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Derivative Instruments (Narrative) (Details) - Not Designated as Hedging Instrument - USD ($) | Mar. 31, 2022 | Dec. 31, 2021
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Interest rate futures | Long |  |
Derivative [Line Items] |  |
Notional amount | $ 1,300,000,000 | $ 2,200,000,000
Interest rate futures | Short |  |
Derivative [Line Items] |  |
Notional amount | 500,000,000 | 500,000,000
Interest rate swaps | US Dollars | Paying a Fixed Rate |  |
Derivative [Line Items] |  |
Notional amount | 0 | 0
Interest rate swaps | US Dollars | Receiving a Fixed Rate |  |
Derivative [Line Items] |  |
Notional amount | 0 | 0
Foreign currency forward contracts, underwriting and non-investment operations | Long |  |
Derivative [Line Items] |  |
Notional amount | 1,100,000,000 | 915,000,000
Foreign currency forward contracts, underwriting and non-investment operations | Short |  |
Derivative [Line Items] |  |
Notional amount | 270,700,000 | 329,300,000
Foreign currency forward contracts, investment operations | Long |  |
Derivative [Line Items] |  |
Notional amount | 244,100,000 | 245,800,000
Foreign currency forward contracts, investment operations | Short |  |
Derivative [Line Items] |  |
Notional amount | 124,700,000 | 131,000,000
Credit default swaps | Long |  |
Derivative [Line Items] |  |
Notional amount | 0 |
Credit default swaps | Short |  |
Derivative [Line Items] |  |
Notional amount | 124,200,000 | 218,500,000
Total return swaps | Long |  |
Derivative [Line Items] |  |
Notional amount | 0 | 0
Equity futures | Long |  |
Derivative [Line Items] |  |
Notional amount | $ 290,600,000 | $ 74,300,000

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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 + Details
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