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Fair Value of Assets and Liabilities (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Funds Withheld At Interest Embedded Derivatives [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance, Beginning of period	$ (156,189)		$ (370,884)		$ (243,177)		$ (361,456)
Total gains or (losses) (realized/unrealized)
Investment income, net of related expenses	0		0		0		0
Investment related gains (losses), net	47,716		(4,453)		134,704		(13,881)
Claims and other policy benefits	0		0		0		0
Interest credited	0		0		0		0
Policy acquisition costs and other insurance expenses	0		0		0		0
Included in other comprehensive income	0		0		0		0
Purchases	0	[1]	0	[1]	0	[1]	0	[1]
Sales	0	[1]	0	[1]	0	[1]	0	[1]
Settlements	0	[1]	0	[1]	0	[1]	0	[1]
Transfers into Level 3	0		0		0		0
Transfers out of Level 3	0		0		0		0
Balance, End of period	(108,473)		(375,337)		(108,473)		(375,337)
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period
Investment income, net of related expenses	0		0		0		0
Investment related gains (losses), net	47,717		(4,452)		134,705		(13,881)
Claims & other policy benefits	0		0		0		0
Interest credited	0		0		0		0
Policy acquisition costs and other insurance expenses	0		0		0		0
Other Debt Securities Member
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance, Beginning of period			11,827				11,489
Total gains or (losses) (realized/unrealized)
Investment income, net of related expenses			0				0
Investment related gains (losses), net			1,098				1,098
Claims and other policy benefits			0				0
Interest credited			0				0
Policy acquisition costs and other insurance expenses			0				0
Included in other comprehensive income			505				843
Purchases			108	[1]			108	[1]
Sales			(3,788)	[1]			(3,788)	[1]
Settlements			0	[1]			0	[1]
Transfers into Level 3			0				0
Transfers out of Level 3			(6,523)				(6,523)
Balance, End of period			3,227				3,227
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period
Investment income, net of related expenses			0				0
Investment related gains (losses), net			(183)				(183)
Claims & other policy benefits			0				0
Interest credited			0				0
Policy acquisition costs and other insurance expenses			0				0
Reinsurance Ceded Receivable Embedded Derivatives [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance, Beginning of period			3,514				4,945
Total gains or (losses) (realized/unrealized)
Investment income, net of related expenses			0				0
Investment related gains (losses), net			0				0
Claims and other policy benefits			0				0
Interest credited			0				0
Policy acquisition costs and other insurance expenses			1,003				(325)
Included in other comprehensive income			0				0
Purchases			0	[1]			0	[1]
Sales			0	[1]			0	[1]
Settlements			(101)	[1]			(204)	[1]
Transfers into Level 3			0				0
Transfers out of Level 3			0				0
Balance, End of period			4,416				4,416
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period
Investment income, net of related expenses			0				0
Investment related gains (losses), net			0				0
Claims & other policy benefits			0				0
Interest credited			0				0
Policy acquisition costs and other insurance expenses			1,143				(46)
Interest Sensitive Contract Liabilities Embedded Derivatives [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance, Beginning of period	(890,476)		(903,282)		(912,361)		(1,028,241)
Total gains or (losses) (realized/unrealized)
Investment income, net of related expenses	0		0		0		0
Investment related gains (losses), net	35,809		(74,929)		87,123		71,446
Claims and other policy benefits	0		(1,721)		0		557
Interest credited	(28,020)		27,825		(61,016)		6,632
Policy acquisition costs and other insurance expenses	0		0		0		0
Included in other comprehensive income	0		0		0		0
Purchases	(14,764)	[1]	(16,107)	[1]	(28,624)	[1]	(39,697)	[1]
Sales	0	[1]	0	[1]	0	[1]	0	[1]
Settlements	18,883	[1]	29,287	[1]	36,310	[1]	50,376	[1]
Transfers into Level 3	0		0		0		0
Transfers out of Level 3	0		0		0		0
Balance, End of period	(878,568)		(938,927)		(878,568)		(938,927)
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period
Investment income, net of related expenses	0		0		0		0
Investment related gains (losses), net	34,788		(76,737)		84,911		67,887
Claims & other policy benefits	0		(1,959)		0		79
Interest credited	(46,902)		(1,288)		(97,326)		(43,395)
Policy acquisition costs and other insurance expenses	0		0		0		0
Short Term Investments Member
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance, Beginning of period	22,001				22,031
Total gains or (losses) (realized/unrealized)
Investment income, net of related expenses	0				(3)
Investment related gains (losses), net	0				0
Claims and other policy benefits	0				0
Interest credited	0				0
Policy acquisition costs and other insurance expenses	0				0
Included in other comprehensive income	(1)				(28)
Purchases	0	[1]			0	[1]
Sales	0	[1]			0	[1]
Settlements	(22,000)	[1]			(22,000)	[1]
Transfers into Level 3	0				0
Transfers out of Level 3	0				0
Balance, End of period	0				0
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period
Investment income, net of related expenses	0				(4)
Investment related gains (losses), net	0				0
Claims & other policy benefits	0				0
Interest credited	0				0
Policy acquisition costs and other insurance expenses	0				0
Fixed maturity securities available-for-sale | Corporate securities
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance, Beginning of period	1,646,903		977,671		1,668,563		974,169
Total gains or (losses) (realized/unrealized)
Investment income, net of related expenses	(2,313)		77		(4,339)		107
Investment related gains (losses), net	350		(696)		(913)		(1,280)
Claims and other policy benefits	0		0		0		0
Interest credited	0		0		0		0
Policy acquisition costs and other insurance expenses	0		0		0		0
Included in other comprehensive income	(37,672)		10,341		(36,710)		9,659
Purchases	100,690	[1]	68,275	[1]	175,362	[1]	89,435	[1]
Sales	(39,793)	[1]	(17,876)	[1]	(56,071)	[1]	(27,285)	[1]
Settlements	(80,533)	[1]	(32,497)	[1]	(145,899)	[1]	(53,371)	[1]
Transfers into Level 3	4,373		0		8,146		17,445
Transfers out of Level 3	0		(11,281)		(16,134)		(14,865)
Balance, End of period	1,592,005		994,014		1,592,005		994,014
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period
Investment income, net of related expenses	(2,191)		84		(4,218)		114
Investment related gains (losses), net	0		(380)		(202)		(1,106)
Claims & other policy benefits	0		0		0		0
Interest credited	0		0		0		0
Policy acquisition costs and other insurance expenses	0		0		0		0
Fixed maturity securities available-for-sale | Residential mortgage-backed securities
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance, Beginning of period	140,717		54,435		93,931		81,655
Total gains or (losses) (realized/unrealized)
