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Debt (Narrative) (Details) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended |  |  | 1 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  | 12 Months Ended |  |  | 1 Months Ended | 12 Months Ended |  |  |  | 12 Months Ended |  |  | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 3 Months Ended | 12 Months Ended |  | 6 Months Ended | 12 Months Ended |  |  |  | 12 Months Ended |  |  | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2011 USD ($) | Aug. 31, 2010 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Dec. 31, 2009 USD ($) | Jan. 31, 2012 | Jul. 25, 2011 USD ($) | Aug. 31, 2010 Notes Due 2011 [Member] USD ($) | Dec. 31, 2010 Notes Due 2012 [Member] USD ($) | Aug. 31, 2010 Notes Due 2012 [Member] USD ($) | Dec. 31, 2011 6.50% Notes, Due 2011 [Member] | Aug. 31, 2010 6.50% Notes, Due 2011 [Member] | Apr. 30, 2011 5.40% Notes, Due 2021 [Member] USD ($) | Dec. 31, 2011 5.40% Notes, Due 2021 [Member] USD ($) | Dec. 31, 2010 5.40% Notes, Due 2021 [Member] USD ($) | May 31, 2011 6% Notes, Due 2013 [Member] USD ($) | Dec. 31, 2011 6% Notes, Due 2013 [Member] USD ($) | Dec. 31, 2010 6% Notes, Due 2013 [Member] USD ($) | Aug. 31, 2010 7.375% Notes, Due 2010 [Member] USD ($) | Aug. 31, 2010 6.15% Notes, Due 2020 [Member] USD ($) | Dec. 31, 2011 6.15% Notes, Due 2020 [Member] USD ($) | Dec. 31, 2010 6.15% Notes, Due 2020 [Member] USD ($) | Dec. 31, 2011 6% Notes, Due 2012 [Member] USD ($) | Dec. 31, 2010 6% Notes, Due 2012 [Member] USD ($) | Aug. 31, 2010 6% Notes, Due 2012 [Member] | May 31, 2011 5.375% Notes, Due 2013 [Member] USD ($) | Aug. 31, 2010 5.375% Notes, Due 2013 [Member] USD ($) | Dec. 31, 2011 5.375% Notes, Due 2013 [Member] | Dec. 31, 2010 5.375% Notes, Due 2013 [Member] USD ($) | Dec. 31, 2011 Revolving Credit Facility [Member] | Dec. 31, 2011 Loan Agreement With BNDES [Member] USD ($) | Dec. 31, 2011 Loan Agreement With BNDES [Member] BRL | Dec. 31, 2010 Loan Agreement With BNDES [Member] USD ($) | Dec. 31, 2010 Loan Agreement With BNDES [Member] BRL | Dec. 31, 2011 Loan Agreement With BNDES [Member] Two Of The Subloans [Member] BRL | Jun. 30, 2008 Loan Agreement With BNDES [Member] Three Of The Subloans [Member] USD ($) | Jun. 30, 2008 Loan Agreement With BNDES [Member] Three Of The Subloans [Member] BRL | Dec. 31, 2011 Loan Agreement With BNDES [Member] Third Subloan [Member] BRL | Dec. 31, 2011 Commercial Paper [Member] USD ($) | Dec. 31, 2010 Commercial Paper [Member] USD ($) | Dec. 31, 2009 Commercial Paper [Member] | May 31, 2011 Debt Principal [Member] USD ($) | Aug. 31, 2010 Debt Principal [Member] USD ($) | May 31, 2011 Debt Accrued And Unpaid Interest [Member] USD ($) | Aug. 31, 2010 Debt Accrued And Unpaid Interest [Member] USD ($) | Apr. 30, 2011 Brazil Bauxite Mine [Member] 5.40% Notes, Due 2021 [Member] USD ($) | Aug. 31, 2010 Brazil Bauxite Mine [Member] 6.15% Notes, Due 2020 [Member] USD ($) | Dec. 31, 2011 Maximum [Member] 5.40% Notes, Due 2021 [Member] | Aug. 31, 2010 Maximum [Member] 6.15% Notes, Due 2020 [Member] | Dec. 31, 2011 Maximum [Member] Commercial Paper [Member] | Dec. 31, 2011 Minimum [Member] 5.40% Notes, Due 2021 [Member] | Aug. 31, 2010 Minimum [Member] 6.15% Notes, Due 2020 [Member] | Dec. 31, 2011 Minimum [Member] Commercial Paper [Member] | Dec. 31, 2011 First Loans [Member] Subloan Of $233 [Member] | Dec. 31, 2011 First Loans [Member] Subloan Of $15 [Member] | Mar. 31, 2008 First Loans [Member] First Loan Agreement [Member] USD ($) | Mar. 31, 2008 First Loans [Member] First Loan Agreement [Member] BRL | Mar. 31, 2008 First Loans [Member] First Loan Agreement [Member] Four Of The Subloans [Member] USD ($) | Mar. 31, 2008 First Loans [Member] First Loan Agreement [Member] Four Of The Subloans [Member] BRL | Dec. 31, 2011 First Loans [Member] First Loan Agreement [Member] Four Of The Subloans [Member] | Dec. 