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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Unpaid losses and loss adjustment expenses $ 37,855 $ 36,517    
Adverse Development Cover Navigators Group [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Deferred Revenue 118      
Group Benefits        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Cumulative Incurred for Accident Years Displayed in Triangles 20,299      
Cumulative Paid for Accident Years Displayed in Triangles (13,703)      
Unpaid for Accident Years not Displayed in Triangles 2,553      
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 200      
Discount (1,353) (1,401) $ (1,505)  
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 7,996 8,009 8,206 $ 8,303
Reinsurance and Other Recoverables (237) (247) (239) (209)
Unpaid losses and loss adjustment expenses 8,233 $ 8,256 $ 8,445 $ 8,512
Group long-term disability | Group Benefits        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Cumulative Incurred for Accident Years Displayed in Triangles 14,411      
Cumulative Paid for Accident Years Displayed in Triangles (8,420)      
Unpaid for Accident Years not Displayed in Triangles 1,554      
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 182      
Discount (1,233)      
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 6,494      
Reinsurance and Other Recoverables (227)      
Unpaid losses and loss adjustment expenses 6,721      
Group life and accident, excluding premium waiver | Group Benefits        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Cumulative Incurred for Accident Years Displayed in Triangles 5,888      
Cumulative Paid for Accident Years Displayed in Triangles (5,283)      
Unpaid for Accident Years not Displayed in Triangles 163      
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 4      
Discount (17)      
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 755      
Reinsurance and Other Recoverables (3)      
Unpaid losses and loss adjustment expenses 758      
Group short-term disability | Group Benefits        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Unpaid for Accident Years not Displayed in Triangles 117      
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 4      
Discount 0      
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 121      
Reinsurance and Other Recoverables 0      
Unpaid losses and loss adjustment expenses 121      
Group life premium waiver | Group Benefits        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Unpaid for Accident Years not Displayed in Triangles 688      
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 10      
Discount (103)      
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 595      
Reinsurance and Other Recoverables (2)      
Unpaid losses and loss adjustment expenses 597      
Group supplemental health | Group Benefits        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Unpaid for Accident Years not Displayed in Triangles 31      
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 0      
Discount 0      
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 31      
Reinsurance and Other Recoverables (5)      
Unpaid losses and loss adjustment expenses $ 36