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Investments - Other Segments and Holding Company (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Schedule of Investments
Investments	$ 2,037		$ 2,037		$ 2,310
Other Segments and Holding Company
Schedule of Investments
Investments	106		106		38
Portion of unrealized (losses) gains that related to equity securities still held	0	$ 0	0	$ 0
Equity method investments | Other Segments and Holding Company
Schedule of Investments
Investments	92		92		24
Held to maturity debt investments measured at amortized cost | Other Segments and Holding Company
Schedule of Investments
Investments	11		11		11
Other investments measured at fair value | Other Segments and Holding Company
Schedule of Investments
Investments	$ 3		$ 3		$ 3

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