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Income Taxes - Significant Portions of Deferred Tax Liabilities and Deferred Tax Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |
Deferred Tax Assets, Net of Valuation Allowance | $ 128 | $ 151
Deferred tax assets: |  |
Net operating loss and capital carryforward | 764 | 742
Loss reserves | 218 | 148
Deferred Tax Assets, Debentures | 22 | 29
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation | 9 | 7
Other | 5 | 1
Sub total deferred tax assets | 1,019 | 927
Valuation allowance | 891 | 777
Insurance intangible | 78 | 90
Variable interest entities | 13 | 12
Investments | 22 | 32
Unearned premiums and credit fees | 32 | 42
Other | 7 | 8
Deferred Tax Liabilities, Gross, Noncurrent | 152 | 183
Deferred Tax Liabilities, Net | $ 24 | $ 32

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