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Summary of Investments Other Than Investments in Related Parties (Tables) | 12 Months Ended
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Dec. 31, 2023
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Abstract] |
Summary Of Investments Other Than Investments In Related Parties [Table Text Block] | REINSURANCE GROUP OF AMERICA, INCORPORATED SCHEDULE I-SUMMARY OF INVESTMENTS-OTHER THAN INVESTMENTS IN RELATED PARTIES December 31, 2023 (in millions)
Type of Investment |  | Amortized Cost |  | Estimated Fair Value |  | Amount at Which Shown in the Balance Sheets (1)
Fixed maturity securities: |  |  |  |  |  |
United States government and government agencies and authorities |  | $ | 2,725 |  |  | $ | 2,520 |  |  | $ | 2,520 |
State and political subdivisions |  | 1,236 |  |  | 1,114 |  |  | 1,114 |
Foreign governments (2) |  | 11,199 |  |  | 10,797 |  |  | 10,797 |
Public utilities |  | 5,549 |  |  | 5,031 |  |  | 5,031 |
Mortgage-backed and asset-backed securities |  | 7,803 |  |  | 7,281 |  |  | 7,281 |
All other corporate bonds |  | 36,465 |  |  | 33,724 |  |  | 33,724 |
Total fixed maturity securities |  | $ | 64,977 |  |  | $ | 60,467 |  |  | $ | 60,467 |
Equity securities |  | $ | 174 |  |  | $ | 139 |  |  | $ | 139 |
Mortgage loans |  | 7,377 |  |  |  |  | 7,377 |
Policy loans |  | 1,206 |  |  |  |  | 1,206 |
Funds withheld at interest |  | 5,683 |  |  |  |  | 5,683 |
Limited partnerships and real estate joint ventures |  | 2,635 |  |  |  |  | 2,635 |
Short-term investments |  | 222 |  |  |  |  | 222 |
Other invested assets |  | 1,171 |  |  |  |  | 1,171 |
Total investments |  | $ | 83,445 |  |  |  |  | $ | 78,900 |
(1)Fixed maturity securities are classified as available-for-sale and carried at fair value. (2)Includes fixed maturities directly issued by foreign governments, supranational and foreign government-sponsored enterprises.

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