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Business Combinations - Intangible Assets Acquired (Details) - Bright Health Medicare $ in Millions	Jan. 01, 2024 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted-average amortization period	11 years 1 month 6 days
Intangible assets	$ 141
Contract rights - member list
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 104
Intangible asset useful life	10 years
Trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 32
Intangible asset useful life	15 years
Provider network
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 5
Intangible asset useful life	10 years

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