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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, 2020
USD ($)
claim
Dec. 31, 2019
USD ($)
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 ($)
Dec. 31, 2011
USD ($)
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles $ 20,299                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 13,703                  
Group long-term disability                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 14,411                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 8,420                  
Group life and accident, excluding premium waiver                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 5,888                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 5,283                  
2011 | Group long-term disability                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 1,615 $ 1,631 $ 1,638 $ 1,649 $ 1,660 $ 1,669 $ 1,659 $ 1,660 $ 1,761 $ 1,917
IBNR Reserves $ 0                  
Claims Reported | claim 37,347                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,324 1,286 1,231 1,167 1,087 996 886 743 508 $ 118
2012 | Group long-term disability                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 1,479 1,486 1,504 1,515 1,530 1,532 1,539 1,605 1,829  
IBNR Reserves $ 0                  
Claims Reported | claim 35,626                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 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 1,385 1,399 1,413 1,416 1,429 1,429 1,479 1,660    
IBNR Reserves $ 0                  
Claims Reported | claim 30,611                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 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 1,395 1,408 1,431 1,431 1,430 1,473 1,636      
IBNR Reserves $ 0                  
Claims Reported | claim 31,756                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 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 1,385 1,401 1,420 1,422 1,442 1,595        
IBNR Reserves $ 0                  
Claims Reported | claim 32,527                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 962 891 806 687 460 $ 108        
2016 | Group long-term disability                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 1,417 1,437 1,468 1,481 1,651          
IBNR Reserves $ 1                  
Claims Reported | claim 33,244                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 907 819 705 479 $ 112          
2017 | Group long-term disability                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 1,316 1,358 1,413 1,597            
IBNR Reserves $ 2                  
Claims Reported | claim 30,883                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 757 658 452 $ 109            
2018 | Group long-term disability                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 1,309 1,387 1,647              
IBNR Reserves $ 6                  
Claims Reported | claim 28,364                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 639 447 105              
2018 | Group life and accident, excluding premium waiver                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 1,950 1,940 1,952              
IBNR Reserves $ 10                  
Claims Reported | claim 52,500                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,929 1,916 $ 1,532              
2019 | Group long-term disability                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 1,424 1,650                
IBNR Reserves $ 38                  
Claims Reported | claim 27,136                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 454 101                
2019 | Group life and accident, excluding premium waiver                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 1,866 1,902                
IBNR Reserves $ 19                  
Claims Reported | claim 57,109                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,830 $ 1,471                
2020 | Group long-term disability                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 1,686                  
IBNR Reserves $ 885                  
Claims Reported | claim 15,861                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 100                  
2020 | Group life and accident, excluding premium waiver                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 2,072                  
IBNR Reserves $ 401                  
Claims Reported | claim 46,597                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,524