |  | 55 |  |  | 126 |  |  | 165 |
Amortization of prior service cost (benefit) | 1 |  |  | 1 |  |  | 3 |  |  | 4 |
Settlements | 4 |  |  | — |  |  | 4 |  |  | — |
Curtailments | — |  |  | — |  |  | 14 |  |  | — |
Net periodic benefit cost(1) | $ | 34 |  |  | $ | 55 |  |  | $ | 118 |  |  | $ | 163 |
Other postretirement benefits |  |  |  |  |  |  |
Service cost | $ | 2 |  |  | $ | 2 |  |  | $ | 6 |  |  | $ | 6 |
Interest cost | 7 |  |  | 7 |  |  | 21 |  |  | 22 |
Recognized net actuarial loss | 1 |  |  | 2 |  |  | 5 |  |  | 4 |
Amortization of prior service cost (benefit) | (2 | ) |  | (2 | ) |  | (6 | ) |  | (6 | )
Curtailments | (28 | ) |  | — |  |  | (28 | ) |  | — |
Net periodic benefit cost(1) | $ | (20 | ) |  | $ | 9 |  |  | $ | (2 | ) |  | $ | 26 |
(1) | Service cost was included within Cost of goods sold, Selling, general administrative, and other expenses, and Research and development expenses; curtailments and settlements were included in Restructuring and other charges; and all other cost components were recorded in Other expense (income), net in the Statement of Consolidated Operations.
In the first quarter of 2018, the Company announced that, effective April 1, 2018, benefit accruals for future service and compensation under all of the Company's qualified and non-qualified defined benefit pension plans for U.S. salaried and non-bargaining hourly employees ceased. As a result of this change, in the first quarter of 2018, the Company recorded a decrease to the Accrued pension benefits liability of $136 related to the reduction of future benefits, $141 offset in Accumulated other comprehensive loss, and curtailment charges of $5 in Restructuring and other charges. In conjunction with the separation of Alcoa Inc. on November 1, 2016, the Pension Benefit Guaranty Corporation approved management’s plan to separate the Alcoa Inc. pension plans between Arconic Inc. and Alcoa Corporation. The plan stipulates that Arconic will make cash contributions over a period of 30 months (from November 1, 2016) to its two largest pension plans. Payments are expected to be made in three increments of no less than $50 each ($150 total) over this 30-month period. The Company made payments of $50 in March 2018 and $50 in April 2017. In the third quarter of 2018, the 2018 U.S. pension plan valuations were completed and additional pension contributions of $16 that were made in the first quarter of 2018 were able to be used to partially satisfy the third $50 requirement. The remaining $34 payment is expected to be made in 2019. Through the third quarter of 2018, $116 of pension contributions have been made toward the $150 requirement. On April 13, 2018, the United Auto Workers ratified a new five-year labor agreement, covering approximately 1,300 U.S. employees of Arconic, which expires on March 31, 2023. A provision within the agreement includes a retirement benefit increase for future retirees that participate in a defined benefit pension plan, which impacts approximately 300 of those employees. In addition, effective January 1, 2019, benefit accruals for future service will cease. As result of these changes, a curtailment charge of $9 was recorded in Restructuring and other charges in the second quarter of 2018. In the third quarter of 2018, the Company announced that effective December 31, 2018, it will end all pre-Medicare medical, prescription drug and vision coverage for current and future salaried and non-bargained hourly employees and retirees of the Company and its subsidiaries. As a result of this change, in the third quarter of 2018, the Company recorded a decrease to the Accrued other postretirement benefits liability of $32 related to the reduction of future benefits, $4 offset in Accumulated other comprehensive loss, and a curtailment benefit of $28 in Restructuring and other charges. In the third quarter of 2018, settlement accounting applied to a U.S. pension plan due to the payment of lump sums, resulting in a charge of $4 that was recorded in Restructuring and other charges. In the fourth quarter of 2018, settlement accounting is expected to apply to certain U.S. pension plans due to the significant amount of lump sum payments made to participants. The settlement will result in a charge that is expected to be in the range of $70 to $85 that will be recorded in Restructuring and other charges. The actual charge will be based on the total lump sum payments for the year along with any updates to the plan assets and obligations based upon market conditions.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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