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Summary of Investments Other Than Investments in Related Parties (Tables) | 12 Months Ended
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Dec. 31, 2015
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, 2015 (in millions)
Type of Investment |  | Cost |  | Fair Value |  | Amount at Which Shown in the Balance Sheets(1)
Fixed maturity securities: |  |  |  |  |  |
Bonds: |  |  |  |  |  |
United States government and government agencies and authorities |  | $ | 1,424 |  |  | $ | 1,382 |  |  | $ | 1,382 |
State and political subdivisions |  | 480 |  |  | 511 |  |  | 511 |
Foreign governments(2) |  | 4,890 |  |  | 6,035 |  |  | 6,035 |
Public utilities |  | 1,955 |  |  | 2,023 |  |  | 2,023 |
Mortgage-backed and asset-backed securities |  | 3,954 |  |  | 4,007 |  |  | 4,007 |
All other corporate bonds |  | 15,620 |  |  | 15,685 |  |  | 15,685 |
Total fixed maturity securities |  | 28,323 |  |  | 29,643 |  |  | 29,643 |
Equity securities: |  |  |  |  |  |
Non-redeemable preferred stock |  | 86 |  |  | 88 |  |  | 88 |
Other equity securities |  | 41 |  |  | 38 |  |  | 38 |
Total equity securities |  | 127 |  |  | 126 |  |  | 126 |
Mortgage loans on real estate |  | 3,130 |  |  |  |  | 3,130 |
Policy loans |  | 1,469 |  |  |  |  | 1,469 |
Funds withheld at interest |  | 5,880 |  |  |  |  | 5,880 |
Short-term investments |  | 558 |  |  |  |  | 558 |
Other invested assets |  | 1,172 |  |  |  |  | 1,172 |
Total investments |  | $ | 40,659 |  |  |  |  | $ | 41,978 |
(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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