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Financial Instruments - Schedule of Company's Financial Assets and Liabilities (Detail) In Millions, unless otherwise specified | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2012 Foreign Exchange Contract [Member] USD ($) | Dec. 31, 2011 Foreign Exchange Contract [Member] USD ($) | Dec. 31, 2012 Commodity Contract [Member] USD ($) | Dec. 31, 2011 Commodity Contract [Member] USD ($) | Dec. 31, 2012 Prepaid Expenses [Member] Foreign Exchange Contract [Member] USD ($) | Dec. 31, 2011 Prepaid Expenses [Member] Foreign Exchange Contract [Member] USD ($) | Dec. 31, 2012 Prepaid Expenses [Member] Commodity Contract [Member] USD ($) | Dec. 31, 2012 Other Assets [Member] Foreign Exchange Contract [Member] USD ($) | Dec. 31, 2011 Other Assets [Member] Foreign Exchange Contract [Member] USD ($) | Dec. 31, 2012 Other Accrued Liabilities [Member] Foreign Exchange Contract [Member] USD ($) | Dec. 31, 2011 Other Accrued Liabilities [Member] Foreign Exchange Contract [Member] USD ($) | Dec. 31, 2012 Other Accrued Liabilities [Member] Commodity Contract [Member] USD ($) | Dec. 31, 2011 Other Accrued Liabilities [Member] Commodity Contract [Member] USD ($) | Dec. 31, 2012 Other Long Term Liabilities [Member] Foreign Exchange Contract [Member] USD ($) | Dec. 31, 2011 Other Long Term Liabilities [Member] Foreign Exchange Contract [Member] USD ($) | Dec. 31, 2012 Other Long Term Liabilities [Member] Commodity Contract [Member] USD ($) | Dec. 31, 2011 Other Long Term Liabilities [Member] Commodity Contract [Member] USD ($) | Dec. 31, 2012 Cash and Cash Equivalents [Member] USD ($) | Dec. 31, 2011 Cash and Cash Equivalents [Member] USD ($) | Dec. 31, 2012 Asset-backed Securities [Member] USD ($) | Dec. 31, 2012 Asset-backed Securities [Member] CAD | Dec. 31, 2011 Asset-backed Securities [Member] USD ($) | Dec. 31, 2011 Asset-backed Securities [Member] CAD
Held-for-trading |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trading securities | $ 1,612 | $ 1,407 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,522 | $ 1,325 | $ 90 | 90 | $ 82 | 84
Held-to-maturity investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Severance investments | 8 | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investments | 9 | 12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans and receivables |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable | 4,774 | 4,398 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term receivables included in other assets [note 12] | 95 | 176 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total | 4,869 | 4,574 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other financial liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank indebtedness | 71 | 36 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt (including portion due within one year) | 361 | 197 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable | 4,450 | 3,961 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total | 4,882 | 4,194 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives designated as effective hedges, measured at fair value, Assets |  |  |  |  |  |  | 37 | 21 |  | 32 | 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives designated as effective hedges, measured at fair value, Total | 47 | (42) | 49 | (33) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives designated as effective hedges, measured at fair value, Liabilities |  |  |  |  | $ (2) | $ (9) |  |  | $ 2 |  |  | $ (11) | $ (31) | $ (3) | $ (6) | $ (9) | $ (38) | $ (1) | $ (3) |  |  |  |  |  |

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- Definition The total of financial instruments that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for debt and equity securities formerly categorized as available-for-sale or held-to-maturity which the entity held as of the date it opted to account for such securities at fair value. An enterprise may also categorize such a security as trading without the intent to sell it in the near term assuming the decision to categorize the security as trading occurred at acquisition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph a -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 29 -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 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Implementation Guide (Q and A) -Number FAS115 -Paragraph 35 -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. + Details
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