31, 2010 First Loans [Member] First Loan Agreement [Member] Four Of The Subloans [Member] | Jun. 30, 2008 First Loans [Member] First Loan Agreement [Member] Fifth Subloan [Member] USD ($) | Jun. 30, 2008 First Loans [Member] First Loan Agreement [Member] Fifth Subloan [Member] BRL | Dec. 31, 2011 First Loans [Member] First Loan Agreement [Member] Fifth Subloan [Member] | Dec. 31, 2010 First Loans [Member] First Loan Agreement [Member] Fifth Subloan [Member] | Dec. 31, 2011 First Loans [Member] First Loan Agreement [Member] Subloan Of $233 [Member] USD ($) | Dec. 31, 2011 First Loans [Member] First Loan Agreement [Member] Subloan Of $233 [Member] BRL | Dec. 31, 2010 First Loans [Member] First Loan Agreement [Member] Subloan Of $233 [Member] USD ($) | Dec. 31, 2010 First Loans [Member] First Loan Agreement [Member] Subloan Of $233 [Member] BRL | Dec. 31, 2011 First Loans [Member] First Loan Agreement [Member] Subloan Of $15 [Member] USD ($) | Dec. 31, 2011 First Loans [Member] First Loan Agreement [Member] Subloan Of $15 [Member] BRL | Dec. 31, 2010 First Loans [Member] First Loan Agreement [Member] Subloan Of $15 [Member] USD ($) | Dec. 31, 2010 First Loans [Member] First Loan Agreement [Member] Subloan Of $15 [Member] BRL | Dec. 31, 2011 First Loans [Member] Second Loan Agreement [Member] USD ($) | Dec. 31, 2011 First Loans [Member] Second Loan Agreement [Member] BRL | Dec. 31, 2010 First Loans [Member] Second Loan Agreement [Member] | Dec. 31, 2011 First Loans [Member] Second Loan Agreement [Member] Two Of The Subloans [Member] | Dec. 31, 2011 First Loans [Member] Second Loan Agreement [Member] Third Subloan [Member] USD ($) | Dec. 31, 2011 First Loans [Member] Second Loan Agreement [Member] Third Subloan [Member] BRL | Dec. 31, 2011 First Loans [Member] Second Loan Agreement [Member] Subloan Of $339 [Member] USD ($) | Dec. 31, 2011 First Loans [Member] Second Loan Agreement [Member] Subloan Of $339 [Member] BRL | Dec. 31, 2010 First Loans [Member] Second Loan Agreement [Member] Subloan Of $339 [Member] USD ($) | Dec. 31, 2010 First Loans [Member] Second Loan Agreement [Member] Subloan Of $339 [Member] BRL | Dec. 31, 2011 First Loans [Member] Second Loan Agreement [Member] Subloan Of $35 [Member] USD ($) | Dec. 31, 2011 First Loans [Member] Second Loan Agreement [Member] Subloan Of $35 [Member] BRL | Dec. 31, 2010 First Loans [Member] Second Loan Agreement [Member] Subloan Of $35 [Member] USD ($) | Dec. 31, 2010 First Loans [Member] Second Loan Agreement [Member] Subloan Of $35 [Member] BRL | Dec. 31, 2011 First Loans [Member] Loan Agreement With BNDES [Member] Two Of The Subloans [Member] USD ($) | Dec. 31, 2011 First Loans [Member] Loan Agreement With BNDES [Member] Two Of The Subloans [Member] BRL | Dec. 31, 2011 First Loans [Member] Maximum [Member] | May 31, 2009 Second Loans [Member] First Loan Agreement [Member] USD ($) | May 31, 2009 Second Loans [Member] First Loan Agreement [Member] BRL | May 31, 2009 Second Loans [Member] First Loan Agreement [Member] Two Of The Subloans [Member] USD ($) | May 31, 2009 Second Loans [Member] First Loan Agreement [Member] Two Of The Subloans [Member] BRL | Dec. 31, 2011 Second Loans [Member] First Loan Agreement [Member] Two Of The Subloans [Member] | Dec. 31, 2010 Second Loans [Member] First Loan Agreement [Member] Two Of The Subloans [Member] USD ($) | Dec. 31, 2010 Second Loans [Member] First Loan Agreement [Member] Two Of The Subloans [Member] BRL | May 31, 2009 Second Loans [Member] First Loan Agreement [Member] Four Of The Subloans [Member] USD ($) | May 31, 2009 Second Loans [Member] First Loan Agreement [Member] Four Of The Subloans [Member] BRL | Dec. 31, 2011 Second Loans [Member] First Loan Agreement [Member] Four Of The Subloans [Member] | Dec. 31, 2010 Second Loans [Member] First Loan Agreement [Member] Four Of The Subloans [Member] USD ($) | Dec. 31, 2010 Second Loans [Member] First Loan Agreement [Member] Four Of The Subloans [Member] BRL | May 31, 2009 Second Loans [Member] Second Loan Agreement [Member] USD ($) | May 31, 2009 Second Loans [Member] Second Loan Agreement [Member] BRL | Dec. 31, 2011 Second Loans [Member] Second Loan Agreement [Member] | Dec. 31, 2010 Second Loans [Member] Second Loan Agreement [Member] USD ($) | Dec. 31, 2010 Second Loans [Member] Second Loan Agreement [Member] BRL | Dec. 31, 2011 Second Loans [Member] Second Loan Agreement [Member] Two Of The Subloans [Member] USD ($) | Dec. 31, 2011 Second Loans [Member] Second Loan Agreement [Member] Two Of The Subloans [Member] BRL | Dec. 31, 2010 Second Loans [Member] Second Loan Agreement [Member] Two Of The Subloans [Member] USD ($) | Dec. 31, 2010 Second Loans [Member] Second Loan Agreement [Member] Two Of The Subloans [Member] BRL
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of long-term debt maturing in year 2012 |  |  | $ 445 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of long-term debt maturing in year 2013 |  |  | 549 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of long-term debt maturing in year 2014 |  |  | 743 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of long-term debt maturing in year 2015 |  |  | 45 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of long-term debt maturing in year 2016 |  |  | 26 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior debt securities issued under shelf registration statements |  |  | 1,250 | 3,075 |  |  |  |  |  |  |  |  | 1,250 |  |  |  |  |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  |  |  |  |  | 2011 |  |  | 2021 |  |  | 2013 |  |  |  | 2020 |  | 2012 |  |  |  |  | 2013 |  | July 25, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds received from public debt offering |  |  | 1,256 | 1,126 | 1,049 |  |  |  |  |  |  |  | 1,241 |  |  |  |  |  |  | 993 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Early repayment of outstanding notes |  |  |  |  |  |  |  |  |  |  |  |  | 881 |  |  |  |  |  |  | 825 |  |  |  |  |  | 284 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 101 | 88 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option to redeem notes, period prior to notice to holders, days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60 | 60 |  | 30 | 30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt repurchase price, percentage of aggregate principal |  |  |  |  |  |  |  |  |  |  |  |  |  | 101.00% |  |  |  |  |  | 101.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tender offer completed, debt amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase premiums repaid recorded as interest expense | 74 | 42 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain resulting from termination of interest rate swaps, recorded as interest expense |  | 28 | 33 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments on long-term debt | 972 | 878 | 1,194 | 1,757 | 156 |  |  |  |  |  |  |  |  |  |  |  |  |  | 511 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 881 | 825 | 17 | 11 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate |  |  |  |  |  | 6.00% |  |  |  |  |  | 6.50% |  | 5.40% |  |  | 6.00% |  | 7.375% |  | 6.15% |  | 6.00% |  | 6.00% |  |  | 5.375% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  | 9,085 | 9,073 |  |  |  |  |  |  |  |  |  | 1,250 |  |  | 422 | 750 |  |  | 1,000 | 1,000 | 322 | 322 |  |  |  |  | 553 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity date, description |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | matures at various times within one year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal and interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 667 |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, amount outstanding |  |  |  |  |  |  | 3,750 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 355 | 661 | 394 | 662 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 55 | 102 | 186 | 312 | 3 | 7 | 10 | 17 |  |  |  |  |  |  | 191 | 356 | 280 | 469 | 23 | 42 | 29 | 48 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment on loan agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 397 | 687 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 248 | 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 374 | 650 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 321 | 750 |  |  |  |  |  |  |  |  |  |  | 86 | 200 |  |  |  |  |  |  |
