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Investments (Schedule Of Amortized Cost and Fair Value of Available-for-Sale Securities) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost | $ 93,355 | $ 90,493 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | (169) | (14) | $ (20)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 174 | 3,220 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (8,140) | (591) |
Available for sale, Fair Value | 85,220 | 93,108 |
U.S. Treasury / Agency |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost | 2,792 | 2,111 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 5 | 109 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (171) | (6) |
Available for sale, Fair Value | 2,626 | 2,214 |
Non-U.S. |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost | 28,064 | 25,156 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | (59) | (8) |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 108 | 953 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (2,205) | (272) |
Available for sale, Fair Value | 25,908 | 25,829 |
Corporate and asset-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost | 40,547 | 37,844 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | (107) | (6) |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 49 | 1,410 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (3,534) | (185) |
Available for sale, Fair Value | 36,955 | 39,063 |
Mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost | 17,871 | 20,080 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | (3) | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 4 | 532 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (2,021) | (123) |
Available for sale, Fair Value | 15,851 | 20,489 |
Municipal |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost | 4,081 | 5,302 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 8 | 216 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (209) | (5) |
Available for sale, Fair Value | $ 3,880 | $ 5,513 |

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