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Investments (Details 13) (USD $) | Dec. 31, 2012 | Dec. 31, 2011
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Mortgage Loans on Real Estate [Line Items] |  |
Mortgage Loans On Real Estate Commercial And Consumer | $ 2,312,167,000 | $ 1,003,524,000
Mortgage Loans On Real Estate Due One Year Through Five Years [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage Loans On Real Estate Commercial And Consumer | 1,187,387,000 | 493,027,000
Mortgage Loans On Real Estate Due After Five Years [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage Loans On Real Estate Commercial And Consumer | 776,655,000 | 299,252,000
Mortgage Loans On Real Estate Due After Ten Years [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage Loans On Real Estate Commercial And Consumer | $ 348,125,000 | $ 211,245,000

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- Definition The balance represents the gross amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References No definition available. + Details
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Namespace Prefix: | rga_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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