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Segment Information (Details 5) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
US Segment Reporting Information [Member] |  |
Premium Concentration [Line Items] |  |
Gross Premiums From Five Largests Clients | $ 1,511,414,000 | $ 1,401,487,000
Percentage Of Gross Premiums From Five Largests Clients | 33.40% | 33.50%
Canada Segment Reporting Information [Member] |  |
Premium Concentration [Line Items] |  |
Gross Premiums From Five Largests Clients | 513,945,000 | 503,472,000
Percentage Of Gross Premiums From Five Largests Clients | 53.10% | 53.60%
Europe And South Africa Segment Reporting Information [Member] |  |
Premium Concentration [Line Items] |  |
Gross Premiums From Five Largests Clients | 671,511,000 | 634,156,000
Percentage Of Gross Premiums From Five Largests Clients | 50.20% | 51.80%
Asia Pacific Segment Reporting Information [Member] |  |
Premium Concentration [Line Items] |  |
Gross Premiums From Five Largests Clients | 550,975,000 | 603,541,000
Percentage Of Gross Premiums From Five Largests Clients | 39.60% | 45.00%
Corporate And Other Segment Reporting Information [Member] |  |
Premium Concentration [Line Items] |  |
Gross Premiums From Five Largests Clients | $ 1,913,475,000 | $ 1,887,095,000
Percentage Of Gross Premiums From Five Largests Clients | 23.20% | 24.50%

X
- Definition This element represents the amount of gross premiums recognized from the company's top five clients. + References No definition available. + Details
Name: | rga_GrossPremiumsFromFiveLargestsClients
Namespace Prefix: | rga_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This element represents the gross premiums recognized from the company's top five clients as a percentage of a segment's total gross premiums. + References No definition available. + Details
Name: | rga_PercentageOfGrossPremiumsFromFiveLargestsClients
Namespace Prefix: | rga_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | rga_PremiumConcentrationLineItems
Namespace Prefix: | rga_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration