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Market Risk Benefits (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Market Risk Benefit [Line Items] |  |  |  |
Market risk benefits, at fair value | $ 228 |  | $ 258 |
Insurance, Other | Americas [Member] | Other Segments |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |
Market Risk Benefit, after Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change | 214 | $ 259 | 249 | $ 247
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change | (4) | (18) | $ 253 | $ 263
Market Risk Benefit, Interest Expense | 3 | 4 |  |
Market Risk Benefit, Attributed Fee Collected | 6 | 6 |  |
Market Risk Benefit, Benefit Payment | 0 | 0 |  |
Market Risk Benefit, Increase (Decrease) from Future Expected Policyholder Behavior Assumption | (25) | 21 |  |
Market Risk Benefit, Increase (Decrease) from Interest Rate Change | (21) | (17) |  |
Market Risk Benefit, Increase (Decrease) from Equity Market Change | 0 | (5) |  |
Market Risk Benefit, Increase (Decrease) from Volatility | (4) | 0 |  |
Market Risk Benefit, Increase (Decrease) from Other Assumption | 6 | 5 |  |
Market Risk Benefit, Increase (Decrease) from Actual Policyholder Behavior Different from Expected | 218 | 277 |  |
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, before Tax | 214 | 259 |  |
Market Risk Benefit, Reinsurance Recoverable, after Allowance | 0 | 0 |  |
Market risk benefits, at fair value | $ 1,329 | $ 1,428 |  |
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age | 71 years | 71 years |  |

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