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Commitments and Contingencies - Commitments and Contingencies (Details) - USD ($) $ in Millions	12 Months Ended			60 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2016	Dec. 31, 2021	Jan. 01, 2020
Loss Contingencies [Line Items]
Other Commitment	$ 2,400			$ 2,400
Loss Contingency, Undiscounted Amount of Insurance-related Assessment Liability	74	$ 83
Premium tax offsets	0	0		0
Fair value of derivative instrument in a net liability position	52			52
Collateral already posted	50			50
Asbestos and Environmental
Loss Contingencies [Line Items]
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts	604			604
Reinsurance Retention Policy, Excess Retention, Amount Reinsured	485
Reinsurance Retention Policy, Amount Retained			$ 1,700
Adverse development from comprehensive annual review		220		1,015
Other liabilities | Retained Earnings
Loss Contingencies [Line Items]
Off-Balance Sheet, Credit Loss, Liability	$ 25	$ 26		25
Other liabilities | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Retained Earnings
Loss Contingencies [Line Items]
Off-Balance Sheet, Credit Loss, Liability					$ 25
Insurance-related Assessments [Member]
Loss Contingencies [Line Items]
Minimum Percentage of Premiums Written Per Year to be Considered for Assessment Under Guaranty Fund	1.00%
Maximum Percentage of Premiums Written Per Year to be Considered for Assessment Under Guaranty Fund	2.00%
Limited partnerships and other alternative investments
Loss Contingencies [Line Items]
Other Commitment	$ 1,600			1,600
Private Placement Securities
Loss Contingencies [Line Items]
Other Commitment	185			185
Mortgage loans
Loss Contingencies [Line Items]
Other Commitment	679			679
Cancelable mortgage loan [Member]
Loss Contingencies [Line Items]
Other Commitment	$ 382			$ 382

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The liability as of the balance sheet date representing required funding mandated by statute or regulatory authority that is related directly or indirectly to underwriting activities, including pools for self-insurance and excluding premium taxes and income taxes. The funds derived from the assessments generally enable a government guarantor to pay insurance claims in the event that the underwriting insurer is insolvent or otherwise unable to meet its payment obligations.

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Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

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