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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