v3.25.3

Market Risk Benefits (Balances and Changes of Market Risk Benefits) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Dec. 31, 2023
Market Risk Benefit [Line Items]
Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk	$ 219	$ 233
Market Risk Benefit, Net Amount at Risk	238		$ 223
Insurance, Other \| Americas [Member] \| Other Segments
Market Risk Benefit [Line Items]
Market Risk Benefit, after Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change	219	233	206	$ 249
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change	220	241	$ 209	$ 253
Market Risk Benefit, Interest Expense	6	8
Market Risk Benefit, Attributed Fee Collected	18	19
Market Risk Benefit, Benefit Payment	0	0
Market Risk Benefit, Increase (Decrease) from Future Expected Policyholder Behavior Assumption	0	3
Market Risk Benefit, Increase (Decrease) from Interest Rate Change	9	(3)
Market Risk Benefit, Increase (Decrease) from Equity Market Change	(32)	(39)
Market Risk Benefit, Increase (Decrease) from Volatility	1	0
Market Risk Benefit, Increase (Decrease) from Other Assumption	(7)	(13)
Market Risk Benefit, Increase (Decrease) from Actual Policyholder Behavior Different from Expected	16	13
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, before Tax	(1)	(8)
Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk	219	233
Market Risk Benefit, Reinsurance Recoverable, after Allowance	0	0
Market Risk Benefit, Net Amount at Risk	$ 1,218	$ 1,285
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age	72 years	71 years

Amount, before tax, of accumulated other comprehensive income (loss) (AOCI) from (increase) decrease in instrument-specific credit risk on contract or contract feature in long-duration contract issued by insurance entity protecting contract holder from other-than-nominal capital market risk and exposing insurance entity to other-than-nominal capital market risk.

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Amount of cash outflow to policyholder from benefit payment for contract or contract feature in long-duration contract issued by insurance entity that both protects contract holder from other-than-nominal capital market risk and exposes insurance entity to other-than-nominal capital market risk.

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REINSURANCE GROUP OF AMERICA INC 10-Q