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Reconciliation of Numerators and Denominators of Earnings per Share Calculations (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Earnings Per Share [Abstract] |  |  |  |
Income from continuing operations |  | $ 343 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 261 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 315 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Less: Noncontrolling interests net income |  | 9 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 16 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 15 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Less: Preferred stock dividend requirements |  | 7 us-gaap_PreferredStockDividendsIncomeStatementImpact | 25 us-gaap_PreferredStockDividendsIncomeStatementImpact | 31 us-gaap_PreferredStockDividendsIncomeStatementImpact
Less: Preferred stock redemption premium | 232 us-gaap_PreferredStockRedemptionPremium |  | 232 us-gaap_PreferredStockRedemptionPremium |
Income from continuing operations available to common stockholders - Numerator basic |  | 327 dan_IncomeLossFromContinuingOperationsAvailableToCommonStockholdersBasic | (12)dan_IncomeLossFromContinuingOperationsAvailableToCommonStockholdersBasic | 269 dan_IncomeLossFromContinuingOperationsAvailableToCommonStockholdersBasic
Numerator diluted |  | 334 dan_IncomeLossFromContinuingOperationsAvailableToCommonStockholdersDiluted | (12)dan_IncomeLossFromContinuingOperationsAvailableToCommonStockholdersDiluted | 300 dan_IncomeLossFromContinuingOperationsAvailableToCommonStockholdersDiluted
Net income (loss) available to common stockholders |  | 312 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | (13)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 269 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Numerator diluted |  | $ 319 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ (13)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 300 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Weighted-average number of shares outstanding - Denominator basic |  | 158.0 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 146.4 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 148.0 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Employee compensation-related shares, including stock options |  | 1.2 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements |  | 2.0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Conversion of preferred stock |  | 14.3 us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock |  | 64.7 us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock
Denominator diluted |  | 173.5 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 146.4 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 214.7 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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- Definition Amount Of Income (Loss) From Continuing Operations After Deduction Of Those Portions Of Income Or Loss From Continuing Operations That Are Allocable To Noncontrolling Interests And After Preferred Stock Dividend Requirements. + References No definition available. + Details
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- Definition Amount of income (loss) from continuing operations available to common stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions. + References No definition available. + Details
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- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683 + Details
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible preferred stock using the if-converted method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 40 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1930-109256 + Details
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 28A -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1500-109256 + Details
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- Definition Amount of Net Income (Loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686 + Details
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- Definition Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1377-109256 + Details
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- Definition Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1377-109256 + Details
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- Definition The amount of preferred stock dividends that is an adjustment to net income apportioned to common stockholders. + References No definition available. + Details
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- Definition The excess of (1) fair value of the consideration transferred to the holders of the preferred stock over (2) the carrying amount of the preferred stock in the registrant's balance sheet, during the accounting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section S99 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27010884&loc=d3e42851-122695 + Details
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256 + Details
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