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Market Risk Benefits - Market Risk Benefits In Asset and Liability Positions (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2021
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Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Market risk benefit assets | $ 1,981 | $ 800 | [1] | $ 944 |
Market risk benefit liabilities | 5,467 | 5,864 | [1] | 10,175 |
Net Liability | 3,486 | 5,064 |  | 9,231 | $ 19,852
Reclassified to "Assets and Liabilities held-for- sale" | 0 | 0 |  | (4,340) |
Retirement Strategies | Assets Held-For-Sale |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Reclassified to "Assets and Liabilities held-for- sale" |  |  |  | (102) |
Retirement Strategies | Liabilities Held-For-Sale |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Reclassified to "Assets and Liabilities held-for- sale" |  |  |  | (4,442) |
Other Businesses |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Market risk benefit assets | 14 | 13 |  | 17 |
Market risk benefit liabilities | 78 | 114 |  | 187 |
Net Liability | 64 | 101 |  | 170 |
Individual Variable | Retirement Strategies |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Market risk benefit assets | 1,967 | 787 |  | 927 |
Market risk benefit liabilities | 5,389 | 5,750 |  | 9,988 |
Net Liability | $ 3,422 | $ 4,963 |  | $ 9,061 | $ 19,473
[1] | Prior period amounts adjusted for the implementation of ASU 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.

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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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