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Fair Value Of Financial Instruments (Company's Assets And Liabilities Measured At Fair Value On Recurring Basis) (Detail) (USD $) In Millions, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
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Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | $ 10,137 |  | $ 10,786 |
Fair value financial liabilities measured on recurring basis | 2,869 |  | 3,781 |
Variable Interest Entity Primary Beneficiary [Member] | Loans Receivable [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 1,539 |  | 1,612 |
Variable Interest Entity Primary Beneficiary [Member] | Loan Repurchase Commitments [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 363 |  | 359 |
State and municipal bonds [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 86 |  | 89 |
Residential Mortgage Backed Agency [Member] | Mortgage-backed [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Residential Mortgage Backed Non Agency [Member] | Mortgage-backed [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 209 |  | 259 |
Commercial Mortgage Backed Securities [Member] | Mortgage-backed [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 91 |  | 105 |
Collateralized Debt Obligations [Member] | Asset-backed [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 16 |  | 36 |
Other Asset Backed [Member] | Asset-backed [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 72 |  | 98 |
Money Market Securities [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 392 |  | 783 |
Money Market Securities [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 136 |
Medium Term Notes [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 217 |  | 203 |
Perpetual Debt And Equity Securities [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 68 |  | 51 |
Cash And Cash Equivalents [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 534 |  | 1,161 |
Fixed Maturities [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 6,697 |  | 5,996 |
Fixed Maturities [Member] | U S Treasury And Government [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 600 |  | 553 |
Fixed Maturities [Member] | State and municipal bonds [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 1,739 |  | 1,784 |
Fixed Maturities [Member] | Foreign Government Debt [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 313 |  | 189 |
Fixed Maturities [Member] | Corporate Obligations [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 2,407 |  | 1,824 |
Fixed Maturities [Member] | Residential Mortgage Backed Agency [Member] | Mortgage-backed [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 1,192 |  | 1,173 |
Fixed Maturities [Member] | Residential Mortgage Backed Non Agency [Member] | Mortgage-backed [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 59 |  | 92 |
Fixed Maturities [Member] | Commercial Mortgage Backed Securities [Member] | Mortgage-backed [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 31 |  | 39 |
Fixed Maturities [Member] | Collateralized Debt Obligations [Member] | Asset-backed [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 106 |  | 154 |
Fixed Maturities [Member] | Other Asset Backed [Member] | Asset-backed [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 250 |  | 188 |
Derivative Assets [Member] | Credit Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Derivative Assets [Member] | Credit Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Derivative Assets [Member] | Interest Rate Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 4 |  | 4 |
Derivative Assets [Member] | Interest Rate Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Derivative Assets [Member] | Other Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Assets Of Consolidated V I Es [Member] | Cash And Cash Equivalents [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 66 |  | 97 |
Derivative Liabilities [Member] | Credit Derivatives [Member] | Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 335 |  | 1,152 |
Derivative Liabilities [Member] | Credit Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  |  |
Derivative Liabilities [Member] | Credit Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  | 0 |
Derivative Liabilities [Member] | Interest Rate Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 81 |  | 0 |
Derivative Liabilities [Member] | Interest Rate Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  | 0 |
Derivative Liabilities [Member] | Currency Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  | 0 |
Derivative Liabilities [Member] | Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 11 |  | 11 |
Derivative Liabilities [Member] | Other Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 33 |  | 0 |
Other Liabilities [Member] | Warrant [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 42 |  | 59 |
Variable Interest Entity Notes [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 2,150 |  | 2,356 |
Fair Value Inputs Level 1 [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 1,730 |  | 2,713 |
