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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Unpaid losses and loss adjustment expenses $ 39,659 $ 37,855    
Group Benefits        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Cumulative Incurred for Accident Years Displayed in Triangles 20,436      
Cumulative Paid for Accident Years Displayed in Triangles (13,863)      
Unpaid for Accident Years not Displayed in Triangles 2,487      
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 209      
Discount (1,304) (1,353) $ (1,401)  
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 7,965 7,996 8,009 $ 8,206
Reinsurance and Other Recoverables (245) (237) (247) (239)
Unpaid losses and loss adjustment expenses 8,210 $ 8,233 $ 8,256 $ 8,445
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 14,113      
Cumulative Paid for Accident Years Displayed in Triangles (8,219)      
Unpaid for Accident Years not Displayed in Triangles 1,546      
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 189      
Discount (1,192)      
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 6,437      
Reinsurance and Other Recoverables (234)      
Unpaid losses and loss adjustment expenses 6,671      
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 6,323      
Cumulative Paid for Accident Years Displayed in Triangles (5,644)      
Unpaid for Accident Years not Displayed in Triangles 163      
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 4      
Discount (18)      
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 828      
Reinsurance and Other Recoverables (5)      
Unpaid losses and loss adjustment expenses 833      
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 124      
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 5      
Discount 0      
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 129      
Reinsurance and Other Recoverables 0      
Unpaid losses and loss adjustment expenses 129      
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 620      
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 11      
Discount (94)      
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 537      
Reinsurance and Other Recoverables (1)      
Unpaid losses and loss adjustment expenses 538      
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 34      
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 0      
Discount      
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 34      
Reinsurance and Other Recoverables (5)      
Unpaid losses and loss adjustment expenses $ 39