v3.24.1.u1
Insurance and Contractholder Liabilities - Future Policy Benefits - Present Value of Expected Premiums and Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Held-for-Sale | Medicare Advantage and related Cigna Healthcare businesses        
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Future policy benefits classified as liabilities of business held for sale     $ 429  
Cigna Healthcare        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Beginning balance $ 9,233 $ 8,557    
Reversal of effect of beginning of period discount rate assumptions 1,154 1,537    
Issuances and lapses 446 306    
Net premiums collected (350) (326)    
Interest and other 73 56    
Ending balance at original discount rate 10,556 10,130    
Effect of end of period discount rate assumptions (1,309) (1,312)    
Ending balance 9,247 8,818 9,233 $ 8,557
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Beginning balance 9,633 8,945    
Reversal of effect of discount rate assumptions 1,220 1,611    
Issuances and lapses 457 307    
Benefit payments (362) (326)    
Interest and other 71 58    
Ending balance at original discount rate 11,019 10,595    
Effect of discount rate assumptions (1,381) (1,378)    
Ending balance 9,638 9,217 9,633 8,945
Liability for future policy benefits 391 399    
Other 216 202    
Total liability for future policy benefits   601    
Total liability for future policy benefits, including assets held for sale 607      
Undiscounted expected future gross premiums 19,000 17,600    
Discounted expected future gross premiums 13,300 12,500    
Undiscounted expected future policy benefits 13,600 12,800    
Future policy benefits reserve, reinsurance recoverables 72 154    
Cigna Healthcare | Held-for-Sale | Medicare Advantage and related Cigna Healthcare businesses        
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Future policy benefits reserve, reinsurance recoverables reported in assets of businesses held for sale 81      
Future policy benefits classified as liabilities of business held for sale 427      
Other Operations        
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Total liability for future policy benefits 3,460 3,631 3,538  
Undiscounted expected future policy benefits 4,400 4,600    
Future policy benefits reserve, reinsurance recoverables 1,000 1,000    
Future policy benefits, DPL 379 392    
Future policy benefit, excluding DPL $ 3,100 $ 3,200 $ 3,200 $ 3,200