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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
Sep. 30, 2014
Dec. 31, 2013
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis $ 10,382 $ 10,786
Fair value financial liabilities measured on recurring basis 3,124 3,781
Variable Interest Entity Primary Beneficiary [Member] | Residential Loans Receivable [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 1,495 1,612
Variable Interest Entity Primary Beneficiary [Member] | Corporate Loans Receivable [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 407  
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 365 359
Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 90 89
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 207 259
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 85 105
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 15 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 74 98
Money Market Securities [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 610 783
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   136
Medium Term Notes [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial liabilities measured on recurring basis 202 203
Perpetual Debt And Equity Securities [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 80 51
Cash And Cash Equivalents [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 550 1,161
Fixed Maturities [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 6,344 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 630 553
Fixed Maturities [Member] | State and municipal bonds [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 1,722 1,784
Fixed Maturities [Member] | Foreign Government Debt [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 279 189
Fixed Maturities [Member] | Corporate Obligations [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 2,144 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 1,156 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 55 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 27 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 100 154
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 231 188
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
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 56 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 288 1,152
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 102 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 7 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 38  
Other Liabilities [Member] | Warrant [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial liabilities measured on recurring basis 24 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 2,463 2,356
Fair Value Inputs Level 1 [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 1,953 2,713
Fair value financial liabilities measured on recurring basis 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 610 783
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   136
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 550 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 710 509
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 515 397
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
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 195 112
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 56 97
Fair Value Inputs Level 2 [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 6,214 5,763
Fair value financial liabilities measured on recurring basis 1,956 1,645
Fair Value Inputs Level 2 [Member] | Variable Interest Entity Primary Beneficiary [Member] | Corporate Loans Receivable [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 407  
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 21 41
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 203 255
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 85 102
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 9 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 35 44
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 40 13
Fair Value Inputs Level 2 [Member] | Fixed Maturities [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 5,345 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 115 156
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 1,664 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 78 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 2,106 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 1,156 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 55 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 26 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 8 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 137 130
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 69 46
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 4 5
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 211 165
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 24 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 1,717 1,416
Fair Value Inputs Level 3 [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 2,280 2,352
Fair value financial liabilities measured on recurring basis 1,277 2,301
Fair Value Inputs Level 3 [Member] | Variable Interest Entity Primary Beneficiary [Member] | Residential Loans Receivable [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 1,495 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 365 359
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 69 [1] 48 [1]
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   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 39 [1] 54 [1]
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 202 [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] | Fixed Maturities [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 289 239
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
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 58 [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 6 [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 38 [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 0 [1]  
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   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 92 [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 94 [1] 58 [1]
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 284 1,147
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 7 [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 38  
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 746 940
Counterparty And Cash Collateral Netting [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis (65) (42)
Fair value financial liabilities measured on recurring basis (109) (165)
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 (65) (42)
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 $ (109) $ (165)
[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.