Debt	3 Months Ended
Mar. 31, 2014
Debt Disclosure [Abstract]
Debt	F. Debt – In the first quarter of 2014, holders of $575 principal amount of Alcoa’s 5.25% Convertible Notes due March 15, 2014 (the “Notes”) exercised their option to convert the Notes into 89 million shares of Alcoa common stock. The conversion rate for the Notes was 155.4908 shares of Alcoa’s common stock per $1,000 (in whole dollars) principal amount of notes, equivalent to a conversion price of $6.43 per share. The difference between the $575 principal amount of the Notes and the $89 par value of the issued shares increased Additional capital on the accompanying Consolidated Balance Sheet. This transaction was not reflected in the accompanying Statement of Consolidated Cash Flows as it represents a noncash financing activity. At the end of 2013, Alcoa had ten revolving credit facilities (excluding Alcoa’s Five-Year Revolving Credit Facility), each with a different financial institution, providing a combined capacity of $1,190 and expiration dates ranging from February 2014 through December 2015. A credit facility ($150 capacity) that was due to expire in February 2014 was extended to March 2015 in the first quarter of 2014. Another credit facility ($150 capacity) expired in March 2014 (a new agreement with the same financial institution was entered into in April 2014). Also in the first quarter of 2014, Alcoa entered into an eleventh revolving credit agreement, providing a $50 credit facility with an expiration date of February 2016. The purpose of any borrowings under all eleven arrangements is to provide for working capital requirements and for other general corporate purposes. The covenants contained in all eleven arrangements are the same as Alcoa’s Five-Year Revolving Credit Agreement (see the Credit Facilities section of Note K to the Consolidated Financial Statements included in Alcoa’s 2013 Form 10-K). During the first quarter of 2014, Alcoa borrowed and repaid $620 under these credit arrangements. The weighted-average interest rate and weighted-average days outstanding of the borrowings during the first quarter of 2014 were 1.53% and 49 days, respectively.

F. Debt – In the first quarter of 2014, holders of $575 principal amount of Alcoa’s 5.25% Convertible Notes due March 15, 2014 (the “Notes”) exercised their option to convert the Notes into 89 million shares of Alcoa common stock. The conversion rate for the Notes was 155.4908 shares of Alcoa’s common stock per $1,000 (in whole dollars) principal amount of notes, equivalent to a conversion price of $6.43 per share. The difference between the $575 principal amount of the Notes and the $89 par value of the issued shares increased Additional capital on the accompanying Consolidated Balance Sheet. This transaction was not reflected in the accompanying Statement of Consolidated Cash Flows as it represents a noncash financing activity.

At the end of 2013, Alcoa had ten revolving credit facilities (excluding Alcoa’s Five-Year Revolving Credit Facility), each with a different financial institution, providing a combined capacity of $1,190 and expiration dates ranging from February 2014 through December 2015. A credit facility ($150 capacity) that was due to expire in February 2014 was extended to March 2015 in the first quarter of 2014. Another credit facility ($150 capacity) expired in March 2014 (a new agreement with the same financial institution was entered into in April 2014). Also in the first quarter of 2014, Alcoa entered into an eleventh revolving credit agreement, providing a $50 credit facility with an expiration date of February 2016.

The purpose of any borrowings under all eleven arrangements is to provide for working capital requirements and for other general corporate purposes. The covenants contained in all eleven arrangements are the same as Alcoa’s Five-Year Revolving Credit Agreement (see the Credit Facilities section of Note K to the Consolidated Financial Statements included in Alcoa’s 2013 Form 10-K).

During the first quarter of 2014, Alcoa borrowed and repaid $620 under these credit arrangements. The weighted-average interest rate and weighted-average days outstanding of the borrowings during the first quarter of 2014 were 1.53% and 49 days, respectively.