Investment income, net of related expenses	(111)		188		(6)		298
Investment related gains (losses), net	198		(315)		25		(36)
Claims and other policy benefits	0		0		0		0
Interest credited	0		0		0		0
Policy acquisition costs and other insurance expenses	0		0		0		0
Included in other comprehensive income	(2,714)		(172)		(200)		1,408
Purchases	11,383	[1]	337	[1]	51,920	[1]	582	[1]
Sales	(1,018)	[1]	(8,219)	[1]	(2,617)	[1]	(16,224)	[1]
Settlements	(7,367)	[1]	(1,902)	[1]	(12,289)	[1]	(3,702)	[1]
Transfers into Level 3	4,306		7,176		14,630		7,176
Transfers out of Level 3	(5,340)		(1,937)		(5,340)		(21,566)
Balance, End of period	140,054		49,591		140,054		49,591
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period
Investment income, net of related expenses	(112)		148		(7)		255
Investment related gains (losses), net	0		(161)		0		(269)
Claims & other policy benefits	0		0		0		0
Interest credited	0		0		0		0
Policy acquisition costs and other insurance expenses	0		0		0		0
Fixed maturity securities available-for-sale | Asset-backed securities
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance, Beginning of period	288,231		146,362		232,391		193,492
Total gains or (losses) (realized/unrealized)
Investment income, net of related expenses	1,526		195		2,405		444
Investment related gains (losses), net	226		164		(1,521)		(506)
Claims and other policy benefits	0		0		0		0
Interest credited	0		0		0		0
Policy acquisition costs and other insurance expenses	0		0		0		0
Included in other comprehensive income	2,601		1,782		14,638		8,477
Purchases	72,542	[1]	2,012	[1]	128,423	[1]	2,012	[1]
Sales	(7,995)	[1]	(7,902)	[1]	(16,293)	[1]	(7,902)	[1]
Settlements	(5,559)	[1]	(3,238)	[1]	(11,436)	[1]	(7,103)	[1]
Transfers into Level 3	5,340		0		8,305		1,080
Transfers out of Level 3	(4,306)		(11,017)		(4,306)		(61,636)
Balance, End of period	352,606		128,358		352,606		128,358
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period
Investment income, net of related expenses	1,515		151		2,397		400
Investment related gains (losses), net	0		0		0		(607)
Claims & other policy benefits	0		0		0		0
Interest credited	0		0		0		0
Policy acquisition costs and other insurance expenses	0		0		0		0
Fixed maturity securities available-for-sale | Commercial mortgage-backed securities
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance, Beginning of period	175,294		118,678		167,006		115,976
Total gains or (losses) (realized/unrealized)
Investment income, net of related expenses	581		545		1,083		1,133
Investment related gains (losses), net	(8,992)		393		(9,862)		(11,682)
Claims and other policy benefits	0		0		0		0
Interest credited	0		0		0		0
Policy acquisition costs and other insurance expenses	0		0		0		0
Included in other comprehensive income	15,445		(2,273)		27,945		11,248
Purchases	0	[1]	0	[1]	0	[1]	0	[1]
Sales	(1,118)	[1]	(1,552)	[1]	(2,722)	[1]	(1,552)	[1]
Settlements	(228)	[1]	(58)	[1]	(2,468)	[1]	(58)	[1]
Transfers into Level 3	0		0		0		10,846
Transfers out of Level 3	0		0		0		(10,178)
Balance, End of period	180,982		115,733		180,982		115,733
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period
Investment income, net of related expenses	580		545		1,081		1,133
Investment related gains (losses), net	(10,109)		0		(10,109)		(12,075)
Claims & other policy benefits	0		0		0		0
Interest credited	0		0		0		0
Policy acquisition costs and other insurance expenses	0		0		0		0
Fixed maturity securities available-for-sale | US Treasury And Government Member
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance, Beginning of period					4,538
Total gains or (losses) (realized/unrealized)
Investment income, net of related expenses					0
Investment related gains (losses), net					0
Claims and other policy benefits					0
Interest credited					0
Policy acquisition costs and other insurance expenses					0
Included in other comprehensive income					0
Purchases					0	[1]
Sales					0	[1]
Settlements					0	[1]
Transfers into Level 3					0
Transfers out of Level 3					(4,538)
Balance, End of period	0				0
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period
Investment income, net of related expenses					0
Investment related gains (losses), net					0
Claims & other policy benefits					0
Interest credited					0
Policy acquisition costs and other insurance expenses					0
Fixed maturity securities available-for-sale | State and political subdivisions
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance, Beginning of period	42,639		5,239		43,212		10,373
Total gains or (losses) (realized/unrealized)
Investment income, net of related expenses	9		9		18		4
Investment related gains (losses), net	(4)		(4)		(8)		(8)
Claims and other policy benefits	0		0		0		0
Interest credited	0		0		0		0
Policy acquisition costs and other insurance expenses	0		0		0		0
Included in other comprehensive income	(1,087)		827		(1,639)		1,233
Purchases	0	[1]	0	[1]	0	[1]	0	[1]
Sales	0	[1]	0	[1]	0	[1]	0	[1]
Settlements	(282)	[1]	(23)	[1]	(308)	[1]	(46)	[1]
Transfers into Level 3	0		8,438		0		8,438
Transfers out of Level 3	0		0		0		(5,508)
Balance, End of period	41,275		14,486		41,275		14,486
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period
Investment income, net of related expenses	9		9		18		4
Investment related gains (losses), net	0		0		0		0
Claims & other policy benefits	0		0		0		0
Interest credited	0		0		0		0
Policy acquisition costs and other insurance expenses	0		0		0		0
Fixed maturity securities available-for-sale | Other foreign government, supranational and foreign government-sponsored enterprises
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance, Beginning of period	27,865				28,280
Total gains or (losses) (realized/unrealized)
Investment income, net of related expenses	(76)				(150)
Investment related gains (losses), net	0				0
Claims and other policy benefits	0				0
Interest credited	0				0
Policy acquisition costs and other insurance expenses	0				0
Included in other comprehensive income	(959)				(1,300)
Purchases	0	[1]			0	[1]
Sales	0	[1]			0	[1]
Settlements	0	[1]			0	[1]
Transfers into Level 3	0				0
Transfers out of Level 3	0				0
Balance, End of period	26,830				26,830
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period
Investment income, net of related expenses	(76)				(150)
Investment related gains (losses), net	0				0
Claims & other policy benefits	0				0
Interest credited	0				0
Policy acquisition costs and other insurance expenses	$ 0				$ 0
[1] The amount reported within purchases, sales and settlements is the purchase price (for purchases) and the sales/settlement proceeds (for sales and settlements) based upon the actual date purchased or sold/settled. Items purchased and sold/settled in the same period are excluded from the rollforward. The Company had no issuances during the period.

