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Fair Value Disclosures (Details) (USD $) | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | $ 22,291,614,000 | $ 16,200,950,000
Funds withheld at interest - embedded derivatives | (243,177,000) | (361,456,000)
Fair Value Assets Measured On Recurring Basis Short Term Investments | 239,131,000 | 46,671,000
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 419,861,000 | 462,945,000
Cash and Cash Equivalents, Fair Value Disclosure | 575,864,000 | 504,522,000
Reinsurance ceded receivable - embedded derivatives | 0 | 4,945,000
Total | 23,283,293,000 | 16,858,577,000
Liabilities, Fair Value Disclosure [Abstract] |  |
Interest-sensitive contract liabilities - embedded derivatives | 912,361,000 | 1,028,241,000
Total | 944,013,000 | 1,057,891,000
Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 533,349,000 | 612,945,000
Funds withheld at interest - embedded derivatives | 0 | 0
Fair Value Assets Measured On Recurring Basis Short Term Investments | 178,923,000 | 37,155,000
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 225,401,000 | 150,639,000
Cash and Cash Equivalents, Fair Value Disclosure | 575,864,000 | 504,522,000
Reinsurance ceded receivable - embedded derivatives | 0 | 0
Total | 1,513,537,000 | 1,305,261,000
Liabilities, Fair Value Disclosure [Abstract] |  |
Interest-sensitive contract liabilities - embedded derivatives | 0 | 0
Total | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 19,520,344,000 | 14,212,340,000
Funds withheld at interest - embedded derivatives | 0 | 0
Fair Value Assets Measured On Recurring Basis Short Term Investments | 38,177,000 | 9,516,000
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 194,460,000 | 300,817,000
Cash and Cash Equivalents, Fair Value Disclosure | 0 | 0
Reinsurance ceded receivable - embedded derivatives | 0 | 0
Total | 19,752,981,000 | 14,522,673,000
Liabilities, Fair Value Disclosure [Abstract] |  |
Interest-sensitive contract liabilities - embedded derivatives | 0 | 0
Total | 31,652,000 | 29,650,000
Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 2,237,921,000 | 1,375,665,000
Funds withheld at interest - embedded derivatives | (243,177,000) | (361,456,000)
Fair Value Assets Measured On Recurring Basis Short Term Investments | 22,031,000 | 0
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 0 | 11,489,000
Cash and Cash Equivalents, Fair Value Disclosure | 0 | 0
Reinsurance ceded receivable - embedded derivatives | 0 | 4,945,000
Total | 2,016,775,000 | 1,030,643,000
Liabilities, Fair Value Disclosure [Abstract] |  |
Interest-sensitive contract liabilities - embedded derivatives | 912,361,000 | 1,028,241,000
Total | 912,361,000 | 1,028,241,000
Interest Rate Swap [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities | 196,000 | 3,171,000
Interest Rate Swap [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities | 0 | 0
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities | 196,000 | 3,171,000
Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities | 0 | 0
Credit Default Swap [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities | 1,953,000 | 5,633,000
Credit Default Swap [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities | 0 | 0
Credit Default Swap [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities | 1,953,000 | 5,633,000
Credit Default Swap [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities | 0 | 0
Currency Swap [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities | 27,398,000 | 23,710,000
Currency Swap [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities | 0 | 0
Currency Swap [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities | 27,398,000 | 23,710,000
Currency Swap [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities | 0 | 0
Equity Swap [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities |  | (2,864,000)
Equity Swap [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities |  | 0
Equity Swap [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities |  | (2,864,000)
Equity Swap [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities |  | 0
Foreign Exchange Forward [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities | 2,105,000 |
Foreign Exchange Forward [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities | 0 |
Foreign Exchange Forward [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities | 2,105,000 |
Foreign Exchange Forward [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities | 0 |
Nonredeemable Preferred Stock [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 74,841,000 | 78,183,000
Nonredeemable Preferred Stock [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 64,268,000 | 58,906,000
Nonredeemable Preferred Stock [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 10,573,000 | 19,277,000
Nonredeemable Preferred Stock [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 0 | 0
Equity Securities, Other [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 147,859,000 | 35,717,000
Equity Securities, Other [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 147,859,000 | 5,308,000
Equity Securities, Other [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 0 | 18,920,000
Equity Securities, Other [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 0 | 11,489,000
Interest Rate Swap [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 104,972,000 | 168,484,000
Interest Rate Swap [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 0 | 0
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 104,972,000 | 168,484,000
Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 0 | 0
Future [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 0 | 0
Future [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 0 | 0
Future [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 0 | 0
Future [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 0 | 0
Foreign Exchange Forward [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 1,017,000 | 4,560,000
Foreign Exchange Forward [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 0 | 0
Foreign Exchange Forward [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 1,017,000 | 4,560,000
Foreign Exchange Forward [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 0 | 0
Consumer Price Index Swap [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 1,446,000 | 766,000
Consumer Price Index Swap [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 0 | 0
Consumer Price Index Swap [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 1,446,000 | 766,000
Consumer Price Index Swap [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 0 | 0
Credit Default Swap [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | (1,741,000) | (4,003,000)
Credit Default Swap [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 0 | 0
Credit Default Swap [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | (1,741,000) | (4,003,000)
Credit Default Swap [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 0 | 0
Equity Swap [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 62,514,000 | 87,243,000
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities | 0 |
Equity Swap [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 0 | 0
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities | 0 |
Equity Swap [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 62,514,000 | 87,243,000
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities | 0 |
Equity Swap [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 0 | 0
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities | 0 |
Currency Swap [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 0 | 0
Currency Swap [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 0 | 0
Currency Swap [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 0 | 0
Currency Swap [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 0 | 0
Securities Pledged as Collateral [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 17,002,000 | 32,622,000
Securities Pledged as Collateral [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 1,323,000 | 27,052,000
Securities Pledged as Collateral [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 15,679,000 | 5,570,000
Securities Pledged as Collateral [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 0 | 0
Other Invested Assets [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 11,951,000 | 59,373,000
Other Invested Assets [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 11,951,000 | 59,373,000
Other Invested Assets [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 0 | 0
Other Invested Assets [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair Value Assets Measured On Recurring Basis Other Invested Assets | 0 | 0
Corporate Debt Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 12,380,071,000 | 7,461,106,000
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 43,544,000 | 76,097,000
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 10,667,964,000 | 6,410,840,000
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 1,668,563,000 | 974,169,000
Canadian Provincial Governments [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 4,049,334,000 | 3,869,933,000
Canadian Provincial Governments [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 0 | 0
Canadian Provincial Governments [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 4,049,334,000 | 3,869,933,000
Canadian Provincial Governments [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 0 | 0
Residential Mortgage Backed Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 1,042,064,000 | 1,227,234,000
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 0 | 0
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 948,133,000 | 1,145,579,000
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 93,931,000 | 81,655,000
Asset-backed Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 691,555,000 | 401,991,000
Asset-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 0 | 0
Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 459,164,000 | 208,499,000
Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 232,391,000 | 193,492,000
Commercial Mortgage Backed Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 1,698,903,000 | 1,242,219,000
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 0 | 0
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 1,531,897,000 | 1,126,243,000
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 167,006,000 | 115,976,000
US Treasury and Government [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 265,190,000 | 374,002,000
US Treasury and Government [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 192,780,000 | 300,514,000
US Treasury and Government [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 67,872,000 | 73,488,000
US Treasury and Government [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 4,538,000 | 0
US States and Political Subdivisions Debt Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 302,498,000 | 205,386,000
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 0 | 12,894,000
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 259,286,000 | 182,119,000
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 43,212,000 | 10,373,000
Foreign Government Debt Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 1,861,999,000 | 1,419,079,000
Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 297,025,000 | 223,440,000
Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 1,536,694,000 | 1,195,639,000
Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | $ 28,280,000 | $ 0

