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Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Tax provision at U.S. federal statutory rate	$ 200	$ 171	$ 583	$ 449
Nontaxable investment income	(9)	(12)	(31)	(32)
Other	6	(3)	35	12
Income tax expense	$ 185	$ 162	$ 517	$ 405

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