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Investments (Details 11) (USD $) | Dec. 31, 2012 | Dec. 31, 2011
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Mortgage Loans Property Type Indicators [Line Items] |  |
Mortgage Loans On Real Estate Commercial And Consumer | $ 2,312,167,000 | $ 1,003,524,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 100.00% | 100.00%
Apartment [Member] |  |
Mortgage Loans Property Type Indicators [Line Items] |  |
Mortgage Loans On Real Estate Commercial And Consumer | 229,266,000 | 124,674,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 9.90% | 12.40%
Retail [Member] |  |
Mortgage Loans Property Type Indicators [Line Items] |  |
Mortgage Loans On Real Estate Commercial And Consumer | 669,958,000 | 335,745,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 29.00% | 33.50%
Office Building [Member] |  |
Mortgage Loans Property Type Indicators [Line Items] |  |
Mortgage Loans On Real Estate Commercial And Consumer | 825,406,000 | 264,584,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 35.70% | 26.40%
Industrial [Member] |  |
Mortgage Loans Property Type Indicators [Line Items] |  |
Mortgage Loans On Real Estate Commercial And Consumer | 455,682,000 | 200,762,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 19.70% | 20.00%
Other Commercial [Member] |  |
Mortgage Loans Property Type Indicators [Line Items] |  |
Mortgage Loans On Real Estate Commercial And Consumer | $ 131,855,000 | $ 77,759,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 5.70% | 7.70%

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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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- Definition The amount represents the total percentage of each property type in comparison to the total of mortgage loans whose balance represents the 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: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | rga_
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Balance Type: | na
Period Type: | duration