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Reserve for Unpaid Losses and Loss Adjustment Expenses - Historical Loss Development Triangles, Group (Details) - Group Benefits
claim in Millions, $ in Millions
Dec. 31, 2021
USD ($)
claim
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles $ 20,436                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 13,863                  
Group long-term disability                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 14,113                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 8,219                  
Group life and accident, excluding premium waiver                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 6,323                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 5,644                  
2012 | Group long-term disability                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 1,474 $ 1,479 $ 1,486 $ 1,504 $ 1,515 $ 1,530 $ 1,532 $ 1,539 $ 1,605 $ 1,829
IBNR Reserves $ 0                  
Claims Reported | claim 35,814                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,227 1,185 1,138 1,080 1,014 933 835 708 483 $ 108
2013 | Group long-term disability                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 1,378 1,385 1,399 1,413 1,416 1,429 1,429 1,479 1,660  
IBNR Reserves $ 0                  
Claims Reported | claim 30,757                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,113 1,067 1,016 954 881 791 664 443 $ 102  
2014 | Group long-term disability                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 1,389 1,395 1,408 1,431 1,431 1,430 1,473 1,636    
IBNR Reserves $ 0                  
Claims Reported | claim 31,927                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,079 1,025 960 884 801 675 448 $ 103    
2015 | Group long-term disability                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 1,380 1,385 1,401 1,420 1,422 1,442 1,595      
IBNR Reserves $ 0                  
Claims Reported | claim 32,727                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,025 962 891 806 687 460 $ 108      
2016 | Group long-term disability                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 1,409 1,417 1,437 1,468 1,481 1,651        
IBNR Reserves $ 0                  
Claims Reported | claim 33,301                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 981 907 819 705 479 $ 112        
2017 | Group long-term disability                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 1,304 1,316 1,358 1,413 1,597          
IBNR Reserves $ 1                  
Claims Reported | claim 30,902                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 842 757 658 452 $ 109          
2018 | Group long-term disability                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 1,277 1,309 1,387 1,647            
IBNR Reserves $ 1                  
Claims Reported | claim 28,403                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 743 639 447 $ 105            
2019 | Group long-term disability                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 1,327 1,424 1,650              
IBNR Reserves $ 5                  
Claims Reported | claim 27,375                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 650 454 101              
2019 | Group life and accident, excluding premium waiver                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 1,867 1,866 1,902              
IBNR Reserves $ 9                  
Claims Reported | claim 57,811                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,847 1,830 $ 1,471              
2020 | Group long-term disability                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 1,407 1,686                
IBNR Reserves $ 29                  
Claims Reported | claim 25,503                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 458 100                
2020 | Group life and accident, excluding premium waiver                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 2,072 2,072                
IBNR Reserves $ 21                  
Claims Reported | claim 60,509                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 2,033 $ 1,524                
2021 | Group long-term disability                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 1,768                  
IBNR Reserves $ 881                  
Claims Reported | claim 17,132                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 101                  
2021 | Group life and accident, excluding premium waiver                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 2,384                  
IBNR Reserves $ 467                  
Claims Reported | claim 51,507                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,764