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Fair Value Disclosures (Details 1) (USD $)	Sep. 30, 2012
Discounted Cash Flow [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Reinsurance ceded receivable - embedded derivatives	$ 4,192,000
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities	751,112,000
Interest-sensitive contract liabilities - embedded derivatives - variable annuities	202,692,000
Discounted Cash Flow [Member] | Mortality [Member] | Minimum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Reinsurance ceded receivable - embedded derivatives Unobservable Input Range	0.00%
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	0.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	0.00%
Discounted Cash Flow [Member] | Mortality [Member] | Maximum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Reinsurance ceded receivable - embedded derivatives Unobservable Input Range	100.00%
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	100.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	100.00%
Discounted Cash Flow [Member] | Mortality [Member] | Weighted Average [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Reinsurance ceded receivable - embedded derivatives Unobservable Input Range	8.00%
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	1.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	1.00%
Discounted Cash Flow [Member] | Lapse [Member] | Minimum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Reinsurance ceded receivable - embedded derivatives Unobservable Input Range	14.00%
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	0.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	0.00%
Discounted Cash Flow [Member] | Lapse [Member] | Maximum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Reinsurance ceded receivable - embedded derivatives Unobservable Input Range	16.00%
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	35.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	25.00%
Discounted Cash Flow [Member] | Lapse [Member] | Weighted Average [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Reinsurance ceded receivable - embedded derivatives Unobservable Input Range	15.00%
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	4.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	5.00%
Discounted Cash Flow [Member] | Withdrawal [Member] | Minimum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	0.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	0.00%
Discounted Cash Flow [Member] | Withdrawal [Member] | Maximum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	5.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	7.00%
Discounted Cash Flow [Member] | Withdrawal [Member] | Weighted Average [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	4.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	4.00%
Discounted Cash Flow [Member] | Own Credit [Member] | Minimum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	0.00%
Discounted Cash Flow [Member] | Own Credit [Member] | Maximum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	1.00%
Discounted Cash Flow [Member] | Own Credit [Member] | Weighted Average [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	1.00%
Discounted Cash Flow [Member] | Option Budget Projection [Member] | Minimum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	2.00%
Discounted Cash Flow [Member] | Option Budget Projection [Member] | Maximum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	4.00%
Discounted Cash Flow [Member] | Option Budget Projection [Member] | Weighted Average [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	3.00%
Discounted Cash Flow [Member] | Long Term Volatility [Member] | Minimum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	0.00%
Discounted Cash Flow [Member] | Long Term Volatility [Member] | Maximum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	27.00%
Discounted Cash Flow [Member] | Long Term Volatility [Member] | Weighted Average [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	16.00%
Total Return Swap [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Funds withheld at interest - embedded derivatives	(320,501,000)
Total Return Swap [Member] | Mortality [Member] | Minimum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Funds withheld at interest - embedded derivatives Unobservable Input Range	0.00%
Total Return Swap [Member] | Mortality [Member] | Maximum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Funds withheld at interest - embedded derivatives Unobservable Input Range	100.00%
Total Return Swap [Member] | Mortality [Member] | Weighted Average [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Funds withheld at interest - embedded derivatives Unobservable Input Range	1.00%
Total Return Swap [Member] | Lapse [Member] | Minimum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Funds withheld at interest - embedded derivatives Unobservable Input Range	0.00%
Total Return Swap [Member] | Lapse [Member] | Maximum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Funds withheld at interest - embedded derivatives Unobservable Input Range	35.00%
Total Return Swap [Member] | Lapse [Member] | Weighted Average [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Funds withheld at interest - embedded derivatives Unobservable Input Range	4.00%
Total Return Swap [Member] | Withdrawal [Member] | Minimum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Funds withheld at interest - embedded derivatives Unobservable Input Range	0.00%
Total Return Swap [Member] | Withdrawal [Member] | Maximum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Funds withheld at interest - embedded derivatives Unobservable Input Range	5.00%
Total Return Swap [Member] | Withdrawal [Member] | Weighted Average [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Funds withheld at interest - embedded derivatives Unobservable Input Range	4.00%
Total Return Swap [Member] | Own Credit [Member] | Minimum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Funds withheld at interest - embedded derivatives Unobservable Input Range	0.00%
Total Return Swap [Member] | Own Credit [Member] | Maximum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Funds withheld at interest - embedded derivatives Unobservable Input Range	1.00%
Total Return Swap [Member] | Own Credit [Member] | Weighted Average [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Funds withheld at interest - embedded derivatives Unobservable Input Range	1.00%
Total Return Swap [Member] | Crediting Rate [Member] | Minimum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Funds withheld at interest - embedded derivatives Unobservable Input Range	2.00%
Total Return Swap [Member] | Crediting Rate [Member] | Maximum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Funds withheld at interest - embedded derivatives Unobservable Input Range	4.00%
Total Return Swap [Member] | Crediting Rate [Member] | Weighted Average [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Funds withheld at interest - embedded derivatives Unobservable Input Range	3.00%
Market Comparable Securities [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
State And Political Subdivision Securities	15,186,000
Corporate Securities	431,187,000
Market Comparable Securities [Member] | Liquidity Premium [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Short-term Investments	$ 22,061,000
Market Comparable Securities [Member] | Liquidity Premium [Member] | Minimum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
State And Political Subdivision Securities Unobservable Input Range	1.00%
Corporate Securities Unobservable Input Range	0.00%
Short Term Investments Unobservable Input Range	1.00%
Market Comparable Securities [Member] | Liquidity Premium [Member] | Maximum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
State And Political Subdivision Securities Unobservable Input Range	1.00%
Corporate Securities Unobservable Input Range	2.00%
Short Term Investments Unobservable Input Range	1.00%
Market Comparable Securities [Member] | Liquidity Premium [Member] | Weighted Average [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
State And Political Subdivision Securities Unobservable Input Range	1.00%
Corporate Securities Unobservable Input Range	1.00%
Short Term Investments Unobservable Input Range	1.00%

