Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2011
Subsequent Events [Abstract]
Subsequent Events	Y. Subsequent Events Management evaluated all activity of Alcoa 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 January 2012, Alcoa repaid the $322 in outstanding principal of its 6% Notes as scheduled using available cash on hand. Also in January 2012, Alcoa entered into two term loan agreements, totaling $350, with two separate financial institutions and a revolving credit agreement, providing a $100 credit facility, with a third financial institution. In February 2012, Alcoa entered into another revolving credit agreement, providing a $100 credit facility, with a fourth financial institution. The purpose of any borrowings under all four arrangements will be to provide working capital and for other general corporate purposes, including contributions to Alcoa's pension plans ($95 was contributed in January 2012). The two term loans were fully drawn on the same dates as the agreements and are subject to an interest rate equivalent to the 3-month LIBOR plus a 1.5% margin. In February 2012, Alcoa borrowed the $100 under the first credit facility. This borrowing is subject to an interest rate equivalent to the 6-month LIBOR plus a 1.25% margin. The two term loans mature in July 2012 and the two revolving credit facilities expire in December 2012. The covenants contained in all four arrangements are the same as Alcoa's Credit Agreement (see Note K). Furthermore in January 2012, Alcoa's subsidiary, Alumínio, borrowed $280 in new loans with a weighted-average interest rate of 2.32% and a weighted-average maturity of 172 days from two financial institutions. The purpose of these borrowings is to support Alumínio's export operations.

Tabular disclosure of significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, losses resulting from fire or flood, losses on receivables, significant realized and unrealized gains and losses that result from changes in quoted market prices of securities, declines in market prices of inventory, changes in authorized or issued debt (SEC), significant foreign exchange rate changes, substantial loans to insiders or affiliates, significant long-term investments, and substantial dividends not in the ordinary course of business.

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