Acquisitions and Divestitures	9 Months Ended
Sep. 30, 2014
Business Combinations [Abstract]
Acquisitions and Divestitures	E. Acquisitions and Divestitures – On June 25, 2014, Alcoa signed a definitive agreement to acquire Firth Rixson, a global leader in aerospace jet engine components, from Oak Hill Capital Partners for $2,850. The purchase price is composed of $2,350 in cash and $500 of Alcoa common stock with a potential earn-out of $150. The common stock component is equivalent to 36,523,010 shares at a per share price of $13.69, as stated in the agreement. Also on June 25, 2014, Alcoa entered into a commitment with a financial institution for a 364-day senior unsecured bridge term loan facility in the amount of $2,500 for the purpose of financing all or a portion of the cash consideration for this acquisition and to pay fees and expenses incurred in connection therewith. On September 22, 2014, Alcoa completed the issuance of $2,500 in debt (see Note G) and equity (see Note K) instruments and terminated the 364-day senior unsecured bridge term loan facility in its entirety. In the third quarter of 2014, Alcoa recorded $13 ($8 after-tax) in Interest expense on the accompanying Statement of Consolidated Operations for costs associated with the execution and termination of the 364-day senior unsecured bridge term loan facility. The purpose of this acquisition is to strengthen Alcoa’s aerospace business and position the Company to capture additional aerospace growth with a broader range of high-growth, value-add jet engine components. The completion of the acquisition is subject to customary closing conditions and regulatory approvals (in the 2014 third quarter, Alcoa received such approval from the United States and from some, but not all, international markets) and is expected to close by the end of 2014. At that time, Firth Rixson will be included within Alcoa’s Engineered Products and Solutions segment. In August 2014, Alcoa completed the acquisition of the 30% outstanding noncontrolling interest in the aluminum brazing sheet venture in Kunshan City, China from Shanxi Yuncheng Engraving Group for $28. The $3 difference between the purchase price and the carrying value of the noncontrolling interest on Alcoa’s Consolidated Balance Sheet was included in Additional capital.

E. Acquisitions and Divestitures – On June 25, 2014, Alcoa signed a definitive agreement to acquire Firth Rixson, a global leader in aerospace jet engine components, from Oak Hill Capital Partners for $2,850. The purchase price is composed of $2,350 in cash and $500 of Alcoa common stock with a potential earn-out of $150. The common stock component is equivalent to 36,523,010 shares at a per share price of $13.69, as stated in the agreement. Also on June 25, 2014, Alcoa entered into a commitment with a financial institution for a 364-day senior unsecured bridge term loan facility in the amount of $2,500 for the purpose of financing all or a portion of the cash consideration for this acquisition and to pay fees and expenses incurred in connection therewith. On September 22, 2014, Alcoa completed the issuance of $2,500 in debt (see Note G) and equity (see Note K) instruments and terminated the 364-day senior unsecured bridge term loan facility in its entirety. In the third quarter of 2014, Alcoa recorded $13 ($8 after-tax) in Interest expense on the accompanying Statement of Consolidated Operations for costs associated with the execution and termination of the 364-day senior unsecured bridge term loan facility. The purpose of this acquisition is to strengthen Alcoa’s aerospace business and position the Company to capture additional aerospace growth with a broader range of high-growth, value-add jet engine components. The completion of the acquisition is subject to customary closing conditions and regulatory approvals (in the 2014 third quarter, Alcoa received such approval from the United States and from some, but not all, international markets) and is expected to close by the end of 2014. At that time, Firth Rixson will be included within Alcoa’s Engineered Products and Solutions segment.

In August 2014, Alcoa completed the acquisition of the 30% outstanding noncontrolling interest in the aluminum brazing sheet venture in Kunshan City, China from Shanxi Yuncheng Engraving Group for $28. The $3 difference between the purchase price and the carrying value of the noncontrolling interest on Alcoa’s Consolidated Balance Sheet was included in Additional capital.