Interest on subloans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 233 | 470 |  |  | 15 | 30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35 | 61 |  |  |  |  |  |  |  |  | 339 | 589 |  |  |  | 257 | 600 |  |  |  | 64 | 150 |  |  |  | 69 | 160 |  |  |  | 17 | 40 |  |
Percentage of average cost incurred in raising capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.59% | 4.16% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.48% | 1.48% |  | 0.60% | 0.70% | 3.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.00% | 0.06% |  |  | 2.40% |  |  |  |  |  |  |  |  |  |  |  | 2.02% | 1.99% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average margin on long term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.13% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,275 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit sublimit under credit facility |  |  |  |  |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average interest rate, outstanding borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.50% | 7.50% | 7.52% | 7.52% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.13% | 5.99% |  |  |  |  |  |  |  |  |  |  |  |  | 8.13% | 8.13% |  |  | 6.56% | 6.56% |  |  |  |  |  |  | 7.99% | 7.99% | 7.99% | 7.99% | 5.61% | 5.61% | 6.18% | 6.18% |  |  |  |  |  |  |  | 1.69% |  |  |  |  | 1.59% |  |  |  |  | 1.70% |  |  |  |  |  |
Debt-to-equity ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Early repayment of outstanding borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 | 9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 131 | 209 | 75 | 130 | 7 | 11 | 4 | 8 |  |  |  |  |  |  | 67 | 113 | 64 | 112 | 7 | 11 | 6 | 11 |  |  |  |  |  |  |  |  | 70 | 123 |  |  |  | 23 | 41 |  |  |  | 12 | 19 |  |  | 33 | 57
Aggregate outstanding principal amount |  |  | 500 |  |  |  |  | 253 |  | 195 |  |  |  |  |  | 328 | 422 |  |  |  |  |  |  |  |  | 269 | 47 |  |  |  |  |  |  |  |  |  |  |  | 224 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 233 | 470 |  |  | 15 | 30 |  |  |  |  |  |  |  |  | 339 | 589 |  |  | 35 | 61 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average outstanding commercial paper |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 197 | 166 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees paid to maintain credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin on LIBOR loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.50% |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term borrowings |  |  | 62 | 92 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable settlement arrangements |  |  | 53 | 56 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of difference not to exceed the purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 750 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument subject to aggregate purchase sublimit |  | 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining outstanding debt of Alcoa |  |  |  |  |  |  |  | 330 | 322 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 553 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps terminated, notional amount |  | $ 825 | $ 550 | $ 825 |  |  |  |  | $ 315 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 550 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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