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Investments (Net Unrealized Gains Losses on Investments) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Gain (Loss) on Securities [Line Items] |  |  |
Net unrealized gains (losses) on investments | $ (17,251) | $ (25,004) | $ 40,438
Fixed maturities | Available-for-sale | With an allowance |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Net unrealized gains (losses) on investments | (72) | (45) | 23
Fixed maturities | Available-for-sale | Without an allowance |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Net unrealized gains (losses) on investments | (18,045) | (27,545) | 39,467
Derivatives designated as cash flow hedges |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Net unrealized gains (losses) on investments | 869 | 2,616 | 1,019
Derivatives designated as fair value hedges |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Net unrealized gains (losses) on investments | (60) | (54) | (35)
Other investments |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Net unrealized gains (losses) on investments | 57 | $ 24 | $ (36)
Without an allowance | Available-for-sale |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Net unrealized gains (losses) on investments | $ 126 |  |

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