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Income Taxes - Narrative (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
Net Investment Income [Line Items]
Effective tax rate	11.40%	15.50%	12.60%	8.50%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	21.00%	21.00%
Accumulated other comprehensive income (loss)	$ (1,778)	$ (1,812)	$ (1,778)	$ (1,812)	$ (2,462)
Fixed maturities
Net Investment Income [Line Items]
Accumulated other comprehensive income (loss)	$ (1,600)		$ (1,600)

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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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