10-Q Basis of Presentation and Significant Accounting (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Line Items]
Customer funds and cash and cash equivalents on deposit for regulatory requirements	$ 300	$ 258	$ 173
Securities lending transactions, initial collateral percentage value	102.00%
Premium receivable, allowance for doubtful accounts	$ 188	152	142
Self-funded receivables, allowance for doubtful accounts	93	68	50
Allowance for doubtful accounts, other receivables	$ 875	744	648
Long-term Debt		$ 23,849	$ 22,756

Accounting Policies [Line Items]

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- Definition

Initial minimum percentage of cash and/or securities collateral accepted as compared to the value of securities on loan in a securities lending transaction.

+ References

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The carrying value as of the balance sheet date of the estimated valuation allowance to reduce gross self-funded receivable to net realizable value.

+ References

No definition available.

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Amount of allowance for credit loss on receivable, classified as other and current.

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- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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- Definition

The carrying value as of the balance sheet date of the estimated valuation allowance to reduce gross premiums receivable to net realizable value.

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The current cash, cash equivalents and investments that are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. Includes current cash equivalents and investments that are similarly restricted as to withdrawal, usage or disposal.

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