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MRBs (Reconciles of MRBs Assets and Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Market Risk Benefit [Line Items] |  |  |
MRB assets | $ 2,807 | $ 1,888 |
MRB liabilities | 2,078 | 4,399 |
Net (Asset) Liability | (729) | 2,511 |
Variable Annuities [Member] |  |  |
Market Risk Benefit [Line Items] |  |  |
MRB assets | 2,666 | 1,784 |
MRB liabilities | 2,004 | 4,182 |
Net (Asset) Liability | (662) | 2,398 | $ 5,207
Fixed Annuity [Member] |  |  |
Market Risk Benefit [Line Items] |  |  |
MRB assets | 117 | 91 |
MRB liabilities | 72 | 205 |
Net (Asset) Liability | (45) | 114 | 118
Retirement Plan Services Segment [Member] |  |  |
Market Risk Benefit [Line Items] |  |  |
MRB assets | 24 | 13 |
MRB liabilities | 2 | 12 |
Net (Asset) Liability | $ (22) | $ (1) | $ 9

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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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