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Business and Basis of Presentation (Cost of Reinsurance) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | ---
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Additional insurance reserves, including amounts in AOCI, EOP, post-flooring | $ 14,439 | $ 12,822 | $ 11,934 |  |
Variable/ Universal Life | Other liabilities | Individual Life |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Additional insurance reserves, including amounts in AOCI, EOP, post-flooring |  |  |  | $ 3,259 |
Less: Reinsurance recoverable |  |  |  | 580 |
Total balance after reinsurance recoverable |  |  |  | 3,839 |
Variable/ Universal Life | As Previously Reported | Other liabilities | Individual Life |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Additional insurance reserves, including amounts in AOCI, EOP, post-flooring |  |  |  |  | $ 3,058
Variable/ Universal Life | Effect Of Application Of Accounting Standards Update 2018-12, Unwinding Amounts Related To Unrealized Investment Gains And Losses | Other liabilities | Individual Life |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Effect of actual variances from expected experience and other activity |  |  |  | (659) |
Variable/ Universal Life | Effect Of Application Of Accounting Standards Update 2018-12, Balance Prior To Transition, Excluding Amounts Related To Unrealized Investment Gains And Losses | Other liabilities | Individual Life |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Additional insurance reserves, including amounts in AOCI, EOP, post-flooring |  |  |  | 2,399 |
Variable/ Universal Life | Effect Of Application Of Accounting Standards Update 2018-12, Impact From Updates To Certain Universal Life Contract Liabilities | Other liabilities | Individual Life |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Effect of actual variances from expected experience and other activity |  |  |  | $ 860 |

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- Definition Amount, after effect of reinsurance, of present value of total expected payment to policyholder in excess of present value of total expected assessment. Excludes benefit classified as market risk benefit or under provisions of Topic 815 on derivative and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 + Details
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- Definition Amount, before effect of reinsurance and after current period update of cash flow assumption and discount rate change, of present value of total expected payment to policyholder in excess of present value of total expected assessment. Excludes benefit classified as market risk benefit or under provisions of Topic 815 on derivative and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 + Details
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