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Income Taxes - Deferred tax assets (liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred Tax Assets |  |
Loss reserves and tax discount | $ 312 | $ 214
Unearned premium reserve and other underwriting related reserves | 384 | 385
Investment-related items | 125 | 130
Employee benefits | 282 | 287
Net operating loss carryover | 11 | 84
Other | 34 | 27
Total Deferred Tax Assets | 1,148 | 1,127
Deferred Tax Assets, Valuation Allowance | (4) | (4)
Deferred Tax Assets, Net of Valuation Allowance | 1,144 | 1,123
Deferred Tax Liabilities |  |
Deferred acquisition costs | (120) | (143)
Net unrealized gains on investments | (758) | (458)
Other depreciable and amortizable assets | (220) | (223)
Total Deferred Tax Liabilities | (1,098) | (824)
Net Deferred Tax Asset | $ 46 | $ 299

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