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Debt - Additional Information (Detail) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended |  | 12 Months Ended | 1 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  | 2 Months Ended | 12 Months Ended | 1 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 |  | 12 Months Ended | 3 Months Ended | 12 Months Ended |  | 6 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended
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Jan. 31, 2012 USD ($) | May 31, 2011 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2012 BRL | Dec. 31, 2011 USD ($) | Dec. 31, 2011 BRL | Dec. 31, 2010 USD ($) | Jul. 25, 2011 USD ($) | Dec. 31, 2012 Aluminio [Member] USD ($) D | May 31, 2011 Debt Principal [Member] USD ($) | May 31, 2011 Debt Accrued And Unpaid Interest [Member] USD ($) | Dec. 31, 2012 Second Loan Agreement [Member] First Loans [Member] USD ($) | Dec. 31, 2012 Second Loan Agreement [Member] First Loans [Member] BRL | Dec. 31, 2012 Commercial Paper [Member] USD ($) | Dec. 31, 2011 Commercial Paper [Member] USD ($) | Dec. 31, 2010 Commercial Paper [Member] | Dec. 31, 2012 First Loan Agreement [Member] USD ($) | Mar. 31, 2008 First Loan Agreement [Member] First Loans [Member] USD ($) | Mar. 31, 2008 First Loan Agreement [Member] First Loans [Member] BRL | Dec. 31, 2012 Two Term Loan Agreements [Member] USD ($) | Dec. 31, 2012 Two Term Loan Agreements [Member] | Jan. 31, 2012 Two Term Loan Agreements [Member] USD ($) | Nov. 30, 2012 Third Loan Agreement [Member] USD ($) | Dec. 31, 2012 Third Loan Agreement [Member] USD ($) | Dec. 31, 2012 Minimum [Member] Commercial Paper [Member] | Dec. 31, 2012 Maximum [Member] Commercial Paper [Member] | Apr. 30, 2011 5.40% Notes, due 2021 [Member] USD ($) | Dec. 31, 2012 5.40% Notes, due 2021 [Member] | Apr. 30, 2011 5.40% Notes, due 2021 [Member] Brazil Bauxite Mine [Member] USD ($) | Dec. 31, 2012 5.40% Notes, due 2021 [Member] Minimum [Member] D | Dec. 31, 2012 5.40% Notes, due 2021 [Member] Maximum [Member] D | May 31, 2011 5.375% Notes, due 2013 [Member] USD ($) | Dec. 31, 2012 5.375% Notes, due 2013 [Member] | May 31, 2011 6% Notes, due 2013 [Member] USD ($) | Dec. 31, 2012 6% Notes, due 2013 [Member] | Dec. 31, 2011 6% Notes, due 2013 [Member] USD ($) | Dec. 31, 2012 Two Of The Subloans [Member] Second Loan Agreement [Member] First Loans [Member] | Dec. 31, 2012 Two Of The Subloans [Member] Loan Agreement With BNDES [Member] BRL | Dec. 31, 2012 Two Of The Subloans [Member] Loan Agreement With BNDES [Member] First Loans [Member] USD ($) | Dec. 31, 2012 Two Of The Subloans [Member] Loan Agreement With BNDES [Member] First Loans [Member] BRL | Dec. 31, 2012 Third Subloan [Member] Second Loan Agreement [Member] First Loans [Member] USD ($) | Dec. 31, 2012 Third Subloan [Member] Second Loan Agreement [Member] First Loans [Member] BRL | Dec. 31, 2012 Third Subloan [Member] Loan Agreement With BNDES [Member] BRL | Dec. 31, 2012 Revolving Credit Agreement [Member] USD ($) Y | Dec. 31, 2012 Revolving Credit Agreement [Member] Second Loan Agreement [Member] USD ($) | Dec. 31, 2012 Revolving Credit Agreement [Member] First Loan Agreement [Member] USD ($) | Dec. 31, 2012 Revolving Credit Agreement [Member] Two Term Loan Agreements [Member] Agreement | Dec. 31, 2012 Revolving Credit Agreement [Member] Third Loan Agreement [Member] USD ($) | Dec. 31, 2012 Revolving Credit Agreement [Member] Fourth Loan Agreement [Member] USD ($) | Dec. 31, 2012 Revolving Credit Agreement [Member] Fifth Loan Agreement [Member] USD ($) | Dec. 31, 2012 Revolving Credit Agreement [Member] Sixth Loan Agreement Member USD ($) | Dec. 31, 2011 Subloan Of $233 [Member] First Loans [Member] | Dec. 31, 2012 Subloan Of $233 [Member] First Loan Agreement [Member] First Loans [Member] USD ($) | Dec. 31, 2012 Subloan Of $233 [Member] First Loan Agreement [Member] First Loans [Member] BRL | Dec. 31, 2011 Subloan Of $233 [Member] First Loan Agreement [Member] First Loans [Member] USD ($) | Dec. 31, 2011 Subloan Of $233 [Member] First Loan Agreement [Member] First Loans [Member] BRL | Dec. 31, 2011 Subloan Of $15 [Member] First Loans [Member] | Dec. 31, 2012 Subloan Of $15 [Member] First Loan Agreement [Member] First Loans [Member] USD ($) | Dec. 31, 2012 Subloan Of $15 [Member] First Loan Agreement [Member] First Loans [Member] BRL | Dec. 31, 2011 Subloan Of $15 [Member] First Loan Agreement [Member] First Loans [Member] USD ($) | Dec. 31, 2011 Subloan Of $15 [Member] First Loan Agreement [Member] First Loans [Member] BRL | Mar. 31, 2008 Four Of The Subloans [Member] First Loan Agreement [Member] First Loans [Member] USD ($) | Mar. 31, 2008 Four Of The Subloans [Member] First Loan Agreement [Member] First Loans [Member] BRL | Dec. 31, 2012 Four Of The Subloans [Member] First Loan Agreement [Member] First Loans [Member] | Dec. 31, 2011 Four Of The Subloans [Member] First Loan Agreement [Member] First Loans [Member] | Jun. 30, 2008 Fifth Subloan [Member] First Loan Agreement [Member] First Loans [Member] USD ($) | Jun. 30, 2008 Fifth Subloan [Member] First Loan Agreement [Member] First Loans [Member] BRL | Dec. 31, 2012 Fifth Subloan [Member] First