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Investments (Schedule Of Amortized Cost and Fair Value of Available-for-Sale Securities) (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 109,355 |  | $ 93,355 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | (158) | $ (193) | (169) | $ (147) | $ (78) | $ (14)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 310 |  | 174 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax | (9,741) |  | (8,140) |  |  |
Available for sale, Fair Value | 99,766 |  | 85,220 |  |  |
U.S. Treasury / Agency |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 3,944 |  | 2,792 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  | 0 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 2 |  | 5 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax | (265) |  | (171) |  |  |
Available for sale, Fair Value | 3,681 |  | 2,626 |  |  |
Non-U.S. |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 34,912 |  | 28,064 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | (53) |  | (59) |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 239 |  | 108 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax | (2,381) |  | (2,205) |  |  |
Available for sale, Fair Value | 32,717 |  | 25,908 |  |  |
Corporate and asset-backed securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 44,932 |  | 40,547 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | (104) |  | (107) |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 61 |  | 49 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax | (4,034) |  | (3,534) |  |  |
Available for sale, Fair Value | 40,855 |  | 36,955 |  |  |
Mortgage-backed securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 22,402 |  | 17,871 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | (1) |  | (3) |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 6 |  | 4 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax | (2,802) |  | (2,021) |  |  |
Available for sale, Fair Value | 19,605 |  | 15,851 |  |  |
Municipal |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 3,165 |  | 4,081 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  | 0 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 2 |  | 8 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax | (259) |  | (209) |  |  |
Available for sale, Fair Value | $ 2,908 |  | $ 3,880 |  |  |

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