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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Unpaid losses and loss adjustment expenses $ 42,318 $ 41,243    
Group Benefits        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Cumulative Incurred for Accident Years Displayed in Triangles 20,787      
Cumulative Paid for Accident Years Displayed in Triangles (14,121)      
Unpaid for Accident Years not Displayed in Triangles 2,296      
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 224      
Discount (1,166) (1,205) $ (1,304)  
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 8,020 7,915 7,965 $ 7,996
Reinsurance and Other Recoverables (254) (245) (245) (237)
Unpaid losses and loss adjustment expenses 8,274 $ 8,160 $ 8,210 $ 8,233
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 14,262      
Cumulative Paid for Accident Years Displayed in Triangles (8,187)      
Unpaid for Accident Years not Displayed in Triangles 1,434      
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 200      
Discount (1,089)      
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 6,620      
Reinsurance and Other Recoverables (243)      
Unpaid losses and loss adjustment expenses 6,863      
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 6,525      
Cumulative Paid for Accident Years Displayed in Triangles (5,934)      
Unpaid for Accident Years not Displayed in Triangles 157      
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 5      
Discount (14)      
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 739      
Reinsurance and Other Recoverables (5)      
Unpaid losses and loss adjustment expenses 744      
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 148      
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 9      
Discount 0      
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 157      
Reinsurance and Other Recoverables 0      
Unpaid losses and loss adjustment expenses 157      
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 523      
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance 10      
Discount (63)      
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 470      
Reinsurance and Other Recoverables (2)      
Unpaid losses and loss adjustment expenses 472      
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 0      
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 34      
Reinsurance and Other Recoverables (4)      
Unpaid losses and loss adjustment expenses $ 38