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Investments - Balances of Restricted Investments (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Restricted investments	$ 136	$ 79
Magellan Complete Care
Schedule of Held-to-maturity Securities [Line Items]
Restricted investments	49	0
Florida
Schedule of Held-to-maturity Securities [Line Items]
Restricted investments	12	12
New Mexico
Schedule of Held-to-maturity Securities [Line Items]
Restricted investments	21	21
New York
Schedule of Held-to-maturity Securities [Line Items]
Restricted investments	14	9
Ohio
Schedule of Held-to-maturity Securities [Line Items]
Restricted investments	16	12
Other
Schedule of Held-to-maturity Securities [Line Items]
Restricted investments	$ 24	$ 25