CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net Income		$ 160	$ 289	$ 207	$ 253	$ 293	$ (75)	$ 106	$ 197	$ 909	$ 521	$ 1,170
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments										184	(102)	56
Net unrealized investment gains (losses)	[1]									1,829	(9,276)	(1,833)
Effect of updating discount rates on future policy benefits										(499)	7,964	2,207
Change in instrument-specific credit risk for market risk benefits										(10)	20	(43)
Defined benefit pension and postretirement plan adjustments										(2)	23	22
Total other comprehensive income (loss), net of tax										1,502	(1,371)	409
Total comprehensive income (loss)										2,411	(850)	1,579
Comprehensive income attributable to noncontrolling interest										7	4	0
Total comprehensive income (loss) available to Reinsurance Group of America, Inc.										$ 2,404	$ (854)	$ 1,579

[1] Includes cash flow hedges. See Note 12 for additional information on cash flow hedges.