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Debt (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 3 Months Ended |  | 3 Months Ended |  |  | 3 Months Ended |  | 3 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2012 | Mar. 31, 2012 | Mar. 31, 2011 | Mar. 31, 2012 Aluminio [Member] D | Jan. 31, 2012 Aluminio [Member] | Mar. 31, 2012 Revolving Credit Agreement [Member] Y | Feb. 29, 2012 Revolving Credit Agreement [Member] | Jan. 31, 2012 Revolving Credit Agreement [Member] | Mar. 31, 2012 Revolving Credit Facility [Member] | Mar. 31, 2012 Two Term Loan Agreements [Member] | Jan. 31, 2012 Two Term Loan Agreements [Member] | Mar. 31, 2012 First Loan Agreement [Member] | Feb. 29, 2012 First Loan Agreement [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of outstanding debt | $ 322 | $ 414 | $ 33 | $ 60 |  |  |  |  |  |  |  |  |
Outstanding debt, interest rate | 6.00% |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, amount outstanding |  |  |  |  | 280 |  | 100 | 100 |  |  | 350 |  | 100
Contributions to pension plans |  | $ 213 |  |  |  |  |  |  |  |  |  |  |
Applicable margin on LIBOR |  |  |  |  |  |  |  |  |  | 1.50% |  | 1.25% |
Line of credit facility, expiration date |  |  |  |  |  |  |  |  | December 2012 | July 2012 |  |  |
Weighted-average interest rate |  |  |  | 2.32% |  |  |  |  |  |  |  |  |
Weighted-average maturity days |  |  |  | 172 |  |  |  |  |  |  |  |  |
Revolving credit facility, term |  |  |  |  |  | 5 |  |  |  |  |  |  |

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