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Business and Basis of Presentation (Liability for Future Policy Benefits-Benefits Reserve) (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    
Less: Reinsurance recoverable 69 76 5    
Total balance after reinsurance recoverable, EOP 1,563 1,758 2,500    
Institutional | Retirement Strategies          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance 155,886 137,924 128,887   $ 122,806
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change 141,135 117,754 142,593   144,315
Less: Reinsurance recoverable 5,539 0 0    
Total balance after reinsurance recoverable, EOP 64,250 65,135 74,129    
Term Life | Individual Life          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance 20,186 20,300 18,892   18,263
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change 19,852 19,288 22,768   23,400
Less: Reinsurance recoverable 744 708 532    
Total balance after reinsurance recoverable, EOP 7,834 7,298 9,266    
Life Planner | International Businesses          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance 80,385 82,358 88,008   89,820
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change 79,822 78,639 109,562   117,484
Less: Reinsurance recoverable 102 126 142    
Total balance after reinsurance recoverable, EOP 50,674 47,930 69,907    
Gibraltar Life and Other | International Businesses          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance 86,391 91,597 101,370   106,079
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change 79,036 80,331 114,846   124,342
Less: Reinsurance recoverable 202 203 279    
Total balance after reinsurance recoverable, EOP 52,473 51,317 76,753    
Long - Term Care | Total Corporate and Other          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance 12,742 11,901 11,328   11,456
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change 12,139 10,685 15,810   17,365
Less: Reinsurance recoverable 0 0 0    
Total balance after reinsurance recoverable, EOP $ 8,852 $ 7,753 $ 12,225    
Benefit reserves          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance       $ 204,683  
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change       267,553  
Less: Reinsurance recoverable       1,279  
Total balance after reinsurance recoverable, EOP       266,274  
Benefit reserves | Other businesses          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance       6,625  
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change       12,006  
Less: Reinsurance recoverable       13  
Total balance after reinsurance recoverable, EOP       11,993  
Benefit reserves | As Previously Reported          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance         209,018
Benefit reserves | As Previously Reported | Other businesses          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance         6,624
Benefit reserves | Effect Of Application Of Accounting Standards Update 2018-12, Changes In Cash Flow Assumptions And Other Activity          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change       (4,335)  
Benefit reserves | Effect Of Application Of Accounting Standards Update 2018-12, Changes In Cash Flow Assumptions And Other Activity | 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       1  
Benefit reserves | Effect Of Application Of Accounting Standards Update 2018-12, Cumulative Changes In Discount Rate Assumptions And Other Activity          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change       62,870  
Benefit reserves | Effect Of Application Of Accounting Standards Update 2018-12, Cumulative Changes In Discount Rate Assumptions And Other Activity | 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       5,381  
Benefit reserves | Institutional | Retirement Strategies          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance       61,578  
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change       75,126  
Less: Reinsurance recoverable       0  
Total balance after reinsurance recoverable, EOP       75,126  
Benefit reserves | Institutional | As Previously Reported | Retirement Strategies          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance         65,383
Benefit reserves | Institutional | Effect Of Application Of Accounting Standards Update 2018-12, Changes In Cash Flow Assumptions And Other Activity | 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       (3,805)  
Benefit reserves | Institutional | Effect Of Application Of Accounting Standards Update 2018-12, Cumulative Changes In Discount Rate Assumptions And Other Activity | 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       13,548  
Benefit reserves | Term Life | Individual Life          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance       7,887  
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change       10,549  
Less: Reinsurance recoverable       799  
Total balance after reinsurance recoverable, EOP       9,750  
Benefit reserves | Term Life | As Previously Reported | Individual Life          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance         7,887
Benefit reserves | Term Life | Effect Of Application Of Accounting Standards Update 2018-12, Changes In Cash Flow Assumptions And Other Activity | Individual Life          
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  
Benefit reserves | Term Life | Effect Of Application Of Accounting Standards Update 2018-12, Cumulative Changes In Discount Rate Assumptions And Other Activity | Individual Life          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change       2,662  
Benefit reserves | Life Planner | International Businesses          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance       51,617  
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change       74,207  
Less: Reinsurance recoverable       160  
Total balance after reinsurance recoverable, EOP       74,047  
Benefit 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, Original Discount Rate, before Cash Flow and Reinsurance         51,607
Benefit reserves | Life Planner | Effect Of Application Of Accounting Standards Update 2018-12, Changes In Cash Flow Assumptions And Other Activity | 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       10  
Benefit reserves | Life Planner | Effect Of Application Of Accounting Standards Update 2018-12, Cumulative Changes In Discount Rate Assumptions And Other Activity | 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       22,590  
Benefit reserves | Gibraltar Life and Other | International Businesses          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance       69,019  
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change       82,803  
Less: Reinsurance recoverable       307  
Total balance after reinsurance recoverable, EOP       82,496  
Benefit 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, Original Discount Rate, before Cash Flow and Reinsurance         69,542
Benefit reserves | Gibraltar Life and Other | Effect Of Application Of Accounting Standards Update 2018-12, Changes In Cash Flow Assumptions And Other Activity | 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       (523)  
Benefit reserves | Gibraltar Life and Other | Effect Of Application Of Accounting Standards Update 2018-12, Cumulative Changes In Discount Rate Assumptions And Other Activity | 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       13,784  
Benefit 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, Original Discount Rate, before Cash Flow and Reinsurance       7,957  
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change       12,862  
Less: Reinsurance recoverable       0  
Total balance after reinsurance recoverable, EOP       12,862  
Benefit 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, Original Discount Rate, before Cash Flow and Reinsurance         $ 7,975
Benefit reserves | Long - Term Care | Effect Of Application Of Accounting Standards Update 2018-12, Changes In Cash Flow Assumptions And Other Activity | 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       (18)  
Benefit reserves | Long - Term Care | Effect Of Application Of Accounting Standards Update 2018-12, Cumulative Changes In Discount Rate Assumptions And Other Activity | 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       $ 4,905