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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
Dec. 31, 2017
Dec. 31, 2016
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis $ 7,102 $ 7,564
Fair value financial liabilities measured on recurring basis 1,459 1,784
Money Market Securities [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 180 521
Medium Term Notes [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial liabilities measured on recurring basis 115 101
Perpetual Debt And Equity Securities [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 63 35
Cash And Cash Equivalents [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 122 163
Fixed Income Funds [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis [1] 82 75
Other [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 14  
Other Payable [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial liabilities measured on recurring basis 7  
Fixed Maturities [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 4,328 4,999
Fixed Maturities [Member] | U S Treasury And Government [Member] | Other Fixed Maturity Investments [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 1,352 937
Fixed Maturities [Member] | State and municipal bonds [Member] | Other Fixed Maturity Investments [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 858 1,440
Fixed Maturities [Member] | Foreign Government Debt [Member] | Other Fixed Maturity Investments [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 10 9
Fixed Maturities [Member] | Corporate Obligations [Member] | Other Fixed Maturity Investments [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 1,340 1,334
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 368 868
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 32 45
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 67 43
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 118 22
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 183 301
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 2 3
Derivative Assets [Member] | Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 19 19
Assets Of Consolidated V I Es [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 407 404
Assets Of Consolidated V I Es [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 19 27
Assets Of Consolidated V I Es [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 108 149
Assets Of Consolidated V I Es [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 36 52
Assets Of Consolidated V I Es [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 8
Assets Of Consolidated V I Es [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 10 19
Assets Of Consolidated V I Es [Member] | Loans Receivable At Fair Value [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 759 916
Assets Of Consolidated V I Es [Member] | Loans Receivable At Fair Value [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 920 150
Assets Of Consolidated V I Es [Member] | Cash And Cash Equivalents [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 24 24
Derivative Liabilities [Member] | Credit Derivatives [Member] | Insured Derivatives [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial liabilities measured on recurring basis 65 66
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 193 213
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 4 20
Other Liabilities [Member] | Warrant [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial liabilities measured on recurring basis 6 33
Liabilities Of Consolidated Vies [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 1,069 1,351
Fair Value Inputs Level 1 [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 1,608 1,559
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 180 521
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 26 26
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 122 163
Fair Value Inputs Level 1 [Member] | Fixed Maturities [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 1,256 825
Fair Value Inputs Level 1 [Member] | Fixed Maturities [Member] | U S Treasury And Government [Member] | Other Fixed Maturity Investments [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 1,256 825
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
Fair Value Inputs Level 1 [Member] | Assets Of Consolidated V I Es [Member] | Cash And Cash Equivalents [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 24 24
Fair Value Inputs Level 2 [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 3,272 4,378
Fair value financial liabilities measured on recurring basis 864 1,123
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 37 9
Fair Value Inputs Level 2 [Member] | Fixed Maturities [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 3,058 4,113
Fair Value Inputs Level 2 [Member] | Fixed Maturities [Member] | U S Treasury And Government [Member] | Other Fixed Maturity Investments [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 96 112
Fair Value Inputs Level 2 [Member] | Fixed Maturities [Member] | State and municipal bonds [Member] | Other Fixed Maturity Investments [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 858 1,440
Fair Value Inputs Level 2 [Member] | Fixed Maturities [Member] | Foreign Government Debt [Member] | Other Fixed Maturity Investments [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 10 9
Fair Value Inputs Level 2 [Member] | Fixed Maturities [Member] | Corporate Obligations [Member] | Other Fixed Maturity Investments [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 1,338 1,332
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 368 868
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 32 45
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 60 43
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 118 7
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 178 257
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 2 3
Fair Value Inputs Level 2 [Member] | Assets Of Consolidated V I Es [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 19 27
Fair Value Inputs Level 2 [Member] | Assets Of Consolidated V I Es [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 108 149
Fair Value Inputs Level 2 [Member] | Assets Of Consolidated V I Es [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 30 52
Fair Value Inputs Level 2 [Member] | Assets Of Consolidated V I Es [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 8 7
Fair Value Inputs Level 2 [Member] | Assets Of Consolidated V I Es [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 10 18
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 2 2
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 193 213
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 6 33
Fair Value Inputs Level 2 [Member] | Liabilities Of Consolidated Vies [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 663 875
Fair Value Inputs Level 3 [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 2,140 1,552
Fair value financial liabilities measured on recurring basis 595 661
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 [2] 115 101
Fair Value Inputs Level 3 [Member] | Perpetual Debt And Equity Securities [Member] | Asset-backed [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis   0
Fair Value Inputs Level 3 [Member] | Other [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis [2] 14  
Fair Value Inputs Level 3 [Member] | Other Payable [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial liabilities measured on recurring basis [2] 7  
Fair Value Inputs Level 3 [Member] | Fixed Maturities [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 14 61
Fair Value Inputs Level 3 [Member] | Fixed Maturities [Member] | Corporate Obligations [Member] | Other Fixed Maturity Investments [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis [2] 2 2
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 [2] 7  
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 [2]   15
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 [2] 5 44
Fair Value Inputs Level 3 [Member] | Derivative Assets [Member] | Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis [2] 19 19
Fair Value Inputs Level 3 [Member] | Assets Of Consolidated V I Es [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 407 404
Fair Value Inputs Level 3 [Member] | Assets Of Consolidated V I Es [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 [2] 6  
Fair Value Inputs Level 3 [Member] | Assets Of Consolidated V I Es [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 [2] 1 1
Fair Value Inputs Level 3 [Member] | Assets Of Consolidated V I Es [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 [2]   1
Fair Value Inputs Level 3 [Member] | Assets Of Consolidated V I Es [Member] | Loans Receivable At Fair Value [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 759 916
Fair Value Inputs Level 3 [Member] | Assets Of Consolidated V I Es [Member] | Loans Receivable At Fair Value [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 [2] 920 150
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 63 64
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 4 20
Fair Value Inputs Level 3 [Member] | Liabilities Of Consolidated Vies [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 $ 406 $ 476
[1]
Investment that was measured at fair value by applying the net asset value per share practical expedient, and was required not to be classified in the fair value hierarchy.
[2]
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.