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Fair Value Measurements - Summary of Carrying Amount and Fair Value of Ambac's Financial Assets and Liabilities (Detail) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | $ 3,037 |
Financial assets: |  |
Short term investments | 586 | $ 653
Other investments | 363 | 478
Derivative assets | 89 | 75
Other assets | 3 | 3
Long-term Debt | 2,760 | 2,822
Financial liabilities: |  |
Derivative liabilities | 138 | 90
Variable Interest Entity, Primary Beneficiary [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 2,928 | 3,121
Financial assets: |  |
Loans | 2,932 | 3,108
Derivative assets | 62 | 52
Long-term Debt | 4,263 | 4,554
Financial liabilities: |  |
Derivative liabilities | 1,610 | 1,657
Long-term debt | 4,092 | 4,351
Short-term Investments [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 586 | 653
Corporate Debt Securities [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 2,806 | 2,957
Municipal Bonds [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 122 | 164
Total Fair Value [Member] |  |
Financial assets: |  |
Cash | 89 | 79
Reported Value Measurement [Member] |  |
Financial assets: |  |
Cash | 89 | 79
Loans | 10 |
Other assets | 3 | 3
Total financial assets | 9,513 | 10,242
Financial liabilities: |  |
Liabilities for net financial guarantees written | (763) | (863)
Long-term debt | 3,217 | 3,262
Total financial liabilities | 8,464 | 8,699
Reported Value Measurement [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial assets: |  |
Restricted Cash and Cash Equivalents, Current | 2 | 2
Loans | 2,932 | 3,108
Financial liabilities: |  |
Long-term debt | 4,263 | 4,554
Reported Value Measurement [Member] | Short-term Investments [Member] |  |
Financial assets: |  |
Short term investments | 586 | 653
Reported Value Measurement [Member] | Other Debt Obligations [Member] |  |
Financial assets: |  |
Other investments | 363 | 478
Reported Value Measurement [Member] | Corporate Debt Securities [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 2,806 | 2,957
Reported Value Measurement [Member] | Municipal Bonds [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 122 | 164
Reported Value Measurement [Member] | Interest Rate Swap [Member] |  |
Financial liabilities: |  |
Derivative liabilities - interest rate swaps - asset position | 1 |
Derivative liabilities | 136 | 89
Reported Value Measurement [Member] | Interest Rate Swap [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 1,610 | 1,657
Reported Value Measurement [Member] | Currency Swaps [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial assets: |  |
Derivative assets | 62 | 52
Reported Value Measurement [Member] | Other Credit Derivatives [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 2 |
Other Assets [Member] | Reported Value Measurement [Member] | Interest Rate Swap [Member] |  |
Financial assets: |  |
Derivative assets | 89 | 75
Interest Rate Swaps - Liability Position [Member] | Reported Value Measurement [Member] | Interest Rate Swap [Member] |  |
Financial assets: |  |
Derivative Asset, Fair Value, Gross Liability | 1 |
Level 1 [Member] |  |
Financial assets: |  |
Cash | 86 | 70
Total financial assets | 1,004 | 1,091
Financial liabilities: |  |
Liabilities for net financial guarantees written | 0 | 0
Long-term debt | 0 | 0
Total financial liabilities | 0 | 0
Level 1 [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial assets: |  |
Restricted Cash and Cash Equivalents, Current | 2 | 2
Loans | 0 | 0
Financial liabilities: |  |
Long-term debt | 0 | 0
Level 1 [Member] | Short-term Investments [Member] |  |
Financial assets: |  |
Short term investments | 528 | 598
Level 1 [Member] | Equity Method Investments [Member] |  |
Financial assets: |  |
Other assets | 0 | 0
Level 1 [Member] | Loans Receivable [Member] |  |
Financial assets: |  |
Loans | 0 |
Level 1 [Member] | Other Debt Obligations [Member] |  |
Financial assets: |  |
Other investments | 84 | 136
Level 1 [Member] | Corporate Debt Securities [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 0 | 0
Level 1 [Member] | Municipal Bonds [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 0 | 0
Level 1 [Member] | Interest Rate Swap [Member] |  |
Financial liabilities: |  |
