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Reserve for Unpaid Losses and Loss Adjustment Expenses - Historical Loss Development Triangles, Group (Details) - Group Insurance Policies
claim in Millions, $ in Millions
Dec. 31, 2018
USD ($)
claim
Dec. 31, 2017
USD ($)
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 Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 11,584              
Cumulative Incurred for Accident Years Displayed in Triangles 17,754              
Group long-term disability                
Claims Development [Line Items]                
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 6,217              
Cumulative Incurred for Accident Years Displayed in Triangles 11,934              
Group life and accident, excluding premium waiver                
Claims Development [Line Items]                
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 5,367              
Cumulative Incurred for Accident Years Displayed in Triangles 5,820              
2011 | Group long-term disability                
Claims Development [Line Items]                
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 1,231 $ 1,167 $ 1,087 $ 996 $ 886 $ 743 $ 508 $ 118
Cumulative Incurred for Accident Years Displayed in Triangles 1,638 1,649 1,660 1,669 1,659 1,660 1,761 $ 1,917
IBNR Reserves $ 1              
Claims Reported | claim 39,097              
2012 | Group long-term disability                
Claims Development [Line Items]                
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,080 1,014 933 835 708 483 108  
Cumulative Incurred for Accident Years Displayed in Triangles 1,504 1,515 1,530 1,532 1,539 1,605 $ 1,829  
IBNR Reserves $ 1              
Claims Reported | claim 37,343              
2013 | Group long-term disability                
Claims Development [Line Items]                
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 954 881 791 664 443 102    
Cumulative Incurred for Accident Years Displayed in Triangles 1,413 1,416 1,429 1,429 1,479 $ 1,660    
IBNR Reserves $ 1              
Claims Reported | claim 31,755              
2014 | Group long-term disability                
Claims Development [Line Items]                
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 884 801 675 448 103      
Cumulative Incurred for Accident Years Displayed in Triangles 1,431 1,431 1,430 1,473 $ 1,636      
IBNR Reserves $ 3              
Claims Reported | claim 32,970              
2015 | Group long-term disability                
Claims Development [Line Items]                
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 806 687 460 108        
Cumulative Incurred for Accident Years Displayed in Triangles 1,420 1,422 1,442 $ 1,595        
IBNR Reserves $ 5              
Claims Reported | claim 33,541              
2015 | Group life and accident, excluding premium waiver                
Claims Development [Line Items]                
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,906 1,888 1,529          
Cumulative Incurred for Accident Years Displayed in Triangles 1,915 1,919 1,974          
IBNR Reserves $ 5              
Claims Reported | claim 45,206              
2016 | Group long-term disability                
Claims Development [Line Items]                
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 705 479 112          
Cumulative Incurred for Accident Years Displayed in Triangles 1,468 1,481 $ 1,651          
IBNR Reserves $ 12              
Claims Reported | claim 34,259              
2016 | Group life and accident, excluding premium waiver                
Claims Development [Line Items]                
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,929 1,551            
Cumulative Incurred for Accident Years Displayed in Triangles 1,953 1,999            
IBNR Reserves $ 20              
Claims Reported | claim 44,539              
2017 | Group long-term disability                
Claims Development [Line Items]                
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 452 109            
Cumulative Incurred for Accident Years Displayed in Triangles 1,413 $ 1,597            
IBNR Reserves $ 36              
Claims Reported | claim 31,135              
2017 | Group life and accident, excluding premium waiver                
Claims Development [Line Items]                
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,532              
Cumulative Incurred for Accident Years Displayed in Triangles 1,952              
IBNR Reserves $ 376              
Claims Reported | claim 41,876              
2018 | Group long-term disability                
Claims Development [Line Items]                
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 105              
Cumulative Incurred for Accident Years Displayed in Triangles 1,647              
IBNR Reserves $ 810              
Claims Reported | claim 19,386