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Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Maturity period (less than)	15 years
Interest receivable	$ 56	$ 53
Receivables	3,299	3,104
Minimum MLR, medical cost corridors and profit sharing liability	$ 1,006	$ 1,344
Percent due to medicare, medical loss ratio	85.00%	85.00%
Government agencies liability	$ 32	$ 64
Percent due to medicare, medical loss ratio of marketplace	80.00%	80.00%
Medical loss ratio of marketplace	$ 30	$ 2
Risk adjustments liability	115	66
Risk adjustment payable	290	201
Risk adjustment receivable	192	241
Risk adjustment, net receivable		40
Risk adjustment, credit loss allowances	41
Risk adjustment, net payable	98
Prepaid reinsurance premiums	8	11	$ 2
Reinsurance recoveries	20	21	$ 35
Reinsurance recoverable	21	28
Government Receivables
Property, Plant and Equipment [Line Items]
Receivables	$ 2,223	$ 2,354
CALIFORNIA
Property, Plant and Equipment [Line Items]
Premium revenue percentage	10.70%
WASHINGTON
Property, Plant and Equipment [Line Items]
Premium revenue percentage	10.40%
TEXAS
Property, Plant and Equipment [Line Items]
Premium revenue percentage	10.70%
Minimum
Property, Plant and Equipment [Line Items]
Useful life	5 years
Minimum | Premium revenue
Property, Plant and Equipment [Line Items]
Revenue ranging	1.00%
Maximum
Property, Plant and Equipment [Line Items]
Useful life	16 years
Maximum | Premium revenue
Property, Plant and Equipment [Line Items]
Revenue ranging	4.00%
Structured Securities
Property, Plant and Equipment [Line Items]
Average maturity period (less than)	15 years

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