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Investments - Investment Gains (Losses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Investment Gains (Losses) [Abstract]
Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock included within equity securities held	$ (10)	$ (38)	$ (42)	$ (59)
Nonredeemable Preferred Stock
Investment Gains (Losses) [Abstract]
Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock included within equity securities held	13	2	24	2
Fixed maturity securities
Investment Gains (Losses) [Abstract]
Gross gains	11	12	38	55
Gross losses	(33)	(49)	(104)	(141)
Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock included within equity securities held	(22)	(37)	(66)	(86)
Equity securities
Investment Gains (Losses) [Abstract]
Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock included within equity securities held	13	2	25	(9)
Short-term investments and other
Investment Gains (Losses) [Abstract]
Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock included within equity securities held	$ (1)	$ (3)	$ (1)	(10)
Gain on acquisition of a joint venture
Investment Gains (Losses) [Abstract]
Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock included within equity securities held				$ 46

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- Definition

Investment Gains, Gross

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Investment Loss, Gross

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Amount of realized and unrealized gain (loss) on investment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(9)(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(7)(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

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