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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, 2017
USD ($)
claim
Dec. 31, 2016
USD ($)
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 $ 16,350            
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 10,488            
Group long-term disability              
Claims Development [Line Items]              
Cumulative Incurred for Accident Years Displayed in Triangles 10,511            
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 5,138            
Group life and accident, excluding premium waiver              
Claims Development [Line Items]              
Cumulative Incurred for Accident Years Displayed in Triangles 5,839            
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 5,350            
2011 | Group long-term disability              
Claims Development [Line Items]              
Cumulative Incurred for Accident Years Displayed in Triangles 1,649 $ 1,660 $ 1,669 $ 1,659 $ 1,660 $ 1,761 $ 1,917
IBNR Reserves $ 1            
Claims Reported | claim 39,149            
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 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 1,515 1,530 1,532 1,539 1,605 1,829  
IBNR Reserves $ 0            
Claims Reported | claim 37,438            
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,014 933 835 708 483 $ 108  
2013 | Group long-term disability              
Claims Development [Line Items]              
Cumulative Incurred for Accident Years Displayed in Triangles 1,416 1,429 1,429 1,479 1,660    
IBNR Reserves $ 2            
Claims Reported | claim 31,752            
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 881 791 664 443 $ 102    
2014 | Group long-term disability              
Claims Development [Line Items]              
Cumulative Incurred for Accident Years Displayed in Triangles 1,431 1,430 1,473 1,636      
IBNR Reserves $ 2            
Claims Reported | claim 32,936            
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 801 675 448 $ 103      
2015 | Group long-term disability              
Claims Development [Line Items]              
Cumulative Incurred for Accident Years Displayed in Triangles 1,422 1,442 1,595        
IBNR Reserves $ 15            
Claims Reported | claim 33,349            
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 687 460 108        
2015 | Group life and accident, excluding premium waiver              
Claims Development [Line Items]              
Cumulative Incurred for Accident Years Displayed in Triangles 1,921 1,919 1,983        
IBNR Reserves $ 8            
Claims Reported | claim 47,954            
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,911 1,889 $ 1,541        
2016 | Group long-term disability              
Claims Development [Line Items]              
Cumulative Incurred for Accident Years Displayed in Triangles 1,481 1,651          
IBNR Reserves $ 38            
Claims Reported | claim 33,413            
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 479 112          
2016 | Group life and accident, excluding premium waiver              
Claims Development [Line Items]              
Cumulative Incurred for Accident Years Displayed in Triangles 1,919 1,974          
IBNR Reserves $ 23            
Claims Reported | claim 44,762            
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,888 $ 1,529          
2017 | Group long-term disability              
Claims Development [Line Items]              
Cumulative Incurred for Accident Years Displayed in Triangles 1,597            
IBNR Reserves $ 687            
Claims Reported | claim 23,158            
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 109            
2017 | Group life and accident, excluding premium waiver              
Claims Development [Line Items]              
Cumulative Incurred for Accident Years Displayed in Triangles 1,999            
IBNR Reserves $ 401            
Claims Reported | claim 35,592            
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,551