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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, 2013
Dec. 31, 2012
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis $ 11,416 $ 12,174
Fair value financial liabilities measured on recurring basis 4,536 6,926
Cash And Cash Equivalents [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 928 814
Variable Interest Entity Primary Beneficiary [Member] | Cash And Cash Equivalents [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 78 176
Variable Interest Entity Primary Beneficiary [Member] | Loans Receivable [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 1,790 1,881
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 1,115 1,086
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 41
Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 96 293
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 267 875
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 113 417
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 55 340
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 132 184
Money Market Securities [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 1,068 593
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 321 210
Medium Term Notes [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial liabilities measured on recurring basis 188 165
Perpetual Debt And Equity Securities [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 50 57
Fixed Maturities [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 5,399 5,203
Fixed Maturities [Member] | U S Treasury And Government [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 1,241 884
Fixed Maturities [Member] | State And Municipal Bonds [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 1,457 1,532
Fixed Maturities [Member] | Foreign Government Debt [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 187 196
Fixed Maturities [Member] | Corporate Obligations [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 1,182 1,216
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 910 988
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 81 98
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 39 48
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 153 96
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 149 145
Derivative Assets [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 3 4
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 3 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 1 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
Derivative Liabilities [Member] | Credit Derivatives [Member] | Insured Derivatives [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial liabilities measured on recurring basis 1,655 2,934
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 0 (2)
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 2 141
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 2
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 16 21
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
Other Liabilities [Member] | Warrant [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial liabilities measured on recurring basis 85 6
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 2,590 3,659
Fair Value Inputs Level 1 [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 3,535 2,678
Fair value financial liabilities measured on recurring basis 0 0
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 928 814
Fair Value Inputs Level 1 [Member] | Variable Interest Entity Primary Beneficiary [Member] | Cash And Cash Equivalents [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 78 176
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 1,067 585
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 321 210
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 26 23
Fair Value Inputs Level 1 [Member] | Fixed Maturities [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 1,115 870
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 1,021 784
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 94 86
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]
    
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] | 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 4,578 6,049
Fair value financial liabilities measured on recurring basis 2,070 2,175
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] | Variable Interest Entity Primary Beneficiary [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] | 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 41
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 48 215
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 265 869
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 109 410
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 20 215
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 69 120
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 1 8
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 14 20
Fair Value Inputs Level 2 [Member] | Fixed Maturities [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 3,989 4,062
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 220 100
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 1,394 1,429
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 90 107
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 1,119 1,140
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 907 988
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 80 94
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 20
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 68 65
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 85 119
Fair Value Inputs Level 2 [Member] | Derivative Assets [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 62 89
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 62 89
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 1 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] | Derivative Liabilities [Member] | Credit Derivatives [Member] | Insured Derivatives [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial liabilities measured on recurring basis 7 13
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 209 287
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 2 141
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 1 1
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 85 6
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 1,766 1,727
Fair Value Inputs Level 3 [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 3,362 3,537
Fair value financial liabilities measured on recurring basis 2,676 5,044
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] | Variable Interest Entity Primary Beneficiary [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] | Variable Interest Entity Primary Beneficiary [Member] | Loans Receivable [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 1,790 1,881
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 1,115 1,086
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 48 [1] 78 [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 2 [1] 6 [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 4 [1] 7 [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 35 [1] 125 [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 63 [1] 64 [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 188 [1] 165 [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 10 [1] 14 [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 295 271
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 63 [1] 103 [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 3 [1] 3 [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 63 [1] 76 [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 3 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 1 [1] 4 [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 13 [1] 28 [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 85 [1] 31 [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 64 [1] 26 [1]
Fair Value Inputs Level 3 [Member] | Derivative Assets [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis 0 5
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 [1] 5 [1]
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] | Derivative Liabilities [Member] | Credit Derivatives [Member] | Insured Derivatives [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial liabilities measured on recurring basis 1,648 2,921
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 [1] 4 [1]
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 [1] 1 [1]
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 16 [1] 21 [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 0 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 824 1,932
Counterparty And Cash Collateral Netting [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis (59) (90)
Fair value financial liabilities measured on recurring basis (210) (293)
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] | Variable Interest Entity Primary Beneficiary [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] | 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] | 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]
    
Accounts Notes And Loans Receivable [Line Items]    
Fair value financial assets measured on recurring basis (59) (90)
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 (59) (90)
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] | 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 (209) (293)
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 (1) 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.