Derivative liabilities - interest rate swaps - asset position | 0 |
Derivative liabilities | 0 | 0
Level 1 [Member] | Interest Rate Swap [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 0 | 0
Level 1 [Member] | Currency Swaps [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial assets: |  |
Derivative assets | 0 | 0
Level 1 [Member] | Other Credit Derivatives [Member] |  |
Financial assets: |  |
Derivative assets | 0 |
Financial liabilities: |  |
Derivative liabilities | 0 |
Level 1 [Member] | Other Assets [Member] | Interest Rate Swap [Member] |  |
Financial assets: |  |
Derivative assets | 0 | 0
Level 1 [Member] | Interest Rate Swaps - Liability Position [Member] | Interest Rate Swap [Member] |  |
Financial assets: |  |
Derivative Asset, Fair Value, Gross Liability | 0 |
Level 2 [Member] |  |
Financial assets: |  |
Cash | 3 | 9
Total financial assets | 2,335 | 2,593
Financial liabilities: |  |
Liabilities for net financial guarantees written | 0 | 0
Long-term debt | 2,584 | 2,829
Total financial liabilities | 8,444 | 8,983
Level 2 [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial assets: |  |
Restricted Cash and Cash Equivalents, Current | 0 | 0
Loans | 0 | 0
Financial liabilities: |  |
Long-term debt | 4,115 | 4,408
Level 2 [Member] | Short-term Investments [Member] |  |
Financial assets: |  |
Short term investments | 57 | 55
Level 2 [Member] | Equity Method Investments [Member] |  |
Financial assets: |  |
Other assets | 0 | 0
Level 2 [Member] | Loans Receivable [Member] |  |
Financial assets: |  |
Loans | 0 |
Level 2 [Member] | Other Debt Obligations [Member] |  |
Financial assets: |  |
Other investments | 0 | 0
Level 2 [Member] | Corporate Debt Securities [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 0 | 0
Level 2 [Member] | Municipal Bonds [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 122 | 164
Level 2 [Member] | Interest Rate Swap [Member] |  |
Financial liabilities: |  |
Derivative liabilities - interest rate swaps - asset position | 1 |
Derivative liabilities | 136 | 89
Level 2 [Member] | Interest Rate Swap [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 1,610 | 1,657
Level 2 [Member] | Currency Swaps [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial assets: |  |
Derivative assets | 62 | 52
Level 2 [Member] | Other Credit Derivatives [Member] |  |
Financial assets: |  |
Derivative assets |  |
Financial liabilities: |  |
Derivative liabilities | 0 |
Level 2 [Member] | Other Assets [Member] | Interest Rate Swap [Member] |  |
Financial assets: |  |
Derivative assets | 10 | 8
Level 2 [Member] | Interest Rate Swaps - Liability Position [Member] | Interest Rate Swap [Member] |  |
Financial assets: |  |
Derivative Asset, Fair Value, Gross Liability | 1 |
Level 3 [Member] |  |
Financial assets: |  |
Cash | 0 | 0
Total financial assets | 5,927 | 6,281
Financial liabilities: |  |
Liabilities for net financial guarantees written | 1,057 | 284
Long-term debt | 341 | 445
Total financial liabilities | 1,558 | 889
Level 3 [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial assets: |  |
Restricted Cash and Cash Equivalents, Current | 0 | 0
Loans | 2,932 | 3,108
Financial liabilities: |  |
Long-term debt | 158 | 159
Level 3 [Member] | Short-term Investments [Member] |  |
Financial assets: |  |
Short term investments | 0 | 0
Level 3 [Member] | Equity Method Investments [Member] |  |
Financial assets: |  |
Other assets | 3 | 3
Level 3 [Member] | Loans Receivable [Member] |  |
Financial assets: |  |
Loans | 11 |
Level 3 [Member] | Other Debt Obligations [Member] |  |
Financial assets: |  |
Other investments | 30 | 61
Level 3 [Member] | Corporate Debt Securities [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 2,806 | 2,957
Level 3 [Member] | Municipal Bonds [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 0 | 0
Level 3 [Member] | Interest Rate Swap [Member] |  |
Financial liabilities: |  |
Derivative liabilities - interest rate swaps - asset position | 0 |
Derivative liabilities | 0 | 0
Level 3 [Member] | Interest Rate Swap [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 0 | 0
Level 3 [Member] | Currency Swaps [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial assets: |  |
Derivative assets | 0 | 0
Level 3 [Member] | Other Credit Derivatives [Member] |  |
