Subsequent Events	3 Months Ended
Mar. 31, 2023
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Management evaluated all activity of Arconic and concluded that no subsequent events have occurred that would require recognition in the Consolidated Financial Statements or disclosure in the Notes to the Consolidated Financial Statements, except as described below. In between March 31, 2023 and May 4, 2023, there were developments in the Howard v. Arconic Inc. et al. litigation matter (see Reynobond PE under Litigation in Note P). Proposed Merger. On May 4, 2023, Arconic entered into an Agreement and Plan of Merger (the “Merger Agreement”) to be acquired by funds managed by affiliates of Apollo Global Management, Inc. (“Apollo”) in an all-cash transaction that values Arconic at an enterprise value of approximately $5.2 billion. The transaction includes a minority investment from funds managed by affiliates of Irenic Capital Management LP (“Irenic”). On the terms and subject to the conditions of the Merger Agreement, the Company’s stockholders will receive $30.00 per share in cash in exchange for each share of outstanding common stock. The transaction is expected to close in the second half of 2023, subject to customary closing conditions, including approval by the Company’s stockholders. Upon the closing of the transaction, Arconic will operate as a privately-held company.

Subsequent Events

3 Months Ended

Mar. 31, 2023

Management evaluated all activity of Arconic and concluded that no subsequent events have occurred that would require recognition in the Consolidated Financial Statements or disclosure in the Notes to the Consolidated Financial Statements, except as described below.

In between March 31, 2023 and May 4, 2023, there were developments in the Howard v. Arconic Inc. et al. litigation matter (see Reynobond PE under Litigation in Note P).

Proposed Merger. On May 4, 2023, Arconic entered into an Agreement and Plan of Merger (the “Merger Agreement”) to be acquired by funds managed by affiliates of Apollo Global Management, Inc. (“Apollo”) in an all-cash transaction that values Arconic at an enterprise value of approximately $5.2 billion. The transaction includes a minority investment from funds managed by affiliates of Irenic Capital Management LP (“Irenic”). On the terms and subject to the conditions of the Merger Agreement, the Company’s stockholders will receive $30.00 per share in cash in exchange for each share of outstanding common stock. The transaction is expected to close in the second half of 2023, subject to customary closing conditions, including approval by the Company’s stockholders. Upon the closing of the transaction, Arconic will operate as a privately-held company.