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Financial Instruments and Risk Management - Schedule of Assets (Liabilities) Measured at Fair Value on Non-Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Assets held for sale | $ 16
Total assets |
Fair Value, Inputs, Level 1 [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Assets held for sale |
Total assets |
Fair Value, Inputs, Level 2 [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Assets held for sale |
Total assets |
Fair Value, Inputs, Level 3 [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Assets held for sale | 16
Total assets |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Fair value portion of assets classified as held for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258 + Details
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Balance Type: | debit
Period Type: | instant

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- Details
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