Loan Agreement [Member] First Loans [Member] | Dec. 31, 2011 Fifth Subloan [Member] First Loan Agreement [Member] First Loans [Member] | Dec. 31, 2012 Subloan Of $339 [Member] Second Loan Agreement [Member] First Loans [Member] USD ($) | Dec. 31, 2012 Subloan Of $339 [Member] Second Loan Agreement [Member] First Loans [Member] BRL | Dec. 31, 2011 Subloan Of $339 [Member] Second Loan Agreement [Member] First Loans [Member] USD ($) | Dec. 31, 2011 Subloan Of $339 [Member] Second Loan Agreement [Member] First Loans [Member] BRL | Dec. 31, 2012 Subloan Of $35 [Member] Second Loan Agreement [Member] First Loans [Member] USD ($) | Dec. 31, 2012 Subloan Of $35 [Member] Second Loan Agreement [Member] First Loans [Member] BRL | Dec. 31, 2011 Subloan Of $35 [Member] Second Loan Agreement [Member] First Loans [Member] USD ($) | Dec. 31, 2011 Subloan Of $35 [Member] Second Loan Agreement [Member] First Loans [Member] BRL | Jun. 30, 2008 Three Of The Subloans [Member] Loan Agreement With BNDES [Member] USD ($) | Jun. 30, 2008 Three Of The Subloans [Member] Loan Agreement With BNDES [Member] BRL | Aug. 31, 2012 Midwestern Disaster Area Revenue Bonds Series 2012 Due 2042 [Member] USD ($) | Dec. 31, 2012 Revolving Credit Facility [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of long-term debt maturing in year 2013 |  |  | $ 465 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of long-term debt maturing in year 2014 |  |  | 661 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of long-term debt maturing in year 2015 |  |  | 34 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of long-term debt maturing in year 2016 |  |  | 33 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of long-term debt maturing in year 2017 |  |  | 780 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments on long-term debt | 322 | 972 | 1,489 |  | 1,194 |  | 1,757 |  |  | 881 | 17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate of bonds | 6.00% |  | 4.75% | 4.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.40% |  |  |  |  | 5.375% |  | 6.00% | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instruments agreement date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | August 2012 |
Proceeds from issuance of bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 250 |
Restricted cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 248 |
Debt instruments maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2042 |
Restricted cash, current |  |  | 171 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument frequency of periodic payment |  |  | Semi-annually | Semi-annually |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption date of Bonds |  |  | Alcoa has the option through the loan agreement to redeem the Bonds, as a whole or in part, on or after August 1, 2022, on at least 30 days, but not more than 60 days | Alcoa has the option through the loan agreement to redeem the Bonds, as a whole or in part, on or after August 1, 2022, on at least 30 days, but not more than 60 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of principal amount repayment |  |  | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior debt securities issued under shelf registration statement |  |  | 1,250 |  | 1,250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds received from public debt offering |  |  | 972 |  | 1,256 |  | 1,126 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,241 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2021 |  |  |  |  | 2013 |  | 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | July 25, 2016
Early repayment of outstanding notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 881 |  | 101 |  |  | 284 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option to redeem notes, period prior to notice to holders, days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 | 60 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt repurchase price, percentage of aggregate principal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 101.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tender offer completed, debt amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate outstanding principal amount |  |  |  |  |  |  |  | 500 |  |  |  |  |  |  | 224 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 269 |  | 328 |  | 422 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 233 | 470 | 233 | 470 |  | 15 | 30 | 15 | 30 |  |  |  |  |  |  |  |  | 339 | 589 |  |  | 35 | 61 |  |  |  |  |  |
Purchase premiums repaid recorded as interest expense |  | 74 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps terminated, notional amount | 315 |  | 550 |  | 550 |  | 825 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain resulting from termination of interest rate swaps, recorded as interest expense |  |  | 33 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment on loan agreement |  |  | 85 | 177 |  |  |  |  |  |  |  | 374 | 650 |  |  |  |  | 248 | 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 397 | 687 |  |
