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Stock-Based Compensation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Common stock available for granting stock options and other long-term stock incentive awards | 10,718,100 |  |
Total unrecognized compensation expense | $ 15 | $ 33 | $ 45
Remaining weighted average vesting period in years | 2 years | 3 years | 3 years
Total market value (at the vesting date) of stock award shares | 27 | 28 | 22
Stock awards granted subsequent to January 1, 2010 have a vesting period, in years | five |  |
Grant and expire date | No later than 10 years |  |
Stock option shares forfeited | 6,000,000 | 3,000,000 | 4,000,000
Compensation expense recognized over the vesting period | 5 years | 5 years | 6 years
Stock award shares granted | 1,000,000 | 2,000,000 | 3,000,000
Phantom Stock Awards [Member] |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Expense (income) related to valuation | 7 | 2 | 2
Stock award shares granted | 162,310 | 349,550 | 299,650
Fair value of stock appreciation rights granted | 2 | 4 | 4
Cash paid to settle phantom stock awards | 3 | 2 | 1
Stock Appreciation Rights [Member] |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Expense (income) related to valuation | 4 | (1) | 1
Stock award shares granted |  |  | 429,300
Fair value of stock appreciation rights granted |  |  | 2
Stock Option [Member] |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Stock option shares granted | 1,080,750 |  |
Grant date exercise price per share | $ 12 |  |
Stock option shares forfeited | 5,894,710 |  |
Compensation Expense [Member] |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Compensation expense recognized over the vesting period | 5 years |  |
Minimum [Member] | Phantom Stock Awards [Member] |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Compensation expense recognized over the vesting period | 5 years |  |
Maximum [Member] | Phantom Stock Awards [Member] |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Compensation expense recognized over the vesting period | 10 years |  |
Unvested Awards [Member] |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Total unrecognized compensation expense | $ 72 | $ 107 | $ 127
Remaining weighted average vesting period in years | 4 years | 4 years | 5 years

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- Definition Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph j -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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- Definition As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph h -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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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(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. + Details
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- Definition The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(2) -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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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(f) -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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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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