v2.4.0.6

Provision for Income Taxes - Expiration of Tax Credit Carryforwards (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012
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Income Tax Disclosure [Line Items] |
Tax credit carryforwards | $ 92
2013 Tax loss carryforwards [Member] |
Income Tax Disclosure [Line Items] |
Tax credit carryforwards |
2014 Tax Loss Carryforwards [Member] |
Income Tax Disclosure [Line Items] |
Tax credit carryforwards |
2015 Tax Loss Carryforwards [Member] |
Income Tax Disclosure [Line Items] |
Tax credit carryforwards |
2016 Tax Loss Carryforwards [Member] |
Income Tax Disclosure [Line Items] |
Tax credit carryforwards |
2017 Tax Loss Carryforwards [Member] |
Income Tax Disclosure [Line Items] |
Tax credit carryforwards |
2018-2022 Tax Loss Carryforwards [Member] |
Income Tax Disclosure [Line Items] |
Tax credit carryforwards |
Later Tax Loss Carryforwards [Member] |
Income Tax Disclosure [Line Items] |
Tax credit carryforwards | 10
Unlimited Tax Credit Loss Carryforwards [Member] |
Income Tax Disclosure [Line Items] |
Tax credit carryforwards | $ 82

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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 17 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 48 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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