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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, 2020 | Dec. 31, 2019
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With Hedge Designation [Member] | Interest Rate Swaps [Member] |  |
Gross Estimated Fair Values of Derivative Positions [Abstract] |  |
Contractual/notional amount | $ 715 | $ 715
Liability, estimated fair value | (32) | (8)
Without Hedge Designation [Member] | Options [Member] | Purchased [Member] |  |
Gross Estimated Fair Values of Derivative Positions [Abstract] |  |
Contractual/notional amount |  | 57
Asset, estimated fair value |  | 1
Without Hedge Designation [Member] | Options [Member] | Written [Member] |  |
Gross Estimated Fair Values of Derivative Positions [Abstract] |  |
Contractual/notional amount |  | 100
Liability, estimated fair value |  | (1)
Without Hedge Designation [Member] | Embedded Derivative on Funds Withheld Liability [Member] |  |
Gross Estimated Fair Values of Derivative Positions [Abstract] |  |
Contractual/notional amount | 196 | 182
Liability, estimated fair value | $ (1) | $ (7)

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