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Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2011
Cash Flow Information [Abstract] |
Schedule Of Cash Paid For Interest And Income Taxes |
|  | 2011 |  |  | 2010 |  |  | 2009 |
Interest, net of amount capitalized |  | $ | 491 |  |  | $ | 452 |  |  | $ | 396 |
Income taxes, net of amount refunded |  |  | 382 |  |  |  | (67 | ) |  |  | 168 |
Schedule Of Cash Paid For Acquisitions |
|  | 2011 |  |  | 2010 |  |  | 2009 |
Assets acquired |  | $ | 253 |  |  | $ | 87 |  |  | $ | 389 |
Liabilities assumed |  |  | (12 | ) |  |  | (15 | ) |  |  | (294 | )
Noncontrolling interests acquired |  |  | — |  |  |  | 4 |  |  |  | — |
Redemption of convertible securities of subsidiary |  |  | — |  |  |  | 40 |  |  |  | — |
Reduction in Alcoa shareholders' equity |  |  | — |  |  |  | 22 |  |  |  | — |
Gain recognized |  |  | — |  |  |  | — |  |  |  | (92 | )
Cash paid |  |  | 241 |  |  |  | 138 |  |  |  | 3 |
Less: cash acquired |  |  | 1 |  |  |  | — |  |  |  | 115 |
Net cash paid (received) |  | $ | 240 |  |  | $ | 138 |  |  | $ | (112 | )

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