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Investments (Narrative) (Details) $ in Billions	3 Months Ended
	Mar. 31, 2024 USD ($) security	Mar. 31, 2023 USD ($)	Dec. 31, 2023 security
Investments [Abstract]
Percentage of fixed maturity portfolio rated investment grade based on NAIC designations	97.00%		98.00%
Number of securities in unrealized loss position | security	3,525		3,639
Percentage of unrealized losses on fixed maturity securities where securities are rated investment grade	98.00%		98.00%
Proceeds from sales of available for sale fixed maturity securities	$ 4.9	$ 2.3
Principal repayments, calls and tenders for available for sale fixed maturity securities	$ 0.6	$ 0.9

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- Definition

Represents the percent of available-for-sale debt securities at fair value, rated investment grade (NAIC 1 or 2).

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Represents the percent of unrealized losses on fixed maturity securities that is on securities classified as investment grade.

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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of cash inflow from maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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