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Investments (Schedule of Securities Pledged by Contractual Maturity) (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities Lending | $ 296 | $ 298
Total gross secured borrowings | 296 | 298
Corporate Bonds [Member] |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Total gross secured borrowings | 279 | 288
Equity Securities [Member] |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Total gross secured borrowings | 9 | 8
Foreign Government Bonds [Member] |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Total gross secured borrowings | 8 | 2
Overnight and Continuous [Member] |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Total gross secured borrowings | 296 | 298
Overnight and Continuous [Member] | Corporate Bonds [Member] |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Total gross secured borrowings | 279 | 288
Overnight and Continuous [Member] | Equity Securities [Member] |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Total gross secured borrowings | 9 | 8
Overnight and Continuous [Member] | Foreign Government Bonds [Member] |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Total gross secured borrowings | $ 8 | $ 2

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