CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues
Net premiums									$ 17,843.0	$ 15,085.0	$ 13,078.0
Net investment income									4,416.0	3,591.0	3,161.0
Investment related gains (losses), net									(745.0)	(481.0)	(539.0)
Other revenues									593.0	372.0	527.0
Total revenues	$ 5,241.0	$ 5,651.0	$ 4,878.0	$ 6,337.0	$ 5,007.0	$ 5,153.0	$ 4,156.0	$ 4,251.0	22,107.0	18,567.0	16,227.0
Benefits and expenses
Claims and other policy benefits									16,903.0	13,872.0	11,982.0
Liability for Future Policy Benefit, Remeasurement Gain (Loss)									(32.0)	(62.0)	291.0
Market Risk Benefit, Change in Fair Value, Gain (Loss)									(44.0)	(10.0)	10.0
Interest credited									1,087.0	864.0	682.0
Other operating expenses									1,268.0	1,089.0	1,009.0
Interest expense									304.0	257.0	191.0
Total benefits and expenses	5,016.0	5,437.0	4,609.0	6,065.0	4,843.0	4,773.0	3,891.0	3,900.0	21,127.0	17,407.0	15,509.0
Income before income taxes	225.0	214.0	269.0	272.0	164.0	380.0	265.0	351.0	980.0	1,160.0	718.0
Provision for income taxes									256.0	251.0	197.0
Net income	$ 150.0	$ 158.0	$ 204.0	$ 212.0	$ 160.0	$ 289.0	$ 207.0	$ 253.0	724.0	909.0	521.0
Net income attributable to noncontrolling interest									7.0	7.0	4.0
Net income available to RGA, Inc. shareholders									$ 717.0	$ 902.0	$ 517.0
Earnings per share
Basic earnings per share	$ 2.26	$ 2.37	$ 3.07	$ 3.20	$ 2.40	$ 4.34	$ 3.09	$ 3.77	$ 10.90	$ 13.60	$ 7.73
Diluted earnings per share	$ 2.22	$ 2.33	$ 3.03	$ 3.16	$ 2.37	$ 4.29	$ 3.05	$ 3.72	$ 10.73	$ 13.44	$ 7.64
Deferred Policy Acquisition Costs, Amortization Expense									$ 1,641.0	$ 1,397.0	$ 1,344.0