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Income Taxes - Deferred tax assets (liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Deferred Tax Assets |  |  |
Loss reserves and tax discount | $ 386 | $ 312 |
Unearned premium reserve and other underwriting related reserves | 406 | 384 |
Investment-related items | 8 | 125 |
Employee benefits | 225 | 282 |
Net operating loss carryover | 29 | 11 |
Other | 0 | 34 |
Total Deferred Tax Assets | 1,054 | 1,148 |
Deferred Tax Assets, Valuation Allowance | (7) | (4) |
Deferred Tax Assets, Net of Valuation Allowance | 1,047 | 1,144 |
Deferred Tax Liabilities |  |  |
Deferred acquisition costs | (129) | (120) |
Net unrealized gains on investments | (428) | (758) |
Other depreciable and amortizable assets | (216) | (220) |
Deferred Tax Liabilities, Other | 4 | 0 |
Total Deferred Tax Liabilities | (777) | (1,098) |
Net Deferred Tax Asset | $ 270 | $ 46 | $ 299

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