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Variable Interest Entities (Summary Of Nonconsolidated VIEs Assets And Liabilities) (Detail) - USD ($)
$ in Millions

Mar. 31, 2016

Dec. 31, 2015

Variable Interest Entity [Line Items]

Insurance loss recoverable

$ 409

$ 577

Global Structured Finance [Member]

Variable Interest Entity [Line Items]

VIE Assets

26,237

28,311

Maximum Exposure to Loss

13,215

14,495

Investments

^[1]

73

74

Premiums receivable

^[2]

71

80

Insurance loss recoverable

^[3]

401

418

Unearned premium revenue

^[4]

68

78

Loss and loss adjustment expense reserves

^[5]

414

418

Derivative liabilities

^[6]

4

6

Global Structured Finance [Member] | Collateralized Debt Obligations [Member]

Variable Interest Entity [Line Items]

VIE Assets

5,071

5,712

Maximum Exposure to Loss

2,554

3,046

Investments

^[1]

51

51

Premiums receivable

^[2]

6

9

Unearned premium revenue

^[4]

3

6

Loss and loss adjustment expense reserves

^[5]

71

108

Derivative liabilities

^[6]

4

6

Global Structured Finance [Member] | Residential Mortgage Backed Securities [Member]

Variable Interest Entity [Line Items]

VIE Assets

11,066

11,524

Maximum Exposure to Loss

5,817

6,072

Investments

^[1]

22

23

Premiums receivable

^[2]

31

31

Insurance loss recoverable

^[3]

399

416

Unearned premium revenue

^[4]

30

30

Loss and loss adjustment expense reserves

^[5]

334

306

Global Structured Finance [Member] | Commercial Mortgage Backed Securities [Member]

Variable Interest Entity [Line Items]

VIE Assets

309

319

Maximum Exposure to Loss

206

219

Premiums receivable

^[2]

1

1

Unearned premium revenue

^[4]

0

1

Global Structured Finance [Member] | Consumer Asset Backed [Member]

Variable Interest Entity [Line Items]

VIE Assets

5,370

5,538

Maximum Exposure to Loss

1,535

1,712

Premiums receivable

^[2]

9

13

Unearned premium revenue

^[4]

7

11

Loss and loss adjustment expense reserves

^[5]

9

4

Global Structured Finance [Member] | Corporate Asset Backed [Member]

Variable Interest Entity [Line Items]

VIE Assets

4,421

5,218

Maximum Exposure to Loss

3,103

3,446

Premiums receivable

^[2]

24

26

Insurance loss recoverable

^[3]

2

2

Unearned premium revenue

^[4]

28

30

Global Public Finance [Member]

Variable Interest Entity [Line Items]

VIE Assets

47,741

44,162

Maximum Exposure to Loss

14,291

14,579

Premiums receivable

^[2]

154

160

Unearned premium revenue

^[4]

179

186

Total Insurance [Member]

Variable Interest Entity [Line Items]

VIE Assets

73,978

72,473

Maximum Exposure to Loss

27,506

29,074

Investments

^[1]

73

74

Premiums receivable

^[2]

225

240

Insurance loss recoverable

^[3]

401

418

Unearned premium revenue

^[4]

247

264

Loss and loss adjustment expense reserves

^[5]

414

418

Derivative liabilities

^[6]

$ 4

$ 6

[1]	Reported within Investments on MBIA's consolidated balance sheets.
[2]	Reported within Premiums receivable on MBIA's consolidated balance sheets.
[3]	Reported within Insurance loss recoverable on MBIA's consolidated balance sheets.
[4]	Reported within Unearned premium revenue on MBIA's consolidated balance sheets.
[5]	Reported within Loss and loss adjustment expense reserves on MBIA's consolidated balance sheets.
[6]	Reported within Derivative liabilities on MBIA's consolidated balance sheets.

X

- Definition

Carrying amount as of the balance sheet date of paid insurance policy claims and LAE expense expected to be recovered.

+ References

No definition available.

+ Details

Name:	mbi_InsuranceLossRecoverable
Namespace Prefix:	mbi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

+ Details

Name:	us-gaap_DerivativeLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(h))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (a),(b),(c)
-URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437

+ Details

Name:	us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The carrying amount as of the balance sheet date due the entity from (a) agents and insureds, (b) uncollected premiums and (c) others, net of the allowance for doubtful accounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.(a),5)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_PremiumsReceivableAtCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Carrying amount of premiums written on insurance contracts that have not been earned as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.(a),13(a)(2))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 16
-Article 12

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph b
-URI http://asc.fasb.org/extlink&oid=52262685&loc=d3e5728-111685

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=52262685&loc=d3e5747-111685

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_VariableInterestEntityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph a
-URI http://asc.fasb.org/extlink&oid=52262685&loc=d3e5728-111685

+ Details

Name:	us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_GuaranteeObligationsByNatureAxis=mbi_GlobalStructuredFinanceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_UnderlyingAssetClassAxis=us-gaap_CollateralizedDebtObligationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_UnderlyingAssetClassAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_UnderlyingAssetClassAxis=us-gaap_CommercialMortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_UnderlyingAssetClassAxis=mbi_ConsumerAssetBackedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_UnderlyingAssetClassAxis=mbi_CorporateAssetBackedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_GuaranteeObligationsByNatureAxis=mbi_GlobalPublicFinanceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_GuaranteeObligationsByNatureAxis=mbi_TotalInsuranceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: