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Long-Term Incentive Employee Compensation - Status of Stock Option and Restricted Stock Shares (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified | 2 Months Ended | 10 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2011 | Oct. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2010
Schedule Of Stock Options [Line Items] |  |  |  |
Beginning Balance, Weighted Average Exercise Price | $ 16.70 | $ 85.08 | $ 16.70 | $ 80.58
Stock Options Granted, Weighted Average Exercise Price | $ 20.28 | $ 115.36 | $ 22.80 | $ 106.60
Stock Options Exercised, Weighted Average Exercise Price | $ 13.87 | $ 76.27 | $ 15.35 | $ 62.90
Stock Options Canceled or Expired, Weighted Average Exercise Price |  | $ 92.76 | $ 17.21 | $ 97.56
Outstanding on Distribution Date before Equitable Adjustment, Weighted Average Exercise Price |  | $ 88.52 |  |
Outstanding on Distribution Date after Equitable Adjustment, Weighted Average Exercise Price |  | $ 16.18 |  |
Outstanding, Weighted Average Exercise Price | $ 16.70 | $ 16.70 | $ 18.46 | $ 85.08
Beginning Balance, Shares | 8.0 | 3.7 | 8.0 | 4.0
Stock Options Granted, Shares | 0.7 | 0.3 | 0.4 | 0.4
Stock Options Exercised, Shares | (0.7) | (0.7) | (3.8) | (0.6)
Stock Options Canceled or Expired, Shares |  | (1.3) | (0.3) | (0.1)
Outstanding on Distribution Date before Equitable Adjustment, Shares |  | 2.0 |  |
Outstanding on Distribution Date after Equitable Adjustment, Shares |  | 8.0 |  |
Stock Options Outstanding at the end of Year, Shares | 8.0 | 8.0 | 4.3 | 3.7
Stock Options Exercisable at the end of year, Shares | 6.3 |  | 2.9 | 3.0
Stock Options Exercisable at the end of year, Weighted Average Exercise Price | $ 16.03 |  | $ 17.10 | $ 83.72

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the 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)(iii) -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Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(c), d(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 For presentations that combine terminations, 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 or that expired. + 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)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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