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Reserve for Unpaid Losses and Loss Adjustment Expenses - Historical Loss Development Triangles, Group (Details) - Group Benefits
$ in Millions
Dec. 31, 2024
USD ($)
claim
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles $ 20,578                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 13,912                  
Group long-term disability                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 14,365                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 8,243                  
Group life and accident, excluding premium waiver                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 6,213                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 5,669                  
2015 | Group long-term disability                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 1,385 $ 1,380 $ 1,380 $ 1,380 $ 1,385 $ 1,401 $ 1,420 $ 1,422 $ 1,442 $ 1,595
IBNR Reserves $ 0                  
Claims Reported | claim 32,589                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,164 1,125 1,078 1,025 962 891 806 687 460 $ 108
2016 | Group long-term disability                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 1,407 1,400 1,401 1,409 1,417 1,437 1,468 1,481 1,651  
IBNR Reserves $ 0                  
Claims Reported | claim 33,307                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,144 1,100 1,043 981 907 819 705 479 $ 112  
2017 | Group long-term disability                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 1,294 1,289 1,296 1,304 1,316 1,358 1,413 1,597    
IBNR Reserves $ 0                  
Claims Reported | claim 30,929                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,017 970 911 842 757 658 452 $ 109    
2018 | Group long-term disability                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 1,279 1,271 1,276 1,277 1,309 1,387 1,647      
IBNR Reserves $ 0                  
Claims Reported | claim 28,428                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 954 897 827 743 639 447 $ 105      
2019 | Group long-term disability                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 1,277 1,287 1,284 1,327 1,424 1,650        
IBNR Reserves $ 0                  
Claims Reported | claim 27,467                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 895 832 751 650 454 $ 101        
2020 | Group long-term disability                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 1,260 1,282 1,323 1,407 1,686          
IBNR Reserves $ 0                  
Claims Reported | claim 25,862                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 839 767 663 458 $ 100          
Short-Duration Insurance Contract, Accident Year 2021 [Member] | Group long-term disability                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 1,351 1,417 1,521 1,768            
IBNR Reserves $ 1                  
Claims Reported | claim 27,156                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 820 720 493 $ 101            
Short-Duration Insurance Contract, Accident Year 2022 | Group long-term disability                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 1,452 1,566 1,842              
IBNR Reserves $ 6                  
Claims Reported | claim 25,952                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 719 496 101              
Short-Duration Insurance Contract, Accident Year 2022 | Group life and accident, excluding premium waiver                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 2,056 2,053 2,061              
IBNR Reserves $ 12                  
Claims Reported | claim 72,225                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 2,040 2,018 $ 1,562              
Short-Duration Insurance Contract, Accident Year 2023 | Group long-term disability                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 1,700 1,988                
IBNR Reserves $ 44                  
Claims Reported | claim 28,026                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 562 116                
Short-Duration Insurance Contract, Accident Year 2023 | Group life and accident, excluding premium waiver                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 2,092 2,108                
IBNR Reserves $ 25                  
Claims Reported | claim 74,958                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 2,053 $ 1,572                
Short-Duration Insurance Contract, Accident Year 2024 | Group long-term disability                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 1,960                  
IBNR Reserves $ 970                  
Claims Reported | claim 18,035                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 129                  
Short-Duration Insurance Contract, Accident Year 2024 | Group life and accident, excluding premium waiver                    
Claims Development [Line Items]                    
Cumulative Incurred for Accident Years Displayed in Triangles 2,065                  
IBNR Reserves $ 380                  
Claims Reported | claim 59,084                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,576