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Investments - Balances of Restricted Investments (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]
Restricted investments	$ 212	$ 136
Magellan Complete Care acquisition opening balance
Schedule of Held-to-maturity Securities [Line Items]
Restricted investments	0	49
Cash and cash equivalents
Schedule of Held-to-maturity Securities [Line Items]
Restricted investments	68	63
U.S. Treasury notes
Schedule of Held-to-maturity Securities [Line Items]
Restricted investments	$ 144	$ 24

X

- Definition

This element represents the noncurrent portion of investments which are not defined as or included in marketable (debt, equity, or other) securities that are pledged or subject to withdrawal restrictions.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 954
-SubTopic 210
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=120413173&loc=SL6242262-115580

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 954
-SubTopic 210
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=120413209&loc=SL6242269-115581

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- Definition

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+ References

No definition available.

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