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Business and Basis of Presentation (Non-Participating Traditional and Limited-Pay Loss Recognition Reserves/Profit Followed by Losses Liability) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | ---
Other businesses |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change | $ 1,716 | $ 1,921 | $ 2,623 |  |
Institutional | Retirement Strategies |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change | 141,135 | 117,754 | 142,593 |  | $ 144,315
Life Planner | International Businesses |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change | 79,822 | 78,639 | 109,562 |  | 117,484
Gibraltar Life and Other | International Businesses |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change | 79,036 | 80,331 | 114,846 |  | 124,342
Long - Term Care | Total Corporate and Other |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change | $ 12,139 | $ 10,685 | $ 15,810 |  | 17,365
Non-Participating Traditional and Limited-Pay Loss Recognition Reserves |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change |  |  |  | $ 0 |
Non-Participating Traditional and Limited-Pay Loss Recognition Reserves | Other businesses |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change |  |  |  | 0 |
Non-Participating Traditional and Limited-Pay Loss Recognition Reserves | As Previously Reported |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change |  |  |  |  | 3,715
Liability For Future Policy Benefit, Expected Future Policy Benefit, Before Reinsurance, After Discount Rate Change, Excluding Amounts Related To Unrealized Investment Gains And Losses |  |  |  | 52 |
Non-Participating Traditional and Limited-Pay Loss Recognition Reserves | As Previously Reported | Other businesses |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change |  |  |  |  | 145
Liability For Future Policy Benefit, Expected Future Policy Benefit, Before Reinsurance, After Discount Rate Change, Excluding Amounts Related To Unrealized Investment Gains And Losses |  |  |  | 40 |
Non-Participating Traditional and Limited-Pay Loss Recognition Reserves | Effect Of Application Of Accounting Standards Update 2018-12, Unwinding Amounts Related To Unrealized Investment Gains And Losses |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  | (3,663) |
Non-Participating Traditional and Limited-Pay Loss Recognition Reserves | Effect Of Application Of Accounting Standards Update 2018-12, Unwinding Amounts Related To Unrealized Investment Gains And Losses | Other businesses |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  | (105) |
Non-Participating Traditional and Limited-Pay Loss Recognition Reserves | Effect Of Application Of Accounting Standards Update 2018-12, Derecognizing LRR & PFL |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  | (52) |
Non-Participating Traditional and Limited-Pay Loss Recognition Reserves | Effect Of Application Of Accounting Standards Update 2018-12, Derecognizing LRR & PFL | Other businesses |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  | (40) |
Non-Participating Traditional and Limited-Pay Loss Recognition Reserves | Life Planner | International Businesses |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change |  |  |  | 0 |
Non-Participating Traditional and Limited-Pay Loss Recognition Reserves | Life Planner | As Previously Reported | International Businesses |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change |  |  |  |  | 181
Liability For Future Policy Benefit, Expected Future Policy Benefit, Before Reinsurance, After Discount Rate Change, Excluding Amounts Related To Unrealized Investment Gains And Losses |  |  |  | 12 |
Non-Participating Traditional and Limited-Pay Loss Recognition Reserves | Life Planner | Effect Of Application Of Accounting Standards Update 2018-12, Unwinding Amounts Related To Unrealized Investment Gains And Losses | International Businesses |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  | (169) |
Non-Participating Traditional and Limited-Pay Loss Recognition Reserves | Life Planner | Effect Of Application Of Accounting Standards Update 2018-12, Derecognizing LRR & PFL | International Businesses |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  | (12) |
Non-Participating Traditional and Limited-Pay Loss Recognition Reserves | Gibraltar Life and Other | International Businesses |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change |  |  |  | 0 |
Non-Participating Traditional and Limited-Pay Loss Recognition Reserves | Gibraltar Life and Other | As Previously Reported | International Businesses |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change |  |  |  |  | 670
Liability For Future Policy Benefit, Expected Future Policy Benefit, Before Reinsurance, After Discount Rate Change, Excluding Amounts Related To Unrealized Investment Gains And Losses |  |  |  | 0 |
Non-Participating Traditional and Limited-Pay Loss Recognition Reserves | Gibraltar Life and Other | Effect Of Application Of Accounting Standards Update 2018-12, Unwinding Amounts Related To Unrealized Investment Gains And Losses | International Businesses |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  | (670) |
Non-Participating Traditional and Limited-Pay Loss Recognition Reserves | Gibraltar Life and Other | Effect Of Application Of Accounting Standards Update 2018-12, Derecognizing LRR & PFL | International Businesses |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  | 0 |
Non-Participating Traditional and Limited-Pay Loss Recognition Reserves | Long - Term Care | Total Corporate and Other |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change |  |  |  | 0 |
Non-Participating Traditional and Limited-Pay Loss Recognition Reserves | Long - Term Care | As Previously Reported | Total Corporate and Other |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change |  |  |  |  | 734
Liability For Future Policy Benefit, Expected Future Policy Benefit, Before Reinsurance, After Discount Rate Change, Excluding Amounts Related To Unrealized Investment Gains And Losses |  |  |  | 0 |
Non-Participating Traditional and Limited-Pay Loss Recognition Reserves | Long - Term Care | Effect Of Application Of Accounting Standards Update 2018-12, Unwinding Amounts Related To Unrealized Investment Gains And Losses | Total Corporate and Other |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  | (734) |
Non-Participating Traditional and Limited-Pay Loss Recognition Reserves | Long - Term Care | Effect Of Application Of Accounting Standards Update 2018-12, Derecognizing LRR & PFL | Total Corporate and Other |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  | 0 |
Institutional Retirement Strategies | Non-Participating Traditional and Limited-Pay Loss Recognition Reserves | Institutional | Retirement Strategies |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change |  |  |  | 0 |
Institutional Retirement Strategies | Non-Participating Traditional and Limited-Pay Loss Recognition Reserves | Institutional | As Previously Reported | Retirement Strategies |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change |  |  |  |  | $ 1,985
Liability For Future Policy Benefit, Expected Future Policy Benefit, Before Reinsurance, After Discount Rate Change, Excluding Amounts Related To Unrealized Investment Gains And Losses |  |  |  | 0 |
Institutional Retirement Strategies | Non-Participating Traditional and Limited-Pay Loss Recognition Reserves | Institutional | Effect Of Application Of Accounting Standards Update 2018-12, Unwinding Amounts Related To Unrealized Investment Gains And Losses | Retirement Strategies |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  | (1,985) |
Institutional Retirement Strategies | Non-Participating Traditional and Limited-Pay Loss Recognition Reserves | Institutional | Effect Of Application Of Accounting Standards Update 2018-12, Derecognizing LRR & PFL | Retirement Strategies |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  | $ 0 |

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