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Business and Basis of Presentation (Unearned Revenue Reserves) (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 |  |
Other businesses |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Total balance after reinsurance recoverable | $ 131 | $ 138 | $ 226 |  |
Policyholder Contract Deposit |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Additional insurance reserves, including amounts in AOCI, EOP, post-flooring |  |  |  | $ 3,176 |
Less: Reinsurance recoverable |  |  |  | 0 |
Total balance after reinsurance recoverable |  |  |  | 3,176 |
Policyholder Contract Deposit | Total Corporate and Other |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Additional insurance reserves, including amounts in AOCI, EOP, post-flooring |  |  |  | 190 |
Less: Reinsurance recoverable |  |  |  | 0 |
Total balance after reinsurance recoverable |  |  |  | 190 |
Policyholder Contract Deposit | Other businesses |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Additional insurance reserves, including amounts in AOCI, EOP, post-flooring |  |  |  | 30 |
Less: Reinsurance recoverable |  |  |  | 0 |
Total balance after reinsurance recoverable |  |  |  | 30 |
As Previously Reported | Policyholder Contract Deposit |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Additional insurance reserves, including amounts in AOCI, EOP, post-flooring |  |  |  |  | $ 2,592
As Previously Reported | Policyholder Contract Deposit | Total Corporate and Other |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Additional insurance reserves, including amounts in AOCI, EOP, post-flooring |  |  |  |  | 152
As Previously Reported | Policyholder Contract Deposit | Other businesses |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Additional insurance reserves, including amounts in AOCI, EOP, post-flooring |  |  |  |  | 30
Effect Of Application Of Accounting Standards Update 2018-12, Changes In Benefit Reserves | Policyholder Contract Deposit |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Effect of actual variances from expected experience and other activity |  |  |  | 584 |
Effect Of Application Of Accounting Standards Update 2018-12, Changes In Benefit Reserves | Policyholder Contract Deposit | Total Corporate and Other |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Effect of actual variances from expected experience and other activity |  |  |  | 38 |
Effect Of Application Of Accounting Standards Update 2018-12, Changes In Benefit Reserves | Policyholder Contract Deposit | Other businesses |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Effect of actual variances from expected experience and other activity |  |  |  | 0 |
Variable/ Universal Life | Policyholder Contract Deposit | Individual Life |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Additional insurance reserves, including amounts in AOCI, EOP, post-flooring |  |  |  | 2,743 |
Less: Reinsurance recoverable |  |  |  | 0 |
Total balance after reinsurance recoverable |  |  |  | 2,743 |
Variable/ Universal Life | As Previously Reported | Policyholder Contract Deposit | Individual Life |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Additional insurance reserves, including amounts in AOCI, EOP, post-flooring |  |  |  |  | 2,204
Variable/ Universal Life | Effect Of Application Of Accounting Standards Update 2018-12, Changes In Benefit Reserves | Policyholder Contract Deposit | Individual Life |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Effect of actual variances from expected experience and other activity |  |  |  | 539 |
Life Planner | Policyholder Contract Deposit | International Businesses |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Additional insurance reserves, including amounts in AOCI, EOP, post-flooring |  |  |  | 163 |
Less: Reinsurance recoverable |  |  |  | 0 |
Total balance after reinsurance recoverable |  |  |  | 163 |
Life Planner | As Previously Reported | Policyholder Contract Deposit | International Businesses |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Additional insurance reserves, including amounts in AOCI, EOP, post-flooring |  |  |  |  | 161
Life Planner | Effect Of Application Of Accounting Standards Update 2018-12, Changes In Benefit Reserves | Policyholder Contract Deposit | International Businesses |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Effect of actual variances from expected experience and other activity |  |  |  | 2 |
Gibraltar Life and Other | Policyholder Contract Deposit | International Businesses |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Additional insurance reserves, including amounts in AOCI, EOP, post-flooring |  |  |  | 50 |
Less: Reinsurance recoverable |  |  |  | 0 |
Total balance after reinsurance recoverable |  |  |  | 50 |
Gibraltar Life and Other | As Previously Reported | Policyholder Contract Deposit | International Businesses |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Additional insurance reserves, including amounts in AOCI, EOP, post-flooring |  |  |  |  | $ 45
Gibraltar Life and Other | Effect Of Application Of Accounting Standards Update 2018-12, Changes In Benefit Reserves | Policyholder Contract Deposit | International Businesses |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Effect of actual variances from expected experience and other activity |  |  |  | $ 5 |

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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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