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Long-Term Incentive Plans (Outstanding And Exercisable Stock Options) (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Number of Options, Outstanding | 2,325,300 | 2,548,000 | 3,715,406 | 5,963,268
Number of Options, Exercisable | 2,325,300 | 1,798,000 | 1,752,311 |
Weighted Average Remaining Contractual Life in Years, Stock Options Outstanding | 8 months 15 days |  |  |
Weighted Average Exercise Price, Stock Options Outstanding | $ 6.3703 | $ 10.9888 | $ 20.6883 | $ 19.0485
Weighted Average Exercise Price, Stock Options Exercisable | $ 6.3703 | $ 13.466 | $ 38.512 |
Aggregate Intrinsic Value, Stock Options Outstanding | $ 4 |  |  |
Aggregate Intrinsic Value, Stock Options Exercisable | $ 4 |  |  |
$4.02-$57.71 [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 | $ 57.71 |  |  |
Number of Options, Outstanding | 2,287,500 |  |  |
Number of Options, Exercisable | 2,287,500 |  |  |
Weighted Average Remaining Contractual Life in Years, Stock Options Outstanding | 8 months 12 days |  |  |
Weighted Average Exercise Price, Stock Options Outstanding | $ 5.3922 |  |  |
Weighted Average Exercise Price, Stock Options Exercisable | $ 5.3922 |  |  |
Aggregate Intrinsic Value, Stock Options Outstanding | $ 4 |  |  |
Aggregate Intrinsic Value, Stock Options Exercisable | $ 4 |  |  |
$58.84-$70.86 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Average Exercise Price, Minimum | $ 58.84 |  |  |
Range of Average Exercise Price, Maximum | $ 70.86 |  |  |
Number of Options, Outstanding | 37,800 |  |  |
Number of Options, Exercisable | 37,800 |  |  |
Weighted Average Remaining Contractual Life in Years, Stock Options Outstanding | 1 year 4 months 2 days |  |  |
Weighted Average Exercise Price, Stock Options Outstanding | $ 65.5624 |  |  |
Weighted Average Exercise Price, Stock Options Exercisable | $ 65.5624 |  |  |
Options 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 Outstanding | 8 months 15 days |  |  |
Options Exercisable [Member] | $4.02-$57.71 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Weighted Average Remaining Contractual Life in Years, Stock Options Outstanding | 8 months 12 days |  |  |
Options Exercisable [Member] | $58.84-$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 Outstanding | 1 year 4 months 2 days |  |  |

X
- 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 + 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 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the 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 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 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 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance 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)(i) -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 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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- Definition The ceiling 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 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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- 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 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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