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Long-Term Incentive Plans (Outstanding Stock Options) (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Mar. 31, 2010 | Dec. 31, 2009
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |
Number of Options, Outstanding | 5,963,268 | 6,425,073 | 6,650,947 |  | 7,044,820
Number of Options, Exercisable | 1,751,173 | 2,211,878 | 2,050,252 |  |
Weighted Average Remaining Contractual Life in Years, Stock Options Outstanding | 2 years 7 months 6 days |  |  |  |
Weighted Average Exercise Price, Stock Options Outstanding | $ 19.0485 | $ 21.3330 | $ 22.1713 |  | $ 25.3110
Weighted Average Exercise Price, Stock Options Exercisable | $ 45.0174 | $ 46.1478 | $ 53.1172 | $ 5.05 |
Aggregate Intrinsic Value, Stock Options Outstanding | $ 9 |  |  |  |
$4.02-$12.50 [Member] |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |
Range of Average Exercise Price, Minimum | $ 4.02 |  |  |  |
Range of Average Exercise Price, Maximum | $ 12.50 |  |  |  |
Number of Options, Outstanding | 4,550,000 |  |  |  |
Number of Options, Exercisable | 350,000 |  |  |  |
Weighted Average Remaining Contractual Life in Years, Stock Options Outstanding | 3 years 11 days |  |  |  |
Weighted Average Exercise Price, Stock Options Outstanding | $ 7.8101 |  |  |  |
Aggregate Intrinsic Value, Stock Options Outstanding | 9 |  |  |  |
$36.69-$55.60 [Member] |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |
Range of Average Exercise Price, Minimum | $ 36.69 |  |  |  |
Range of Average Exercise Price, Maximum | $ 55.60 |  |  |  |
Number of Options, Outstanding | 409,707 |  |  |  |
Number of Options, Exercisable | 401,612 |  |  |  |
Weighted Average Remaining Contractual Life in Years, Stock Options Outstanding | 3 months 22 days |  |  |  |
Weighted Average Exercise Price, Stock Options Outstanding | $ 39.7103 |  |  |  |
$57.10-$70.86 [Member] |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |
Range of Average Exercise Price, Minimum | $ 57.10 |  |  |  |
Range of Average Exercise Price, Maximum | $ 70.86 |  |  |  |
Number of Options, Outstanding | 1,003,561 |  |  |  |
Number of Options, Exercisable | 999,561 |  |  |  |
Weighted Average Remaining Contractual Life in Years, Stock Options Outstanding | 1 year 7 months 10 days |  |  |  |
Weighted Average Exercise Price, Stock Options Outstanding | $ 61.5665 |  |  |  |
Exercisable [Member] |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |
Weighted Average Remaining Contractual Life in Years, Stock Options Exercisable | 1 year 7 months 13 days |  |  |  |
Weighted Average Exercise Price, Stock Options Exercisable | $ 45.0174 |  |  |  |
Aggregate Intrinsic Value, Stock Options Exercisable | 1 |  |  |  |
Exercisable [Member] | $4.02-$12.50 [Member] |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |
Weighted Average Remaining Contractual Life in Years, Stock Options Exercisable | 3 years 1 month 13 days |  |  |  |
Weighted Average Exercise Price, Stock Options Exercisable | $ 4.0200 |  |  |  |
Aggregate Intrinsic Value, Stock Options Exercisable | $ 1 |  |  |  |
Exercisable [Member] | $36.69-$55.60 [Member] |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |
Weighted Average Remaining Contractual Life in Years, Stock Options Exercisable | 3 months 26 days |  |  |  |
Weighted Average Exercise Price, Stock Options Exercisable | $ 39.5601 |  |  |  |
Exercisable [Member] | $57.10-$70.86 [Member] |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |
Weighted Average Remaining Contractual Life in Years, Stock Options Exercisable | 1 year 7 months 13 days |  |  |  |
Weighted Average Exercise Price, Stock Options Exercisable | $ 61.5654 |  |  |  |

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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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 The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under 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)(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) -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 Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 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 d(1) -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 reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(b) -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 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(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. + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -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 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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