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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Net Investment Income [Line Items]
Effective tax rate	12.70%	(0.30%)
Income tax expense (benefit)	$ 22	$ (1)
Unrealized gains (losses) on investments	344	(125)
Accumulated other comprehensive income (loss)	(2,181)	(2,469)	$ (2,462)
Accumulated other comprehensive income (loss)	(2,181)	$ (2,469)	$ (2,462)
Fixed maturities
Net Investment Income [Line Items]
Accumulated other comprehensive income (loss)	(2,100)
Accumulated other comprehensive income (loss)	$ (2,100)

X

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Amount, after tax, of accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source.

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