Fair value financial liabilities measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 1 [Member] | Variable Interest Entity Primary Beneficiary [Member] | Loans Receivable [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 1 [Member] | Variable Interest Entity Primary Beneficiary [Member] | Loan Repurchase Commitments [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 1 [Member] | State and municipal bonds [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 1 [Member] | Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 1 [Member] | Residential Mortgage Backed Agency [Member] | Mortgage-backed [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 1 [Member] | Residential Mortgage Backed Non Agency [Member] | Mortgage-backed [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 1 [Member] | Commercial Mortgage Backed Securities [Member] | Mortgage-backed [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 1 [Member] | Collateralized Debt Obligations [Member] | Asset-backed [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 1 [Member] | Other Asset Backed [Member] | Asset-backed [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 1 [Member] | Money Market Securities [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 392 |  | 783 |
Fair Value Inputs Level 1 [Member] | Money Market Securities [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 136 |
Fair Value Inputs Level 1 [Member] | Medium Term Notes [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 1 [Member] | Perpetual Debt And Equity Securities [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 27 |  | 27 |
Fair Value Inputs Level 1 [Member] | Cash And Cash Equivalents [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 534 |  | 1,161 |
Fair Value Inputs Level 1 [Member] | Fixed Maturities [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 711 |  | 509 |
Fair Value Inputs Level 1 [Member] | Fixed Maturities [Member] | U S Treasury And Government [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 486 |  | 397 |
Fair Value Inputs Level 1 [Member] | Fixed Maturities [Member] | State and municipal bonds [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 1 [Member] | Fixed Maturities [Member] | Foreign Government Debt [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 225 |  | 112 |
Fair Value Inputs Level 1 [Member] | Fixed Maturities [Member] | Corporate Obligations [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 1 [Member] | Fixed Maturities [Member] | Residential Mortgage Backed Agency [Member] | Mortgage-backed [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 1 [Member] | Fixed Maturities [Member] | Residential Mortgage Backed Non Agency [Member] | Mortgage-backed [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 1 [Member] | Fixed Maturities [Member] | Commercial Mortgage Backed Securities [Member] | Mortgage-backed [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 1 [Member] | Fixed Maturities [Member] | Collateralized Debt Obligations [Member] | Asset-backed [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 1 [Member] | Fixed Maturities [Member] | Other Asset Backed [Member] | Asset-backed [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 1 [Member] | Derivative Assets [Member] | Credit Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 1 [Member] | Derivative Assets [Member] | Credit Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 1 [Member] | Derivative Assets [Member] | Interest Rate Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 1 [Member] | Derivative Assets [Member] | Interest Rate Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 1 [Member] | Derivative Assets [Member] | Other Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 1 [Member] | Assets Of Consolidated V I Es [Member] | Cash And Cash Equivalents [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 66 |  | 97 |
Fair Value Inputs Level 1 [Member] | Derivative Liabilities [Member] | Credit Derivatives [Member] | Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 1 [Member] | Derivative Liabilities [Member] | Credit Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  |  |
Fair Value Inputs Level 1 [Member] | Derivative Liabilities [Member] | Credit Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 1 [Member] | Derivative Liabilities [Member] | Interest Rate Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 1 [Member] | Derivative Liabilities [Member] | Interest Rate Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 1 [Member] | Derivative Liabilities [Member] | Currency Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 1 [Member] | Derivative Liabilities [Member] | Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 1 [Member] | Derivative Liabilities [Member] | Other Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 1 [Member] | Other Liabilities [Member] | Warrant [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 1 [Member] | Variable Interest Entity Notes [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 2 [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 6,174 |  | 5,763 |
Fair value financial liabilities measured on recurring basis | 1,601 |  | 1,645 |
Fair Value Inputs Level 2 [Member] | Variable Interest Entity Primary Beneficiary [Member] | Loans Receivable [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 2 [Member] | Variable Interest Entity Primary Beneficiary [Member] | Loan Repurchase Commitments [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 2 [Member] | State and municipal bonds [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 2 [Member] | Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 24 |  | 41 |
