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Market Risk Benefits - Significant Inputs and Assumptions (Details) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Market Risk Benefit [Line Items] |  |  |  |  |
Market risk benefits | $ 1,133 | $ 1,841 | $ 1,103 | $ 2,901 | $ 4,829
Increase (decrease) from change in assumptions | $ 0 | $ 0 | (139) | $ 123 |
Utilization of guaranteed withdrawals |  |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |  |
Increase (decrease) from change in assumptions |  |  | (39) |  |
Surrender rate |  |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |  |
Increase (decrease) from change in assumptions |  |  | (200) |  |
Mortality rate |  |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |  |
Increase (decrease) from change in assumptions |  |  | $ (49) |  |
Discounted cash flow | Nonperformance risk |  |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |  |
Market risk benefits, measurement input | 0.0115 |  | 0.0095 |  |
Minimum | Discounted cash flow | Utilization of guaranteed withdrawals |  |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |  |
Market risk benefits, measurement input | 0.000 |  | 0.000 |  |
Minimum | Discounted cash flow | Surrender rate |  |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |  |
Market risk benefits, measurement input | 0.002 |  | 0.002 |  |
Minimum | Discounted cash flow | Market volatility |  |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |  |
Market risk benefits, measurement input | 0.000 |  | 0.000 |  |
Minimum | Discounted cash flow | Mortality rate |  |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |  |
Market risk benefits, measurement input | 0.000 |  | 0.000 |  |
Maximum | Discounted cash flow | Utilization of guaranteed withdrawals |  |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |  |
Market risk benefits, measurement input | 0.480 |  | 0.480 |  |
Maximum | Discounted cash flow | Surrender rate |  |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |  |
Market risk benefits, measurement input | 0.456 |  | 0.456 |  |
Maximum | Discounted cash flow | Market volatility |  |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |  |
Market risk benefits, measurement input | 0.251 |  | 0.266 |  |
Maximum | Discounted cash flow | Mortality rate |  |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |  |
Market risk benefits, measurement input | 0.416 |  | 0.416 |  |
Weighted average | Discounted cash flow | Utilization of guaranteed withdrawals |  |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |  |
Market risk benefits, measurement input | 0.111 |  | 0.110 |  |
Weighted average | Discounted cash flow | Surrender rate |  |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |  |
Market risk benefits, measurement input | 0.036 |  | 0.036 |  |
Weighted average | Discounted cash flow | Market volatility |  |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |  |
Market risk benefits, measurement input | 0.111 |  | 0.121 |  |
Weighted average | Discounted cash flow | Nonperformance risk |  |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |  |
Market risk benefits, measurement input | 0.0115 |  | 0.0095 |  |
Weighted average | Discounted cash flow | Mortality rate |  |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |  |
Market risk benefits, measurement input | 0.015 |  | 0.015 |  |

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- Definition Amount, before effect of reinsurance and after accumulated increase (decrease) in instrument-specific credit risk, of contract or contract feature in long-duration contract issued by insurance entity that both protects contract holder from other-than-nominal capital market risk and exposes insurance entity to other-than-nominal capital market risk. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (h)(1) -URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 55 -Paragraph 29G -URI https://asc.fasb.org/extlink&oid=126561865&loc=SL117819547-158441 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 7B -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124506351&loc=SL117782768-158439 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 45 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=124509262&loc=SL117780254-158436 + Details
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