Interest on subloans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 339 | 589 | 35 | 61 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 233 | 470 |  |  | 15 | 30 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term interest rate |  |  |  |  |  |  |  |  |  |  |  | 2.02% | 2.02% | 0.80% | 0.60% | 0.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.99% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% | 6.00% |  |  | 2.40% |  |  |  |  |  |  |  |  |  | 1.48% | 1.48% |  |
Weighted-average margin on long term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.13% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of average cost incurred in raising capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.56% | 3.59% |  |  |  |  |  |  |  |  |  |  |  |
Early repayment of outstanding borrowings |  |  | 20 | 38 | 5 | 9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51 | 102 | 131 | 209 |  | 3 | 7 | 7 | 11 |  |  |  |  |  |  |  |  | 176 | 356 | 67 | 113 | 22 | 46 | 7 | 11 |  |  |  |
Line of credit facility amount outstanding |  |  | 311 | 637 | 355 | 661 |  | 3,750 | 280 |  |  |  |  |  |  |  | 100 |  |  |  |  | 350 |  | 150 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 55 | 102 |  |  |  | 3 | 7 |  |  |  |  |  |  |  |  |  |  | 191 | 356 |  |  | 23 | 42 |  |  |  |
Weighted-average interest rate |  |  | 6.49% | 6.49% | 7.50% | 7.50% |  |  | 2.32% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.13% |  |  |  |  | 5.99% |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.99% | 7.99% |  |  | 5.61% | 5.61% |  |  |  |
Principal and interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 667 |  |  |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional borrowing amount |  |  | 7 | 13 | 5 | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin |  |  | 1.55% | 1.55% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding borrowings |  |  | 86 | 177 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate of outstanding borrowings |  |  | 6.55% | 6.55% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average outstanding commercial paper |  |  |  |  |  |  |  |  |  |  |  |  |  | 354 | 197 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity date, description |  |  |  |  |  |  |  |  |  |  |  |  |  | Matures at various times within one year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit sublimit under credit facility |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extension of maturity period |  |  | 1 year | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreed credit Facility amount |  |  | 3,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved credit facility amount |  |  | 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extended credit facility maturity date |  |  | July 25, 2017 | July 25, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees paid to maintain credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin on LIBOR loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% | 1.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,275 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term borrowings |  |  | 53 |  | 62 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable settlement arrangements |  |  | 48 |  | 53 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of revolving credit facility agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreed credit facility amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 640 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension contributions |  |  | 561 |  | 336 |  | 113 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin on LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.25% |  |  |  | 1.50% |  |  | 1.375% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of term loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200 |  |  | 150 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit expiration amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 | $ 150 |  | $ 100 | $ 140 | $ 100 | $ 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Sep. 30, 2013 | Mar. 31, 2013 |  | Sep. 30, 2013 | Oct. 31, 2013 | Dec. 31, 2013 | Dec. 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average maturity days |  |  |  |  |  |  |  |  | 172 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Debt instruments maturity date. + References No definition available. + Details
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- Definition Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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- Definition Costs incurred in connection with an unsolicited tender offer (one where the Entity being sought has not requested the offer). These would include costs relating to evaluation and dissemination of information regarding an unsolicited tender offer. A tender offer is a broad solicitation by an Entity or a third party to purchase a substantial percentage of another entity's shares or units for a limited period of time. The offer is at a fixed price, usually at a premium over the current market price, and is contingent on shareholders' tendering a fixed number of their shares or units. + References No definition available. + Details
Name: | us-gaap_UnsolicitedTenderOfferCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration