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Income Taxes (Significant components of the Company's deferred tax assets and liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred Tax Assets: |  |
Property and casualty claim and claim adjustment expense reserves | $ 173 | $ 157
Unearned premium reserves | 193 | 174
Deferred Revenue | 64 | 62
Employee benefits | 46 | 122
Deferred retroactive reinsurance benefit | 90 | 83
Other assets | 88 | 92
Gross deferred tax assets | 654 | 690
Deferred Tax Liabilities: |  |
Investment valuation differences | 93 | 28
Deferred acquisition costs | 99 | 93
Net unrealized gains | 272 | 453
Software and hardware | 27 | 31
Other liabilities | 21 | 19
Gross deferred tax liabilities | 512 | 624
Net deferred tax asset | $ 142 | $ 66

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