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Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Maturity period (less than)		15 years
Average maturity period (less than)		15 years
Interest receivable	$ 35	$ 35	$ 11
Contingent consideration liabilities	8	8	47
Contingent consideration liabilities settled		20	20	$ 0
ROU assets impairments	192
Marketplace risk adjustment payables	230	230	902
Risk adjustment receivable	135	135	7
Risk adjustment, net payable	95	95	895
Prepaid reinsurance premiums	2	2	2	9
Reinsurance recoveries		35	33	23
Reinsurance recoverable	27	$ 27	51	$ 30
New York
Property, Plant and Equipment [Line Items]
Premium revenue percentage		10.00%
Texas
Property, Plant and Equipment [Line Items]
Premium revenue percentage		12.00%
Washington
Property, Plant and Equipment [Line Items]
Premium revenue percentage		13.60%
Leasehold improvements
Property, Plant and Equipment [Line Items]
Impairment on property and equipment		$ 16
Level 3
Property, Plant and Equipment [Line Items]
Contingent consideration liabilities	$ 8	8	47
COVID-19
Property, Plant and Equipment [Line Items]
Reduction in premiums		$ 197	$ 323
Minimum
Property, Plant and Equipment [Line Items]
Useful life		5 years
Minimum | Premium revenue
Property, Plant and Equipment [Line Items]
Percentage of additional incremental revenue earned		1.00%
Maximum
Property, Plant and Equipment [Line Items]
Useful life		16 years
Maximum | Premium revenue
Property, Plant and Equipment [Line Items]
Percentage of additional incremental revenue earned		4.00%

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