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Investments (Schedule Of Amortized Cost and Fair Value of Available-for-Sale Securities) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 113,479 | $ 111,128 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | (115) | (156) | $ (168) | $ (169)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,012 | 1,148 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax | (6,087) | (5,549) |  |
Available for sale, Fair Value | 108,289 | 106,571 |  |
U.S. Treasury / Agency |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 3,058 | 3,721 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 5 | 13 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax | (164) | (144) |  |
Available for sale, Fair Value | 2,899 | 3,590 |  |
Non-U.S. |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 36,962 | 35,918 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | (41) | (49) |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 605 | 592 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax | (1,381) | (1,297) |  |
Available for sale, Fair Value | 36,145 | 35,164 |  |
Corporate and asset-backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 45,567 | 44,695 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | (73) | (104) |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 306 | 390 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax | (2,353) | (2,151) |  |
Available for sale, Fair Value | 43,447 | 42,830 |  |
Mortgage-backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 25,696 | 23,720 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | (1) | (3) |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 89 | 143 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax | (2,029) | (1,802) |  |
Available for sale, Fair Value | 23,755 | 22,058 |  |
Municipal |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 2,196 | 3,074 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 7 | 10 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax | (160) | (155) |  |
Available for sale, Fair Value | $ 2,043 | $ 2,929 |  |

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