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Claim and Claim Adjustment Expense Reserves, Reinsurance of Excess Workers' Compensation Policies (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended		13 Months Ended
	Feb. 05, 2021	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2021	Sep. 30, 2020	Feb. 05, 2021	Dec. 31, 2019
Reinsurance of Excess Workers' Compensation Policies [Abstract]
Claims paid				$ 3,503	$ 3,841
Cavello [Member]
Reinsurance of Excess Workers' Compensation Policies [Abstract]
Percentage of outstanding reserves maintained as security in collateral trust account		105.00%
CNA Financial [Member] | Loss Portfolio Transfer for Workers' Compensation Liabilities [Member]
Reinsurance of Excess Workers' Compensation Policies [Abstract]
Reinsurance recoverable		$ 690		$ 690			$ 690
Reinsurance premium paid	$ 697
Claims paid						$ 64
Loss contingency, after tax and noncontrolling interests			$ 11
CNA Financial [Member] | Loss Portfolio Transfer for Workers' Compensation Liabilities [Member] | Maximum [Member]
Reinsurance of Excess Workers' Compensation Policies [Abstract]
Reinsurance recoverable	$ 1,000					$ 1,000

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Amount, after effects of reinsurance, of payments to settle insured claims and pay costs incurred in the claims settlement process.

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Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

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