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Investments (Summary Of Components Of Net Realized Capital Gains (Losses)) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items] |  |  |
Net realized gains (losses) from dispositions | $ 38 | $ 50 | $ (11)
Gains (losses) from fair value adjustments | (460) | 236 | 280
Total net realized gains (losses) on investments | (455) | 258 | 268
Beginning Balance | (30) | (2) |
Credit losses on securities where credit losses were not previously recorded | (35) | (29) |
Increases in allowance on previously impaired securities | (21) | (5) |
Decrease in allowance on previously impaired securities |  |  |
Reduction in allowance due to disposals | 23 | 6 |
Ending Balance | (63) | (30) | (2)
Fixed Maturity Securities [Member] | Market Value [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Allowance for credit losses | (33) | (28) | (2)
Net realized gains (losses) from dispositions | (87) | 17 | (5)
Gains (losses) from fair value adjustments |  |  | 2
Corporate Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Allowance for credit losses | (2) |  |
Beginning Balance | (19) | (1) |
Credit losses on securities where credit losses were not previously recorded | (13) | (21) |
Increases in allowance on previously impaired securities | (20) | (3) |
Decrease in allowance on previously impaired securities |  |  |
Reduction in allowance due to disposals | 6 | 6 |
Ending Balance | (46) | (19) | (1)
Equity Securities [Member] | Fair Value [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gains (losses) from fair value adjustments | (460) | 236 | 278
Total net realized gains (losses) on investments | 112 | 28 | (9)
Other Invested Assets [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Total net realized gains (losses) on investments | 13 | 6 | 2
Short-Term Investments [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Total net realized gains (losses) on investments |  |  | 1
Asset Backed Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Allowance for credit losses | (6) |  |
Beginning Balance | (8) |  |
Credit losses on securities where credit losses were not previously recorded | (6) | (5) |
Increases in allowance on previously impaired securities |  | (3) |
Decrease in allowance on previously impaired securities |  |  |
Reduction in allowance due to disposals | 8 |  |
Ending Balance | (6) | (8) |
Foreign Corporate Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Allowance for credit losses | (1) |  |
Beginning Balance | (3) | (1) |
Credit losses on securities where credit losses were not previously recorded | (17) | (2) |
Increases in allowance on previously impaired securities | (1) |  |
Decrease in allowance on previously impaired securities |  |  |
Reduction in allowance due to disposals | 10 |  |
Ending Balance | $ (11) | $ (3) | $ (1)

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