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Investments (Details 12) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Mortgage Loans On Real Estate Geographic Location Of Property [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%
Pacific [Member]
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]
Mortgage Loans On Real Estate Commercial And Consumer	593,589,000	269,922,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	25.70%	26.90%
South Atlantic [Member]
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]
Mortgage Loans On Real Estate Commercial And Consumer	477,068,000	233,534,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	20.50%	23.30%
Mountain [Member]
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]
Mortgage Loans On Real Estate Commercial And Consumer	233,174,000	116,224,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	10.10%	11.60%
Middle Atlantic [Member]
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]
Mortgage Loans On Real Estate Commercial And Consumer	300,475,000	86,590,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	13.00%	8.60%
West North Central [Member]
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]
Mortgage Loans On Real Estate Commercial And Consumer	168,063,000	69,789,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	7.30%	7.00%
East North Central [Member]
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]
Mortgage Loans On Real Estate Commercial And Consumer	224,122,000	92,861,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	9.70%	9.20%
West South Central [Member]
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]
Mortgage Loans On Real Estate Commercial And Consumer	161,451,000	58,506,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	7.00%	5.80%
East South Central [Member]
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]
Mortgage Loans On Real Estate Commercial And Consumer	62,789,000	40,767,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	2.70%	4.10%
New England [Member]
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]
Mortgage Loans On Real Estate Commercial And Consumer	$ 91,436,000	$ 35,331,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	4.00%	3.50%

X

- 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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X

- 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
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- Details

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