Fair Value Inputs Level 2 [Member] | Residential Mortgage Backed Agency [Member] | Mortgage-backed [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 2 [Member] | Residential Mortgage Backed Non Agency [Member] | Mortgage-backed [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 205 |  | 255 |
Fair Value Inputs Level 2 [Member] | Commercial Mortgage Backed Securities [Member] | Mortgage-backed [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 91 |  | 102 |
Fair Value Inputs Level 2 [Member] | Collateralized Debt Obligations [Member] | Asset-backed [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 10 |  | 14 |
Fair Value Inputs Level 2 [Member] | Other Asset Backed [Member] | Asset-backed [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 46 |  | 44 |
Fair Value Inputs Level 2 [Member] | Money Market Securities [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 2 [Member] | Money Market Securities [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 2 [Member] | Medium Term Notes [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 2 [Member] | Perpetual Debt And Equity Securities [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 28 |  | 13 |
Fair Value Inputs Level 2 [Member] | Cash And Cash Equivalents [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 2 [Member] | Fixed Maturities [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 5,704 |  | 5,248 |
Fair Value Inputs Level 2 [Member] | Fixed Maturities [Member] | U S Treasury And Government [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 114 |  | 156 |
Fair Value Inputs Level 2 [Member] | Fixed Maturities [Member] | State and municipal bonds [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 1,682 |  | 1,765 |
Fair Value Inputs Level 2 [Member] | Fixed Maturities [Member] | Foreign Government Debt [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 83 |  | 65 |
Fair Value Inputs Level 2 [Member] | Fixed Maturities [Member] | Corporate Obligations [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 2,373 |  | 1,776 |
Fair Value Inputs Level 2 [Member] | Fixed Maturities [Member] | Residential Mortgage Backed Agency [Member] | Mortgage-backed [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 1,184 |  | 1,173 |
Fair Value Inputs Level 2 [Member] | Fixed Maturities [Member] | Residential Mortgage Backed Non Agency [Member] | Mortgage-backed [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 59 |  | 86 |
Fair Value Inputs Level 2 [Member] | Fixed Maturities [Member] | Commercial Mortgage Backed Securities [Member] | Mortgage-backed [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 30 |  | 25 |
Fair Value Inputs Level 2 [Member] | Fixed Maturities [Member] | Collateralized Debt Obligations [Member] | Asset-backed [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 11 |  | 72 |
Fair Value Inputs Level 2 [Member] | Fixed Maturities [Member] | Other Asset Backed [Member] | Asset-backed [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 168 |  | 130 |
Fair Value Inputs Level 2 [Member] | Derivative Assets [Member] | Credit Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 2 [Member] | Derivative Assets [Member] | Credit Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 2 [Member] | Derivative Assets [Member] | Interest Rate Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 66 |  | 46 |
Fair Value Inputs Level 2 [Member] | Derivative Assets [Member] | Interest Rate Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 2 [Member] | Derivative Assets [Member] | Other Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 2 [Member] | Assets Of Consolidated V I Es [Member] | Cash And Cash Equivalents [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 2 [Member] | Derivative Liabilities [Member] | Credit Derivatives [Member] | Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 3 |  | 5 |
Fair Value Inputs Level 2 [Member] | Derivative Liabilities [Member] | Credit Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  |  |
Fair Value Inputs Level 2 [Member] | Derivative Liabilities [Member] | Credit Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 2 [Member] | Derivative Liabilities [Member] | Interest Rate Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 208 |  | 165 |
Fair Value Inputs Level 2 [Member] | Derivative Liabilities [Member] | Interest Rate Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 2 [Member] | Derivative Liabilities [Member] | Currency Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 2 [Member] | Derivative Liabilities [Member] | Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 2 [Member] | Derivative Liabilities [Member] | Other Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 2 [Member] | Other Liabilities [Member] | Warrant [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 42 |  | 59 |
Fair Value Inputs Level 2 [Member] | Variable Interest Entity Notes [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 1,348 |  | 1,416 |
Fair Value Inputs Level 3 [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 2,295 |  | 2,352 |
Fair value financial liabilities measured on recurring basis | 1,395 |  | 2,301 |
Fair Value Inputs Level 3 [Member] | Variable Interest Entity Primary Beneficiary [Member] | Loans Receivable [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 1,539 |  | 1,612 |
Fair Value Inputs Level 3 [Member] | Variable Interest Entity Primary Beneficiary [Member] | Loan Repurchase Commitments [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 363 |  | 359 |
Fair Value Inputs Level 3 [Member] | State and municipal bonds [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 3 [Member] | Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 62 | [1] | 48 | [1]
Fair Value Inputs Level 3 [Member] | Residential Mortgage Backed Agency [Member] | Mortgage-backed [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 3 [Member] | Residential Mortgage Backed Non Agency [Member] | Mortgage-backed [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 4 | [1] | 4 | [1]
Fair Value Inputs Level 3 [Member] | Commercial Mortgage Backed Securities [Member] | Mortgage-backed [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 3 | [1]
Fair Value Inputs Level 3 [Member] | Collateralized Debt Obligations [Member] | Asset-backed [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 6 | [1] | 22 | [1]
Fair Value Inputs Level 3 [Member] | Other Asset Backed [Member] | Asset-backed [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 26 | [1] | 54 | [1]
Fair Value Inputs Level 3 [Member] | Money Market Securities [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 3 [Member] | Money Market Securities [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 3 [Member] | Medium Term Notes [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 217 | [1] | 203 | [1]
Fair Value Inputs Level 3 [Member] | Perpetual Debt And Equity Securities [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 13 | [1] | 11 | [1]
Fair Value Inputs Level 3 [Member] | Cash And Cash Equivalents [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 3 [Member] | Fixed Maturities [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 282 |  | 239 |
Fair Value Inputs Level 3 [Member] | Fixed Maturities [Member] | U S Treasury And Government [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 3 [Member] | Fixed Maturities [Member] | State and municipal bonds [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 57 | [1] | 19 | [1]
Fair Value Inputs Level 3 [Member] | Fixed Maturities [Member] | Foreign Government Debt [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 5 | [1] | 12 | [1]
Fair Value Inputs Level 3 [Member] | Fixed Maturities [Member] | Corporate Obligations [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 34 | [1] | 48 | [1]
Fair Value Inputs Level 3 [Member] | Fixed Maturities [Member] | Residential Mortgage Backed Agency [Member] | Mortgage-backed [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 8 | [1] | 0 |
Fair Value Inputs Level 3 [Member] | Fixed Maturities [Member] | Residential Mortgage Backed Non Agency [Member] | Mortgage-backed [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 6 | [1]
Fair Value Inputs Level 3 [Member] | Fixed Maturities [Member] | Commercial Mortgage Backed Securities [Member] | Mortgage-backed [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 1 | [1] | 14 | [1]
Fair Value Inputs Level 3 [Member] | Fixed Maturities [Member] | Collateralized Debt Obligations [Member] | Asset-backed [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 95 | [1] | 82 | [1]
Fair Value Inputs Level 3 [Member] | Fixed Maturities [Member] | Other Asset Backed [Member] | Asset-backed [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 82 | [1] | 58 | [1]
Fair Value Inputs Level 3 [Member] | Derivative Assets [Member] | Credit Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 3 [Member] | Derivative Assets [Member] | Credit Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 3 [Member] | Derivative Assets [Member] | Interest Rate Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 3 [Member] | Derivative Assets [Member] | Interest Rate Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 3 [Member] | Derivative Assets [Member] | Other Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 3 [Member] | Assets Of Consolidated V I Es [Member] | Cash And Cash Equivalents [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 3 [Member] | Derivative Liabilities [Member] | Credit Derivatives [Member] | Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 332 |  | 1,147 |
Fair Value Inputs Level 3 [Member] | Derivative Liabilities [Member] | Credit Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  |  |
Fair Value Inputs Level 3 [Member] | Derivative Liabilities [Member] | Credit Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 3 [Member] | Derivative Liabilities [Member] | Interest Rate Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 3 [Member] | Derivative Liabilities [Member] | Interest Rate Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 3 [Member] | Derivative Liabilities [Member] | Currency Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 3 [Member] | Derivative Liabilities [Member] | Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 11 | [1] | 11 | [1]
Fair Value Inputs Level 3 [Member] | Derivative Liabilities [Member] | Other Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 33 |  | 0 |
Fair Value Inputs Level 3 [Member] | Other Liabilities [Member] | Warrant [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  | 0 |
