CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Comprehensive income (loss)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 289	$ (75)	$ 749	$ 228	$ 521
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(59)	(150)	83	(134)
Net unrealized investment gains (losses)	(1,780)	(2,239)	(1,163)	(9,567)
OCI, Liability for Future Policy Benefit, Gain (Loss), after Reclassification Adjustment and Tax, Parent	1,906	1,867	1,611	8,198
OCI, Market Risk Benefit, Instrument-Specific Credit Risk, Gain (Loss), after Adjustments and Tax, Parent	(6)	28	(6)	26
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax	4	0	13	(1)
Total other comprehensive income (loss), net of tax			538	(1,478)	$ (1,371)	$ 409
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	354	(569)	1,287	(1,250)
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	2	1	5	2
Total comprehensive income (loss) attributable to RGA, Inc.	$ 352	$ (570)	$ 1,282	$ (1,252)