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Market Risk Benefits (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2021 | Dec. 31, 2020
Market Risk Benefit [Line Items] |  |  |  |  |  |
Market Risk Benefit, Net Amount at Risk | $ 261 |  | $ 247 |  |  |
Accounting Standards Update 2018-12 |  |  |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |  |  |
Market Risk Benefit, Net Amount at Risk |  |  | 247 | $ 262 |  |
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 | 259 | $ 233 | 247 | 262 |  |
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change | (18) | 14 | 263 | 254 |  |
Market Risk Benefit, Interest Expense | 4 | 0 |  |  |  |
Market Risk Benefit, Attributed Fee Collected | 6 | 7 |  |  |  |
Market Risk Benefit, Benefit Payment | 0 | (5) |  |  |  |
Market Risk Benefit, Increase (Decrease) from Future Expected Policyholder Behavior Assumption | 21 | (61) |  |  |  |
Market Risk Benefit, Increase (Decrease) from Interest Rate Change | (17) | 13 |  |  |  |
Market Risk Benefit, Increase (Decrease) from Equity Market Change | (5) | 3 |  |  |  |
Market Risk Benefit, Increase (Decrease) from Volatility | 0 | 2 |  |  |  |
Market Risk Benefit, Increase (Decrease) from Other Assumption | 5 | 6 |  |  |  |
Market Risk Benefit, Increase (Decrease) from Actual Policyholder Behavior Different from Expected | 277 | 219 |  |  |  |
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, before Tax | 259 | 233 |  |  |  |
Market Risk Benefit, Reinsurance Recoverable, after Allowance | 0 | 0 |  |  |  |
Market Risk Benefit, Net Amount at Risk | $ 1,428 | $ 1,220 |  |  |  |
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age | 71 years | 68 years |  |  |  |
Insurance, Other | Americas [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |  |  |
Market Risk Benefit, after Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change |  |  | 247 | 262 | $ 266 | $ 266
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change |  |  | 263 | 254 | 266 | $ 311
Market Risk Benefit, Interest Expense |  |  | 54 | 3 |  |
Market Risk Benefit, Attributed Fee Collected |  |  | 28 | 12 |  |
Market Risk Benefit, Benefit Payment |  |  | (9) | (14) |  |
Market Risk Benefit, Increase (Decrease) from Future Expected Policyholder Behavior Assumption |  |  | 18 | 25 |  |
Market Risk Benefit, Increase (Decrease) from Interest Rate Change |  |  | (175) | (51) |  |
Market Risk Benefit, Increase (Decrease) from Equity Market Change |  |  | 48 | (49) |  |
Market Risk Benefit, Increase (Decrease) from Volatility |  |  | 19 | (2) |  |
Market Risk Benefit, Increase (Decrease) from Other Assumption |  |  | 7 | 5 |  |
Market Risk Benefit, Increase (Decrease) from Actual Policyholder Behavior Different from Expected |  |  | 19 | 14 |  |
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, before Tax |  |  | (16) | 8 |  |
Market Risk Benefit, Reinsurance Recoverable, after Allowance |  |  | $ 0 | $ 0 | $ 0 |

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