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. + Details
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- Definition Fair Value, Assets Measured on Recurring Basis, Other Invested Assets. + References No definition available. + Details
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Namespace Prefix: | rga_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant

X
- Definition Fair Value, Assets Measured on Recurring Basis, Reinsurance ceded receivable - embedded derivatives. + References No definition available. + Details
Name: | rga_FairValueAssetsMeasuredOnRecurringBasisReinsuranceCededReceivableEmbeddedDerivatives
Namespace Prefix: | rga_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant

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- Definition Fair Value, Measured on Recurring Basis, Short Term Investments. + References No definition available. + Details
Name: | rga_FairValueAssetsMeasuredOnRecurringBasisShortTermInvestments
Namespace Prefix: | rga_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Fair Value, Liabilities Measured on Recurring Basis, Interest-sensitive contract liabilities - embedded derivatives. + References No definition available. + Details
Name: | rga_FairValueLiabilitiesMeasuredOnRecurringBasisGuaranteedInterestContractsEmbeddedDerivatives
Namespace Prefix: | rga_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Fair Value, Liabilities Measured on Recurring Basis, Other Liabilities. + References No definition available. + Details
Name: | rga_FairValueLiabilitiesMeasuredOnRecurringBasisOtherLiabilities
Namespace Prefix: | rga_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This element represents the aggregate of the liabilities reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | rga_LiabilitiesFairValueDisclosureRecurring
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Data Type: | xbrli:monetaryItemType
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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureRecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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- Definition For an unclassified balance sheet, total of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15C -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 137 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6379932&loc=d3e22054-111558 + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 8, 9, 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8 -Footnote 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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