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Reserve for Unpaid Losses and Loss Adjustment Expenses - Reconciliation of Loss Development to Liability for Unpaid Losses and Loss Adjustment Expenses, Group (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Unpaid losses and loss adjustment expenses $ 33,029 $ 32,287    
Group Insurance Policies        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Cumulative Incurred for Accident Years Displayed in Triangles 17,754      
Cumulative Paid for Accident Years Displayed in Triangles (11,584)      
Unpaid for Accident Years not Displayed in Triangles 3,356      
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 185      
Discount (1,505) (1,536) $ (1,303)  
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 8,206 8,303 5,564 $ 5,671
Reinsurance and Other Recoverables 239 209 208 218
Unpaid losses and loss adjustment expenses 8,445 $ 8,512 $ 5,772 $ 5,889
Group Insurance Policies | Group long-term disability        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Cumulative Incurred for Accident Years Displayed in Triangles 11,934      
Cumulative Paid for Accident Years Displayed in Triangles (6,217)      
Unpaid for Accident Years not Displayed in Triangles 2,243      
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 171      
Discount (1,364)      
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 6,767      
Reinsurance and Other Recoverables 235      
Unpaid losses and loss adjustment expenses 7,002      
Group Insurance Policies | Group life and accident, excluding premium waiver        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Cumulative Incurred for Accident Years Displayed in Triangles 5,820      
Cumulative Paid for Accident Years Displayed in Triangles (5,367)      
Unpaid for Accident Years not Displayed in Triangles 139      
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 2      
Discount (19)      
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 575      
Reinsurance and Other Recoverables 2      
Unpaid losses and loss adjustment expenses 577      
Group Insurance Policies | Group short-term disability        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Unpaid for Accident Years not Displayed in Triangles 113      
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 5      
Discount 0      
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 118      
Reinsurance and Other Recoverables 0      
Unpaid losses and loss adjustment expenses 118      
Group Insurance Policies | Group life premium waiver        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Unpaid for Accident Years not Displayed in Triangles 818      
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 7      
Discount (122)      
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 703      
Reinsurance and Other Recoverables 2      
Unpaid losses and loss adjustment expenses 705      
Group Insurance Policies | Group supplemental health        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Unpaid for Accident Years not Displayed in Triangles 43      
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 0      
Discount 0      
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 43      
Reinsurance and Other Recoverables 0      
Unpaid losses and loss adjustment expenses $ 43