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Investments (Schedule Of Amortized Cost And Fair Value Of Held-to-Maturity Fixed Maturities) (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
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Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Debt Securities, Held-to-maturity | $ 9,009 |  | $ 10,153 |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | (33) | $ (34) | (35) | $ (35) | $ (37) | $ (44)
Debt securities, held to maturity, net carrying value | 8,976 |  | 10,118 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 1 |  | 533 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (486) |  | (4) |  |  |
Held to maturity, at Fair Value | 8,491 |  | 10,647 |  |  |
U.S. Treasury / Agency |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Debt Securities, Held-to-maturity | 1,281 |  | 1,213 |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 0 |  | 0 |  |  |
Debt securities, held to maturity, net carrying value | 1,281 |  | 1,213 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  | 34 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (52) |  | (3) |  |  |
Held to maturity, at Fair Value | 1,229 |  | 1,244 |  |  |
Non-U.S. |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Debt Securities, Held-to-maturity | 1,046 |  | 1,201 |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | (4) |  | (5) |  |  |
Debt securities, held to maturity, net carrying value | 1,042 |  | 1,196 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  | 66 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (86) |  | 0 |  |  |
Held to maturity, at Fair Value | 956 |  | 1,262 |  |  |
Corporate and asset-backed securities |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Debt Securities, Held-to-maturity | 1,769 |  | 2,032 |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | (27) |  | (28) |  |  |
Debt securities, held to maturity, net carrying value | 1,742 |  | 2,004 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  | 197 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (157) |  | 0 |  |  |
Held to maturity, at Fair Value | 1,585 |  | 2,201 |  |  |
Mortgage-backed securities |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Debt Securities, Held-to-maturity | 1,549 |  | 1,731 |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | (1) |  | (1) |  |  |
Debt securities, held to maturity, net carrying value | 1,548 |  | 1,730 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  | 74 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (110) |  | (1) |  |  |
Held to maturity, at Fair Value | 1,438 |  | 1,803 |  |  |
Municipal |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Debt Securities, Held-to-maturity | 3,364 |  | 3,976 |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | (1) |  | (1) |  |  |
Debt securities, held to maturity, net carrying value | 3,363 |  | 3,975 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 1 |  | 162 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (81) |  | 0 |  |  |
Held to maturity, at Fair Value | $ 3,283 |  | $ 4,137 |  |  |

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