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Investments (Schedule Of Sources Of Net Investment Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Net Investment Income [Line Items] |  |  |
Gross investment income | $ 3,920 | $ 3,643 | $ 3,551
Investment expenses | (178) | (187) | (176)
Net investment income | 3,742 | 3,456 | 3,375
Amortization of Debt Issuance Costs and Discounts | (41) | (84) | (116)
Fixed maturities |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income | 3,594 | 3,300 | 3,321
Short-term investments |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income | 81 | 35 | 48
Other interest income |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income | 42 | 11 | 19
Equity securities |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income | 99 | 150 | 81
Other Investments |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income | $ 104 | $ 147 | $ 82

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