Financial assets: |  |
Derivative assets |  |
Financial liabilities: |  |
Derivative liabilities | 2 |
Level 3 [Member] | Other Assets [Member] | Interest Rate Swap [Member] |  |
Financial assets: |  |
Derivative assets | 79 | 67
Level 3 [Member] | Interest Rate Swaps - Liability Position [Member] | Interest Rate Swap [Member] |  |
Financial assets: |  |
Derivative Asset, Fair Value, Gross Liability | 0 |
Commercial Mortgage Backed Securities [Member] | Reported Value Measurement [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 51 | 50
Municipal Bonds [Member] | Reported Value Measurement [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 218 | 215
Corporate Debt Securities [Member] | Reported Value Measurement [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 1,261 | 1,430
Debt Security, Government, Non-US [Member] | Reported Value Measurement [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 42 | 44
US Government Debt Securities [Member] | Reported Value Measurement [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 177 | 156
Residential Mortgage-Backed Securities [Member] | Reported Value Measurement [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 203 | 248
Collateralized Debt Obligations [Member] | Reported Value Measurement [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 132 | 146
Asset-backed Securities [Member] | Reported Value Measurement [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 283 | 287
Fair Value, Recurring [Member] |  |
Financial assets: |  |
Total financial assets | 9,498 | 10,260
Financial liabilities: |  |
Liabilities for net financial guarantees written | 1,057 | 284
Long-term debt | 2,924 | 3,274
Total financial liabilities | 10,001 | 9,872
Fair Value, Recurring [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial assets: |  |
Restricted Cash and Cash Equivalents, Current | 2 | 2
Loans | 2,932 | 3,108
Financial liabilities: |  |
Long-term debt | 4,274 | 4,567
Fair Value, Recurring [Member] | Commercial Mortgage Backed Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 51 | 50
Fair Value, Recurring [Member] | Short-term Investments [Member] |  |
Financial assets: |  |
Short term investments | 586 | 653
Fair Value, Recurring [Member] | Equity Method Investments [Member] |  |
Financial assets: |  |
Other assets | 3 | 3
Fair Value, Recurring [Member] | Loans Receivable [Member] |  |
Financial assets: |  |
Loans | 11 |
Fair Value, Recurring [Member] | Other Debt Obligations [Member] |  |
Financial assets: |  |
Other investments | 345 | 493
Fair Value, Recurring [Member] | Asset-backed Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 283 | 287
Fair Value, Recurring [Member] | Collateralized Debt Obligations [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 132 | 146
Fair Value, Recurring [Member] | Residential Mortgage-Backed Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 203 | 248
Fair Value, Recurring [Member] | US Government Debt Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 177 | 156
Fair Value, Recurring [Member] | Debt Security, Government, Non-US [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 42 | 44
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 1,261 | 1,430
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 2,806 | 2,957
Fair Value, Recurring [Member] | Municipal Bonds [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 218 | 215
Fair Value, Recurring [Member] | Municipal Bonds [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 122 | 164
Fair Value, Recurring [Member] | Interest Rate Swap [Member] |  |
Financial liabilities: |  |
Derivative liabilities - interest rate swaps - asset position | 1 |
Derivative liabilities | 136 | 89
Fair Value, Recurring [Member] | Interest Rate Swap [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 1,610 | 1,657
Fair Value, Recurring [Member] | Currency Swaps [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial assets: |  |
Derivative assets | 62 | 52
Fair Value, Recurring [Member] | Other Credit Derivatives [Member] |  |
Financial assets: |  |
Derivative assets | 0 |
Financial liabilities: |  |
Derivative liabilities | 2 |
Fair Value, Recurring [Member] | Other Assets [Member] | Interest Rate Swap [Member] |  |
Financial assets: |  |
