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Fair Value Of Financial Instruments (Narrative) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Gross par outstanding on insured derivatives | $ 74,200,000,000 |  |
Percentage of transactions valued using corporate spreads used | 51.00% |  |
Percentage of transactions valued using spread benchmarked from most relevant spread source | 42.00% |  |
Percentage of transactions valued using WARF sourced and/or ratings sourced credit spread | 80.00% |  |
Net insured derivative liabilities | (4,800,000,000) |  | (4,400,000,000)
Impact of including nonperformance risk in valuation of pre-tax net insured derivative liability | 5,700,000,000 |  | 12,100,000,000
Percentage of level 3 assets of total assets measured at fair value | 30.00% |  | 24.00%
Percentage of Level 3 liabilities of total liabilities measured at fair value | 77.00% |  | 78.00%
Transfers into Level 3 | 9,000,000 | [1] | 390,000,000
Asset/Liabilities Transfers, net | 456,000,000 |  |
Transfers out of Level 3 | 391,000,000 |  | 562,000,000
Transfers into Level 2 | 391,000,000 |  | 562,000,000
Transfers out of Level 2 | 456,000,000 |  | 390,000,000
Net unrealized losses related to the transfers into level 3 | 2,000,000 |  | 10,000,000
Net unrealized gains related to transfers into Level 3 | 32,000,000 |  |
Net unrealized gains related to the transfers out of level 3 |  |  | 120,000,000
BET Valuation Model [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Percentage of insured credit derivatives fair valued using the BET model | 76.00% |  |
Percentage of sector specific transactions valued using BET model | 7.00% |  |
Direct Price Model [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Percentage of insured credit derivatives value under direct price model | 24.00% |  |
Credit Derivatives [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Transfers into Level 3 | 8,000,000 | [1] |
Interest Rate Derivatives [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Transfers into Level 3 | 1,000,000 | [1] |
Insured Derivatives [Member] | MBIA Corp. [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Gross par outstanding on insured derivatives | 3,800,000,000 |  |
Insured Derivatives [Member] | CMBS And Commercial Mortgage Collateral [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Gross par outstanding on insured derivatives | 22,900,000,000 |  |
CDS Contracts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Gross par outstanding on insured derivatives | 67,100,000,000 |  |
CDS Contracts [Member] | Required Payment of Lost Principal [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Gross par outstanding on insured derivatives | 50,200,000,000 |  |
CDS Contracts [Member] | Required Interest Payments [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Gross par outstanding on insured derivatives | 16,900,000,000 |  |
Interest Rate Contract [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Gross par outstanding on insured derivatives | $ 7,100,000,000 |  |
[1] | Transferred in and out at the end of the period.

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