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Income Taxes - Deferred tax assets (liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred Tax Assets |  |
Loss reserves and tax discount | $ 214 | $ 150
Unearned premium reserve and other underwriting related reserves | 385 | 355
Investment-related items | 130 | 183
Employee benefits | 287 | 287
Net operating loss carryover | 84 | 521
Other | 27 | 1
Total Deferred Tax Assets | 1,127 | 1,497
Deferred Tax Assets, Valuation Allowance | (4) | 0
Deferred Tax Assets, Net of Valuation Allowance | 1,123 | 1,497
Deferred Tax Liabilities |  |
Deferred acquisition costs | (143) | (104)
Net unrealized gains on investments | (458) | (7)
Other depreciable and amortizable assets | (223) | (135)
Other | 0 | (3)
Total Deferred Tax Liabilities | (824) | (249)
Net Deferred Tax Asset | $ 299 | $ 1,248

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