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Investments (Schedule Of Amortized Cost and Fair Value of Available-for-Sale Securities) (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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Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 93,316 |  | $ 90,493 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | (147) | $ (78) | (14) | $ (12) | $ (11) | $ (20)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 119 |  | 3,220 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax | (9,547) |  | (591) |  |  |
Available for sale, Fair Value | 83,741 |  | 93,108 |  |  |
U.S. Treasury / Agency |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 2,725 |  | 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 | (174) |  | (6) |  |  |
Available for sale, Fair Value | 2,556 |  | 2,214 |  |  |
Non-U.S. |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 26,766 |  | 25,156 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | (61) |  | (8) |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 77 |  | 953 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax | (2,599) |  | (272) |  |  |
Available for sale, Fair Value | 24,183 |  | 25,829 |  |  |
Corporate and asset-backed securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 40,776 |  | 37,844 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | (85) |  | (6) |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 30 |  | 1,410 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax | (4,341) |  | (185) |  |  |
Available for sale, Fair Value | 36,380 |  | 39,063 |  |  |
Mortgage-backed securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 18,425 |  | 20,080 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | (1) |  | 0 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1 |  | 532 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax | (2,190) |  | (123) |  |  |
Available for sale, Fair Value | 16,235 |  | 20,489 |  |  |
Municipal |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 4,624 |  | 5,302 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  | 0 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 6 |  | 216 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax | (243) |  | (5) |  |  |
Available for sale, Fair Value | $ 4,387 |  | $ 5,513 |  |  |

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