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MRBs - Reconciles of MRBs Assets and Liabilities (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Market Risk Benefit [Line Items] |  |  |  |
Assets | $ 4,878 | $ 3,894 |  |
Liabilities | 1,266 | 1,716 |  |
Net (Assets) Liabilities | (3,612) | (2,178) |  |
Variable Annuities |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |
Assets | 4,743 | 3,763 |  |
Liabilities | 1,139 | 1,583 |  |
Net (Assets) Liabilities | (3,604) | (2,180) | $ (1,412) | $ (662)
Fixed Annuities |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |
Assets | 96 | 96 |  |
Liabilities | 123 | 128 |  |
Net (Assets) Liabilities | 27 | 32 | (31) | (45)
Retirement Plan Services |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |
Assets | 39 | 35 |  |
Liabilities | 4 | 5 |  |
Net (Assets) Liabilities | $ (35) | $ (30) | $ (26) | $ (22)

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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 -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480016/944-40-65-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29G -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29G Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-7B Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480112/944-40-45-3 + Details
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- Definition Amount of asset position for 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/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29G -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29G Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7B -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-7B + Details
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