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Investments (Schedule of Securities Pledged by Contractual Maturity) (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities Lending | $ 161 | $ 114
Corporate Bonds [Member] |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities Lending | 160 | 114
Foreign Government Bonds [Member] |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities Lending | 1 |
Overnight and Continuous [Member] |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities Lending | 161 | 114
Overnight and Continuous [Member] | Corporate Bonds [Member] |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities Lending | 160 | $ 114
Overnight and Continuous [Member] | Foreign Government Bonds [Member] |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities Lending | $ 1 |

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- Definition The amount of cash received as security in return for loaning securities to another party under securities lending agreements. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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