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Investments (Unrealized Loss Position and Insured by Financial Guarantor) (Details) (USD $)
In Millions

Jun. 30, 2011

Dec. 31, 2010

Total, Fair Value

$ 4,412

$ 6,954

Total, Unrealized Losses

(532)

(804)

Mortgage-backed Securities [Member] | Wrapped Securities [Member]

Total, Fair Value

307

Total, Unrealized Losses

(112)

Loss and Loss Adjustment Expense Reserves

5

^[1]

Asset-Backed Securities [Member] | Wrapped Securities [Member]

Total, Fair Value

425

Total, Unrealized Losses

(98)

Loss and Loss Adjustment Expense Reserves

16

^[1]

Wrapped Securities [Member]

Total, Fair Value

1,543

Total, Unrealized Losses

(278)

Loss and Loss Adjustment Expense Reserves

21

^[1]

Wrapped Securities [Member] | All Others [Member]

Total, Fair Value

582

Total, Unrealized Losses

(44)

Wrapped Securities [Member] | Corporate Obligations [Member]

Total, Fair Value

229

Total, Unrealized Losses

(24)

MBIA [Member] | Mortgage-backed Securities [Member]

Total, Fair Value

15

^[2]

Total, Unrealized Losses

(5)

^[2]

Loss and Loss Adjustment Expense Reserves

5

^[1],[2]

Mortgage-backed Securities [Member]

Total, Fair Value

849

Total, Unrealized Losses

126

Mortgage-backed Securities [Member] | All Others [Member]

Total, Fair Value

292

Total, Unrealized Losses

(107)

MBIA [Member] | Asset-Backed Securities [Member]

Total, Fair Value

332

^[2]

Total, Unrealized Losses

(78)

^[2]

Loss and Loss Adjustment Expense Reserves

16

^[1],[2]

Asset-Backed Securities [Member]

Total, Fair Value

698

Total, Unrealized Losses

251

Asset-Backed Securities [Member] | All Others [Member]

Total, Fair Value

93

Total, Unrealized Losses

(20)

MBIA [Member] | Corporate Obligations [Member]

Total, Fair Value

173

^[2]

Total, Unrealized Losses

(13)

^[2]

All Others [Member] | Corporate Obligations [Member]

Total, Fair Value

56

Total, Unrealized Losses

(11)

Corporate Obligations [Member]

Total, Fair Value

859

Total, Unrealized Losses

73

MBIA [Member] | All Others [Member]

Total, Fair Value

280

^[2]

Total, Unrealized Losses

(32)

^[2]

All Others [Member] | All Others [Member]

Total, Fair Value

302

Total, Unrealized Losses

$ (12)

[1]	- Insurance loss reserve estimates are based on the proportion of par value owned to the total amount of par value insured.
[2]	- Includes investments insured by MBIA Corp. and National.

X

- Definition

This item represents the excess of amortized cost basis over fair value of securities in a loss position and which are categorized neither as held-to-maturity nor trading securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 03-1
-Paragraph 21
-Subparagraph a
-Clause 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.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 17
-Subparagraph a
-Clause 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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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 03-1
-Paragraph 21
-Subparagraph a(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.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 17
-Subparagraph a(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.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563

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X

- Definition

Alternate concept name for the aggregate amount of policy reserves (provided for future obligations including unpaid claims and claims adjustment expenses) and policy benefits (liability for future policy benefits) as of the balance sheet date; grouped amount of all the liabilities associated with the company's insurance policies.

+ 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 210.7-03.13(a)(1))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9
-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 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 94-5
-Paragraph 11
-Subparagraph 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.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 7
-Section 03
-Paragraph 13
-Subparagraph a

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant