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Summary of Investments Other Than Investments in Related Parties (Tables) | 12 Months Ended
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Dec. 31, 2016
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, 2016 (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 |  | $ | 1,519 |  |  | $ | 1,468 |  |  | $ | 1,468 |
State and political subdivisions |  | 567 |  |  | 592 |  |  | 592 |
Foreign governments(2) |  | 5,157 |  |  | 6,343 |  |  | 6,343 |
Public utilities |  | 1,971 |  |  | 2,091 |  |  | 2,091 |
Mortgage-backed and asset-backed securities |  | 4,044 |  |  | 4,072 |  |  | 4,072 |
All other corporate bonds |  | 16,954 |  |  | 17,528 |  |  | 17,528 |
Total fixed maturity securities |  | 30,212 |  |  | 32,094 |  |  | 32,094 |
Equity securities: |  |  |  |  |  |
Non-redeemable preferred stock |  | 56 |  |  | 51 |  |  | 51 |
Other equity securities |  | 230 |  |  | 224 |  |  | 224 |
Total equity securities |  | 286 |  |  | 275 |  |  | 275 |
Mortgage loans on real estate |  | 3,776 |  |  |  |  | 3,776 |
Policy loans |  | 1,428 |  |  |  |  | 1,428 |
Funds withheld at interest |  | 5,876 |  |  |  |  | 5,876 |
Short-term investments |  | 77 |  |  |  |  | 77 |
Other invested assets |  | 1,315 |  |  |  |  | 1,315 |
Total investments |  | $ | 42,970 |  |  |  |  | $ | 44,841 |
(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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