X

- Definition

The balance represents the amount of securities secured by corporate securities.

+ References

No definition available.

+ Details

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X

- Definition

The percentage range that represents the amount of securities secured by corporate securities.

+ References

No definition available.

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X

- Definition

Embedded derivatives related to funds held by the ceding insurer on behalf the reinsurer, including funds held in trust, under reinsurance treaties or contracts with the assuming insurer as security for the payment of the obligations thereunder, which represent an asset for the reinsurer. There is another concept for the corresponding liability of the ceding insurer.

+ References

No definition available.

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- Definition

Embedded derivatives related to funds held by the ceding insurer on behalf the reinsurer, including funds held in trust, under reinsurance treaties or contracts with the assuming insurer as security for the payment of the obligations thereunder, which represent an asset for the reinsurer. There is another concept for the corresponding liability of the ceding insurer. Value represents the percentage range and weighted average.

+ References

No definition available.

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- Definition

Fair Value, Assets Measured on Recurring Basis, Reinsurance ceded receivable - embedded derivatives.

+ References

No definition available.

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- Definition

Fair Value, Assets Measured on Recurring Basis, Reinsurance ceded receivable - embedded derivatives. Value represents the percentage range and weighted average.

+ References

No definition available.

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- Definition

Fair Value, Liabilities Measured on Recurring Basis, Interest-sensitive contract liabilities - embedded derivatives - indexed annuities.

+ References

No definition available.

+ Details

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- Definition

Fair Value, Liabilities Measured on Recurring Basis, Interest-sensitive contract liabilities - embedded derivatives - indexed annuities. Value represents the percentage range and weighted average value.

+ References

No definition available.

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- Definition

Fair Value, Liabilities Measured on Recurring Basis, Interest-sensitive contract liabilities - embedded derivatives - variable annuities.

+ References

No definition available.

+ Details

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- Definition

Fair Value, Liabilities Measured on Recurring Basis, Interest-sensitive contract liabilities - embedded derivatives - variable annuities. Value Represents the percentage range and weighted average value.

+ References

No definition available.

+ Details

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Period Type:	instant

X

- Definition

The percentage range that represents the amount of securities secured by short term investments.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The balance represents the amount of securities secured by state and political subdivision securities.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

The range of unobservable input percentages that represent the amount of securities secured by state and political subdivision securities.

+ References

No definition available.

+ Details

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Namespace Prefix:	rga_
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X

- Definition

Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 7

-Section 03

-Paragraph 1

-Subparagraph g



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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