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Fair Value of Assets and Liabilities (Details 2) (Fixed maturity securities available-for-sale, USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | $ 0 | $ 16,849 | $ 0 | $ 16,849
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount | 0 | 11,152 | 14,012 | 11,156
Corporate securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | 0 | 2,996 | 0 | 2,996
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount | 0 | 0 | 14,012 | 4
US Treasury And Government Member |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | 0 | 0 | 0 | 0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount | 0 | 11,152 | 0 | 11,152
State and political subdivisions |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | 0 | 12,794 | 0 | 12,794
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount | 0 | 0 | 0 | 0
Other foreign government, supranational and foreign government-sponsored enterprises |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | 0 | 1,059 | 0 | 1,059
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount | $ 0 | $ 0 | $ 0 | $ 0

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- Definition Fair Value Assets, Level 1 to level 2 Transfers During Period, Amount + References No definition available. + Details
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Period Type: | duration

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- Definition Fair Value Assets, Level 2 to Level 1 Transfers During Period, Amount + References No definition available. + Details
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Namespace Prefix: | rga_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration