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Investments, Aggregate Contractual or Notional Amounts and Estimated Fair Values Related to Derivative Financial Instruments (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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With Hedge Designation [Member] | Interest Rate Swaps [Member] |  |
Gross Estimated Fair Values of Derivative Positions [Abstract] |  |
Contractual/notional amount |  | $ 675
Liability, estimated fair value |  | (26)
Without Hedge Designation [Member] | Interest Rate Swaps [Member] |  |
Gross Estimated Fair Values of Derivative Positions [Abstract] |  |
Contractual/notional amount | $ 100 | 100
Liability, estimated fair value | (2) | (3)
Without Hedge Designation [Member] | Options [Member] | Purchased [Member] |  |
Gross Estimated Fair Values of Derivative Positions [Abstract] |  |
Contractual/notional amount | 200 | 135
Asset, estimated fair value | 2 | 3
Without Hedge Designation [Member] | Embedded Derivative on Funds Withheld Liability [Member] |  |
Gross Estimated Fair Values of Derivative Positions [Abstract] |  |
Contractual/notional amount | 256 | 190
Liability, estimated fair value | $ (2) | $ (19)

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