Schedule II-Condensed Financial Information Of Registrant (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2023
Due to subsidiaries	$ 9,683	$ 7,849		$ 10,366
Due from subsidiaries	4,298	3,749		$ 5,293
Anthem, Inc. [Member]
Cash dividends received from subsidiaries	3,097	3,134	$ 3,618
Cash dividends paid to subsidiaries	61	54	46
Capital contribution to subsidiaries	411	3,271	$ 2,460
Parental Guarantees	550
Anthem, Inc. [Member] \| Subsidiaries [Member]
Due to subsidiaries	789	0
Due from subsidiaries	$ 0	446
Anthem, Inc. [Member] \| Subsidiaries [Member] \| Notes Receivable [Member]
Due from subsidiaries		$ 1,500

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This element represents disclosure of the total aggregate cash dividends paid to the entity by consolidated subsidiaries, by unconsolidated subsidiaries, and by 50 percent or less owned persons accounted for using the equity method.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

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Amount of liabilities classified as other, due within one year or the normal operating cycle, if longer.

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Amount due from parties in nontrade transactions, classified as other.

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