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MRBs (Reconciles of MRBs Assets and Liabilities) (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Market Risk Benefit [Line Items] |  |  |
Assets | $ 3,445 | $ 2,807 |
Liabilities | 1,976 | 2,078 |
Net (Assets) Liabilities | (1,469) | (729) |
Retirement Plan Services [Member] |  |  |
Market Risk Benefit [Line Items] |  |  |
Assets | 26 | 24 |
Liabilities |  | 2 |
Net (Assets) Liabilities | (26) | (22) | $ (1)
Variable Annuities [Member] |  |  |
Market Risk Benefit [Line Items] |  |  |
Assets | 3,305 | 2,666 |
Liabilities | 1,893 | 2,004 |
Net (Assets) Liabilities | (1,412) | (662) | 2,398
Fixed Annuities [Member] |  |  |
Market Risk Benefit [Line Items] |  |  |
Assets | 114 | 117 |
Liabilities | 83 | 72 |
Net (Assets) Liabilities | $ (31) | $ (45) | $ 114

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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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