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Insurance and Contractholder Liabilities - Contractholder Deposit Funds (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Insurance and Contractholder Liabilities [Line Items]      
Contractholder deposit fund liabilities, approximate percent reinsured externally 39.00%    
Cigna Healthcare      
Insurance and Contractholder Liabilities [Line Items]      
Contractholder deposit funds   $ 171  
Other Operations      
Insurance and Contractholder Liabilities [Line Items]      
Contractholder deposit funds $ 6,540 $ 6,709 $ 6,900
Weighted average crediting rate 3.31% 3.08%  
Net amount at risk $ 3,000 $ 3,000  
Cash surrender value $ 2,800 $ 2,400  
Other Operations | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 To 0400      
Insurance and Contractholder Liabilities [Line Items]      
Contractholder deposit funds not reinsured externally, percent with guaranteed interest rates of 0300 to 0400 99.00% 99.00%  
Contractholder deposit funds not reinsured externally $ 4,000 $ 4,100  
Other Operations | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 To 0400 | Policyholder Account Balance, at Guaranteed Minimum Crediting Rate      
Insurance and Contractholder Liabilities [Line Items]      
Contractholder deposit funds not reinsured externally 1,200 1,200  
Other Operations | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 To 0400 | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150      
Insurance and Contractholder Liabilities [Line Items]      
Contractholder deposit funds not reinsured externally 1,200 1,200  
Other Operations | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 To 0400 | Policyholder Account Balance, Above Guaranteed Minimum Crediting Rate, Based On Greater Of Guaranteed Minimum Cash Value Or Actual Cash Value      
Insurance and Contractholder Liabilities [Line Items]      
Contractholder deposit funds not reinsured externally $ 1,600 $ 1,700  
Percentage with cash values at more than 110% of guaranteed cash value 90.00% 90.00%  
Other Operations | Minimum | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150      
Insurance and Contractholder Liabilities [Line Items]      
Above guaranteed minimum crediting rate 0.0050 0.0050  
Other Operations | Minimum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 To 0400      
Insurance and Contractholder Liabilities [Line Items]      
Guaranteed minimum credit rating 3.00% 3.00%  
Other Operations | Maximum | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150      
Insurance and Contractholder Liabilities [Line Items]      
Above guaranteed minimum crediting rate 0.0150 0.0150  
Other Operations | Maximum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 To 0400      
Insurance and Contractholder Liabilities [Line Items]      
Guaranteed minimum credit rating 4.00% 4.00%