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Business Combinations (Details) - USD ($) $ in Millions			3 Months Ended
	Jan. 01, 2022	Oct. 25, 2021	Mar. 31, 2022
Magellan Complete Care
Business Acquisition, Contingent Consideration [Line Items]
Total purchase price	$ 60
Goodwill	24
Magellan Complete Care | Member list
Business Acquisition, Contingent Consideration [Line Items]
Acquired membership with a preliminary fair value	$ 36,000
Affinity Health Plan, Inc
Business Acquisition, Contingent Consideration [Line Items]
Total purchase price		$ 176
Goodwill			$ 11
Medical claims and benefits payable			25
Amounts due government agencies			$ 4

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Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Amounts due Government Agencies

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