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Segment and Geographic Area Information - Schedule of Geographic Information for Long-Lived Assets (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets | $ 18,947 | $ 19,282
U.S. [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets | 4,621 | 4,439
Brazil [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets | 4,318 | 4,844
Australia [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets | 3,548 | 3,390
Iceland [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets | 1,571 | 1,615
Canada [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets | 1,399 | 1,447
Norway [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets | 898 | 894
Russia [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets | 494 | 531
Spain [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets | 445 | 451
Jamaica [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets | 414 | 417
China [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets | 395 | 424
Other Geographical Regions [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets | $ 844 | $ 830

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- Definition Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 12 -Paragraph 5 -Subparagraph b, c -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 FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 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 210.5-02.13) -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 13 -Subparagraph a -Article 5 + Details
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