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Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share) (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Basic earnings per share: [Abstract]      
Net income (loss) $ 569us-gaap_NetIncomeLoss $ 250us-gaap_NetIncomeLoss $ 1,234us-gaap_NetIncomeLoss
Less: Undistributed earnings allocated to participating securities 16us-gaap_UndistributedEarningsAllocatedToParticipatingSecurities 5us-gaap_UndistributedEarningsAllocatedToParticipatingSecurities 32us-gaap_UndistributedEarningsAllocatedToParticipatingSecurities
Net income (loss) available to common stockholders 553us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 245us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 1,202us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Basic weighted average shares 188,171,503us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [1] 189,071,011us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [1] 188,834,626us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [1]
Net income (loss) per basic common share $ 2.94us-gaap_EarningsPerShareBasic $ 1.3us-gaap_EarningsPerShareBasic $ 6.36us-gaap_EarningsPerShareBasic
Diluted earnings per share: [Abstract]      
Net income (loss) 569us-gaap_NetIncomeLoss 250us-gaap_NetIncomeLoss 1,234us-gaap_NetIncomeLoss
Less: Undistributed earnings allocated to participating securities 15mbi_UndistributedEarningsAllocatedToParticipatingSecuritiesDiluted 5mbi_UndistributedEarningsAllocatedToParticipatingSecuritiesDiluted 32mbi_UndistributedEarningsAllocatedToParticipatingSecuritiesDiluted
Less: mark-to-market gain (loss) on warrants 28us-gaap_FairValueAdjustmentOfWarrants 0us-gaap_FairValueAdjustmentOfWarrants 0us-gaap_FairValueAdjustmentOfWarrants
Net income (loss) available to common stockholders $ 526us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 245us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 1,202us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Basic weighted average shares 188,171,503us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [1] 189,071,011us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [1] 188,834,626us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [1]
Stock options 1,104,247us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 1,241,902us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 1,062,395us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Warants 1,622,877us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants 0us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants 0us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants
Diluted weighted average shares 190,898,627us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 190,312,913us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 189,897,021us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income (loss) per diluted common share $ 2.76us-gaap_EarningsPerShareDiluted $ 1.29us-gaap_EarningsPerShareDiluted $ 6.33us-gaap_EarningsPerShareDiluted
Unvested Restricted Stock And Units That Receive Nonforfeitable Dividends Or Dividend Equivalents That Have Met Service Condition 412,769mbi_UnvestedRestrictedStockAndUnitsThatReceiveNonforfeitableDividendsOrDividendEquivalentsThatHaveMetServiceCondition 629,896mbi_UnvestedRestrictedStockAndUnitsThatReceiveNonforfeitableDividendsOrDividendEquivalentsThatHaveMetServiceCondition 506,714mbi_UnvestedRestrictedStockAndUnitsThatReceiveNonforfeitableDividendsOrDividendEquivalentsThatHaveMetServiceCondition
[1]
Includes 412,769, 629,896 and 506,714 of participating securities that met the service condition and were eligible to receive nonforfeitable dividends or dividend equivalents for the years ended December 31, 2014, 2013 and 2012, respectively.