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Reserves for Unpaid Losses and Loss Adjustment Expenses Level 4 Historical Loss Development Triangles, Group (Details) - Group Insurance Policies [Member]
number in Millions, $ in Millions
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Dec. 31, 2008
USD ($)
Dec. 31, 2007
USD ($)
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net $ 14,369                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 9,391                  
Long-term Disability [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 11,293                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 6,570                  
Accident and Health Insurance Product Line [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 3,076                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 2,821                  
Short-duration Insurance Contracts, Accident Year 2007 [Member] | Long-term Disability [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 1,143 $ 1,146 $ 1,151 $ 1,154 $ 1,154 $ 1,160 $ 1,158 $ 1,177 $ 1,290 $ 1,375
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 906 869 828 781 726 661 585 495 340 $ 81
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0                  
Short-duration Insurance Contracts, Number of Reported Claims 27,251                  
Short-duration Insurance Contracts, Accident Year 2008 [Member] | Long-term Disability [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net $ 1,241 1,239 1,243 1,249 1,250 1,237 1,250 1,311 1,415  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 930 883 831 771 701 618 520 357 $ 81  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0                  
Short-duration Insurance Contracts, Number of Reported Claims 27,811                  
Short-duration Insurance Contracts, Accident Year 2009 [Member] | Long-term Disability [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net $ 1,318 1,328 1,344 1,335 1,343 1,363 1,414 1,441    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 960 906 843 769 682 573 391 $ 88    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0                  
Short-duration Insurance Contracts, Number of Reported Claims 29,788                  
Short-duration Insurance Contracts, Accident Year 2010 [Member] | Long-term Disability [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net $ 1,344 1,351 1,376 1,367 1,397 1,471 1,542      
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 940 878 805 718 608 419 $ 98      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0                  
Short-duration Insurance Contracts, Number of Reported Claims 30,432                  
Short-duration Insurance Contracts, Accident Year 2011 [Member] | Long-term Disability [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net $ 1,310 1,318 1,313 1,317 1,405 1,503        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 860 790 707 595 410 $ 98        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0                  
Short-duration Insurance Contracts, Number of Reported Claims 30,406                  
Short-duration Insurance Contracts, Accident Year 2012 [Member] | Long-term Disability [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net $ 1,135 1,141 1,143 1,199 1,358          
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 689 620 526 362 $ 84          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 1                  
Short-duration Insurance Contracts, Number of Reported Claims 27,357                  
Short-duration Insurance Contracts, Accident Year 2013 [Member] | Long-term Disability [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net $ 940 954 985 1,121            
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 520 435 289 $ 69            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 1                  
Short-duration Insurance Contracts, Number of Reported Claims 20,376                  
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Long-term Disability [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net $ 936 969 1,051              
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 427 284 67              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 3                  
Short-duration Insurance Contracts, Number of Reported Claims 19,879                  
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Accident and Health Insurance Product Line [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net $ 975 973 982              
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 970 958 $ 777              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 2                  
Short-duration Insurance Contracts, Number of Reported Claims 25,589                  
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Long-term Disability [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net $ 923 985                
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 275 67                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 11                  
Short-duration Insurance Contracts, Number of Reported Claims 18,916                  
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Accident and Health Insurance Product Line [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net $ 1,012 1,022                
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 1,000 $ 809                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 7                  
Short-duration Insurance Contracts, Number of Reported Claims 24,473                  
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Long-term Disability [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net $ 1,003                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 63                  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 371                  
Short-duration Insurance Contracts, Number of Reported Claims 12,748                  
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Accident and Health Insurance Product Line [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net $ 1,089                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 851                  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 190                  
Short-duration Insurance Contracts, Number of Reported Claims 19,445