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Investments (Summary Of Components Of Net Realized Capital Gains (Losses)) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Net realized gains (losses) from dispositions | $ 12 | $ 8 | $ (39) | $ 41
Gains (losses) from fair value adjustments | (136) | (5) | (462) | 128
Total net gains (losses) on investments | (129) | (4) | (519) | 139
Beginning Balance | (43) | (25) | (30) | (2)
Credit losses on securities where credit losses were not previously recorded | (9) | (5) | (32) | (27)
Increases in allowance on previously impaired securities | (3) | (3) | (4) | (5)
Decrease in allowance on previously impaired securities |  |  |  |
Reduction in allowance due to disposals | 8 | 1 | 19 | 2
Ending Balance | (47) | (32) | (47) | (32)
Fixed Maturity Securities [Member] | Market Value [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Allowance for credit losses | (5) | (7) | (18) | (30)
Net realized gains (losses) from dispositions | (53) | 6 | (66) | 25
Corporate Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Beginning Balance | (26) | (18) | (19) | (1)
Credit losses on securities where credit losses were not previously recorded | (2) | (5) | (9) | (21)
Increases in allowance on previously impaired securities | (3) |  | (4) | (2)
Decrease in allowance on previously impaired securities |  |  |  |
Reduction in allowance due to disposals |  | 1 | 1 | 2
Ending Balance | (31) | (23) | (31) | (23)
Equity Securities [Member] | Fair Value [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Net realized gains (losses) from dispositions | 58 |  | 15 | 10
Gains (losses) from fair value adjustments | (136) | (5) | (462) | 128
Other Invested Assets [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Net realized gains (losses) from dispositions | 6 | 2 | 11 | 6
Short-Term Investments [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Net realized gains (losses) from dispositions | 1 |  | 1 |
Asset Backed Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Beginning Balance |  | (5) | (8) |
Credit losses on securities where credit losses were not previously recorded | (6) |  | (6) | (5)
Increases in allowance on previously impaired securities |  | (3) |  | (3)
Decrease in allowance on previously impaired securities |  |  |  |
Reduction in allowance due to disposals |  |  | 8 |
Ending Balance | (6) | (8) | (6) | (8)
Foreign Corporate Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Beginning Balance | (17) | (1) | (3) | (1)
Credit losses on securities where credit losses were not previously recorded | (1) |  | (17) | (1)
Increases in allowance on previously impaired securities |  |  | (1) |
Decrease in allowance on previously impaired securities |  |  |  |
Reduction in allowance due to disposals | 8 |  | 10 |
Ending Balance | $ (10) | $ (1) | $ (10) | $ (1)

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