CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Comprehensive income (loss)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 253	$ 197	$ 521
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	22	22
Net unrealized investment gains (losses)	1,103	(3,790)
OCI, Liability for Future Policy Benefit, Gain (Loss), after Reclassification Adjustment and Tax, Parent	(721)	3,414
OCI, Market Risk Benefit, Instrument-Specific Credit Risk, Gain (Loss), after Adjustments and Tax, Parent	1	(4)
Total other comprehensive income (loss), net of tax	410	(358)	$ (1,371)	$ 409
Total comprehensive income (loss) attributable to RGA, Inc.	662	(161)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax	5	0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	663	(161)
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	$ 1	$ 0