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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Unpaid losses and loss adjustment expenses $ 41,243 $ 39,659    
Group Benefits        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Cumulative Incurred for Accident Years Displayed in Triangles 20,590      
Cumulative Paid for Accident Years Displayed in Triangles (14,088)      
Unpaid for Accident Years not Displayed in Triangles 2,399      
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 219      
Discount (1,205) (1,304) $ (1,353)  
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 7,915 7,965 7,996 $ 8,009
Reinsurance and Other Recoverables (245) (245) (237) (247)
Unpaid losses and loss adjustment expenses 8,160 $ 8,210 $ 8,233 $ 8,256
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 14,081      
Cumulative Paid for Accident Years Displayed in Triangles (8,142)      
Unpaid for Accident Years not Displayed in Triangles 1,510      
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 193      
Discount (1,107)      
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 6,535      
Reinsurance and Other Recoverables (231)      
Unpaid losses and loss adjustment expenses 6,766      
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 6,509      
Cumulative Paid for Accident Years Displayed in Triangles (5,946)      
Unpaid for Accident Years not Displayed in Triangles 161      
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 5      
Discount (15)      
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 714      
Reinsurance and Other Recoverables (7)      
Unpaid losses and loss adjustment expenses 721      
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 126      
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 8      
Discount 0      
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 134      
Reinsurance and Other Recoverables 0      
Unpaid losses and loss adjustment expenses 134      
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 565      
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 13      
Discount (83)      
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 495      
Reinsurance and Other Recoverables (2)      
Unpaid losses and loss adjustment expenses 497      
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 37      
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 0      
Discount      
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 37      
Reinsurance and Other Recoverables (5)      
Unpaid losses and loss adjustment expenses $ 42