Derivative assets | 89 | 75
Fair Value, Recurring [Member] | Interest Rate Swaps - Liability Position [Member] | Interest Rate Swap [Member] |  |
Financial assets: |  |
Derivative Asset, Fair Value, Gross Liability | 1 |
Fair Value, Recurring [Member] | Level 1 [Member] | Commercial Mortgage Backed Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 0 | 0
Fair Value, Recurring [Member] | Level 1 [Member] | Asset-backed Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 0 | 0
Fair Value, Recurring [Member] | Level 1 [Member] | Collateralized Debt Obligations [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 0 | 0
Fair Value, Recurring [Member] | Level 1 [Member] | Residential Mortgage-Backed Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 0 | 0
Fair Value, Recurring [Member] | Level 1 [Member] | US Government Debt Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 177 | 156
Fair Value, Recurring [Member] | Level 1 [Member] | Debt Security, Government, Non-US [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 42 | 44
Fair Value, Recurring [Member] | Level 1 [Member] | Corporate Debt Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 0 | 0
Fair Value, Recurring [Member] | Level 1 [Member] | Municipal Bonds [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 0 | 0
Fair Value, Recurring [Member] | Level 2 [Member] | Commercial Mortgage Backed Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 51 | 50
Fair Value, Recurring [Member] | Level 2 [Member] | Asset-backed Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 217 | 215
Fair Value, Recurring [Member] | Level 2 [Member] | Collateralized Debt Obligations [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 132 | 146
Fair Value, Recurring [Member] | Level 2 [Member] | Residential Mortgage-Backed Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 203 | 248
Fair Value, Recurring [Member] | Level 2 [Member] | US Government Debt Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 0 | 0
Fair Value, Recurring [Member] | Level 2 [Member] | Debt Security, Government, Non-US [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 0 | 0
Fair Value, Recurring [Member] | Level 2 [Member] | Corporate Debt Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 1,261 | 1,430
Fair Value, Recurring [Member] | Level 2 [Member] | Municipal Bonds [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 218 | 215
Fair Value, Recurring [Member] | Level 3 [Member] | Commercial Mortgage Backed Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 0 | 0
Fair Value, Recurring [Member] | Level 3 [Member] | Asset-backed Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 66 | 72
Fair Value, Recurring [Member] | Level 3 [Member] | Collateralized Debt Obligations [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 0 | 0
Fair Value, Recurring [Member] | Level 3 [Member] | Residential Mortgage-Backed Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 0 | 0
Fair Value, Recurring [Member] | Level 3 [Member] | US Government Debt Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 0 | 0
Fair Value, Recurring [Member] | Level 3 [Member] | Debt Security, Government, Non-US [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 0 | 0
Fair Value, Recurring [Member] | Level 3 [Member] | Corporate Debt Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 0 | 0
Fair Value, Recurring [Member] | Level 3 [Member] | Municipal Bonds [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 0 | 0
Collateral Pledged [Member] | Short-term Investments [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) |  | $ 85
Collateral Pledged [Member] | Short-term Investments [Member] | Reported Value Measurement [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 85 |
Collateral Pledged [Member] | Fair Value, Recurring [Member] | Short-term Investments [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 85 |
Collateral Pledged [Member] | Fair Value, Recurring [Member] | Level 1 [Member] | Short-term Investments [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 85 |
Collateral Pledged [Member] | Fair Value, Recurring [Member] | Level 2 [Member] | Short-term Investments [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
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