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Investments (Schedule Of Amortized Cost And Fair Value Of Held-to-Maturity Fixed Maturities) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Debt Securities, Held-to-maturity | $ 8,882 | $ 10,153 |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 34 | 35 | $ 44
Debt securities, held to maturity, net carrying value | 8,848 | 10,118 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 3 | 533 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (412) | (4) |
Held to maturity, Fair Value | 8,439 | 10,647 |
U.S. Treasury / Agency |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Debt Securities, Held-to-maturity | 1,417 | 1,213 |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 0 | 0 |
Debt securities, held to maturity, net carrying value | 1,417 | 1,213 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 1 | 34 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (48) | (3) |
Held to maturity, Fair Value | 1,370 | 1,244 |
Non-U.S. |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Debt Securities, Held-to-maturity | 1,140 | 1,201 |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 4 | 5 |
Debt securities, held to maturity, net carrying value | 1,136 | 1,196 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 66 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (82) | 0 |
Held to maturity, Fair Value | 1,054 | 1,262 |
Corporate and asset-backed securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Debt Securities, Held-to-maturity | 1,733 | 2,032 |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 28 | 28 |
Debt securities, held to maturity, net carrying value | 1,705 | 2,004 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 1 | 197 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (126) | 0 |
Held to maturity, Fair Value | 1,580 | 2,201 |
Mortgage-backed securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Debt Securities, Held-to-maturity | 1,456 | 1,731 |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 1 | 1 |
Debt securities, held to maturity, net carrying value | 1,455 | 1,730 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 74 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (104) | (1) |
Held to maturity, Fair Value | 1,351 | 1,803 |
Municipal |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Debt Securities, Held-to-maturity | 3,136 | 3,976 |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 1 | 1 |
Debt securities, held to maturity, net carrying value | 3,135 | 3,975 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 1 | 162 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (52) | 0 |
Held to maturity, Fair Value | $ 3,084 | $ 4,137 |

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