Fair Value Inputs Level 3 [Member] | Variable Interest Entity Notes [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 802 |  | 940 |
Counterparty And Cash Collateral Netting [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | (62) |  | (42) |
Fair value financial liabilities measured on recurring basis | (127) |  | (165) |
Counterparty And Cash Collateral Netting [Member] | Variable Interest Entity Primary Beneficiary [Member] | Loans Receivable [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Variable Interest Entity Primary Beneficiary [Member] | Loan Repurchase Commitments [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | State and municipal bonds [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Residential Mortgage Backed Agency [Member] | Mortgage-backed [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Residential Mortgage Backed Non Agency [Member] | Mortgage-backed [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Commercial Mortgage Backed Securities [Member] | Mortgage-backed [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Collateralized Debt Obligations [Member] | Asset-backed [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Other Asset Backed [Member] | Asset-backed [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Money Market Securities [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Money Market Securities [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Medium Term Notes [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Perpetual Debt And Equity Securities [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Cash And Cash Equivalents [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Fixed Maturities [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Fixed Maturities [Member] | U S Treasury And Government [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Fixed Maturities [Member] | State and municipal bonds [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Fixed Maturities [Member] | Foreign Government Debt [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Fixed Maturities [Member] | Corporate Obligations [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Fixed Maturities [Member] | Residential Mortgage Backed Agency [Member] | Mortgage-backed [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Fixed Maturities [Member] | Residential Mortgage Backed Non Agency [Member] | Mortgage-backed [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Fixed Maturities [Member] | Commercial Mortgage Backed Securities [Member] | Mortgage-backed [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Fixed Maturities [Member] | Collateralized Debt Obligations [Member] | Asset-backed [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Fixed Maturities [Member] | Other Asset Backed [Member] | Asset-backed [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Derivative Assets [Member] | Credit Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Derivative Assets [Member] | Credit Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Derivative Assets [Member] | Interest Rate Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | (62) |  | (42) |
Counterparty And Cash Collateral Netting [Member] | Derivative Assets [Member] | Interest Rate Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Derivative Assets [Member] | Other Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Assets Of Consolidated V I Es [Member] | Cash And Cash Equivalents [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial assets measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Derivative Liabilities [Member] | Credit Derivatives [Member] | Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Derivative Liabilities [Member] | Credit Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  |  |
Counterparty And Cash Collateral Netting [Member] | Derivative Liabilities [Member] | Credit Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Derivative Liabilities [Member] | Interest Rate Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | (127) |  | (165) |
Counterparty And Cash Collateral Netting [Member] | Derivative Liabilities [Member] | Interest Rate Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Derivative Liabilities [Member] | Currency Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Derivative Liabilities [Member] | Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Derivative Liabilities [Member] | Other Derivatives [Member] | Non Insured Derivatives [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Other Liabilities [Member] | Warrant [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | 0 |  | 0 |
Counterparty And Cash Collateral Netting [Member] | Variable Interest Entity Notes [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Fair value financial liabilities measured on recurring basis | $ 0 |  | $ 0 |
[1] | Unobservable inputs are either not developed by the Company or do not significantly impact the overall fair values of the aggregate financial assets and liabilities.

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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X
- Definition Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity. + References No definition available. + Details
Name: | us-gaap_LiabilitiesFairValueDisclosureRecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant