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Business Combinations - Narrative (Details) - USD ($) $ in Millions				1 Months Ended
	Feb. 01, 2025	Jan. 01, 2024	Sep. 01, 2023	Aug. 31, 2024	Dec. 31, 2024
Bright Health Medicare
Business Acquisition [Line Items]
Issued and outstanding capital stock acquisition, percentage		100.00%
Preliminary closing adjustments		$ 441
Acquisition costs					$ 1
Contingent consideration liabilities		100
Contingent consideration		86
Third-party escrow		100
Acquired receivable, fair value		14
Fair value of contingent consideration					$ 100
Purchase price		$ 427
My Choice Wisconsin
Business Acquisition [Line Items]
Purchase price			$ 74
Additional purchase consideration				$ 49
ConnectiCare | Subsequent Event
Business Acquisition [Line Items]
Issued and outstanding capital stock acquisition, percentage	100.00%
Purchase price	$ 350

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Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

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