Acquisitions and Divestitures	9 Months Ended
Sep. 30, 2020
Business Combinations [Abstract]
Acquisitions and Divestitures	Acquisitions and Divestitures On February 1, 2020, Arconic Corporation completed the sale of its aluminum rolling mill (specialty foil and sheet products) in Itapissuma, Brazil to Companhia Brasileira de Alumínio for a net $46 in cash, resulting in a loss of $59 (pretax). In 2019, Arconic Corporation recognized a charge of $53 (pretax), consisting of $59 (pretax) in the 2019 third quarter for the non-cash impairment of the carrying value of the rolling mill’s net assets, primarily properties, plants, and equipment, as a result of entering into an agreement in August 2019 to sell this rolling mill, and a $6 credit in the 2019 fourth quarter to reflect subsequent changes in both foreign currency exchange rates and working capital balances. Additionally, in the 2020 first quarter, Arconic Corporation recognized a charge of $6 (pretax) for further necessary adjustments upon completion of the divestiture. Each of these amounts were recorded in Restructuring and other charges (see Note E) on the Company’s Statement of Consolidated Operations in the respective reporting periods. This transaction remains subject to certain post-closing adjustments as defined in the agreement. Prior to the divestiture, this rolling mill’s operating results and assets and liabilities were reported in the Rolled Products segment. The rolling mill generated third-party sales of $143, $179, and $162 in 2019, 2018, and 2017, respectively, and, at the time of divestiture, had approximately 500 employees. On March 1, 2020, Arconic Corporation completed the sale of its hard alloy extrusions plant in South Korea to SeAH Besteel Corporation for a net $55 in cash, resulting in a gain of $31 (pretax), which was recorded in Restructuring and other charges (see Note E) on the accompanying Statement of Consolidated Operations. The gain is net of a $6 write-off of related goodwill. In the 2020 second quarter, Arconic Corporation received an additional $1 in cash as a result of a post-closing adjustment, which was previously contemplated in the aforementioned gain. This transaction is no longer subject to post-closing adjustments. Prior to the divestiture, this plant’s operating results and assets and liabilities were reported in the Extrusions segment. The extrusions plant generated third-party sales of $51, $53, and $50 in 2019, 2018, and 2017, respectively, and, at the time of divestiture, had approximately 160 employees.

On February 1, 2020, Arconic Corporation completed the sale of its aluminum rolling mill (specialty foil and sheet products) in Itapissuma, Brazil to Companhia Brasileira de Alumínio for a net $46 in cash, resulting in a loss of $59 (pretax). In 2019, Arconic Corporation recognized a charge of $53 (pretax), consisting of $59 (pretax) in the 2019 third quarter for the non-cash impairment of the carrying value of the rolling mill’s net assets, primarily properties, plants, and equipment, as a result of entering into an agreement in August 2019 to sell this rolling mill, and a $6 credit in the 2019 fourth quarter to reflect subsequent changes in both foreign currency exchange rates and working capital balances. Additionally, in the 2020 first quarter, Arconic Corporation recognized a charge of $6 (pretax) for further necessary adjustments upon completion of the divestiture. Each of these amounts were recorded in Restructuring and other charges (see Note E) on the Company’s Statement of Consolidated Operations in the respective reporting periods. This transaction remains subject to certain post-closing adjustments as defined in the agreement. Prior to the divestiture, this rolling mill’s operating results and assets and liabilities were reported in the Rolled Products segment. The rolling mill generated third-party sales of $143, $179, and $162 in 2019, 2018, and 2017, respectively, and, at the time of divestiture, had approximately 500 employees.

On March 1, 2020, Arconic Corporation completed the sale of its hard alloy extrusions plant in South Korea to SeAH Besteel Corporation for a net $55 in cash, resulting in a gain of $31 (pretax), which was recorded in Restructuring and other charges (see Note E) on the accompanying Statement of Consolidated Operations. The gain is net of a $6 write-off of related goodwill. In the 2020 second quarter, Arconic Corporation received an additional $1 in cash as a result of a post-closing adjustment, which was previously contemplated in the aforementioned gain. This transaction is no longer subject to post-closing adjustments. Prior to the divestiture, this plant’s operating results and assets and liabilities were reported in the Extrusions segment. The extrusions plant generated third-party sales of $51, $53, and $50 in 2019, 2018, and 2017, respectively, and, at the time of divestiture, had approximately 160 employees.