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+ References

No definition available.

+ Details

Name:	rga_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsAndLiabilitiesUnrealizedGainLossStillHeldIncludedInEarningsInInterestCredited
Namespace Prefix:	rga_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Gains-losses for the period (unrealized) arising from assets and liabilities measured at fair value on a recurring basis using unobservable inputs (level 3) and still held at the end of the period, which are included in earnings and reported on the income statement line called policy acquisition costs and other insurance expenses.

+ References

No definition available.

+ Details

Name:	rga_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsAndLiabilitiesUnrealizedGainLossStillHeldIncludedInEarningsInPolicyAcquisitionCostsAndOtherInsuranceExpenses
Namespace Prefix:	rga_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Gains-losses for the period (unrealized) arising from assets and liabilities measured at fair value on a recurring basis using unobservable inputs (level 3) and still held at the end of the period, which are included in earnings and reported on the income statement line called investment related gains (losses), net.

+ References

No definition available.

+ Details

Name:	rga_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsAndLiabilitiesUnrealizedGainLossStillHeldIncludedInEarningsInRealizedInvestmentGainLoss
Namespace Prefix:	rga_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Gains-losses for the period (unrealized) arising from assets and liabilities measured at fair value on a recurring basis using unobservable inputs (level 3) and still held at the end of the period, which are included in earnings and reported on the income statement line called investment income, net of related expenses.

+ References

No definition available.

+ Details

Name:	rga_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsAndLiabilitiesUnrealizedGainLossStillHeldIncludedInEarningsNetInvestmentIncome
Namespace Prefix:	rga_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	rga_UnrealizedGainsLossesRecordedInEarningsRelatingToLevelThreeAbstract
Namespace Prefix:	rga_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration