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Insurance and Contractholder Liabilities - Unpaid Claims and Claim Expenses - Cigna Healthcare - Activity (Details) - Cigna Healthcare - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Beginning balance $ 4,261 $ 3,695
Less: Reinsurance and other amounts recoverable 261 237
Beginning balance, net 4,000 3,458
Incurred costs related to:    
Current year 23,431 23,531
Prior years (278) (217)
Total incurred 23,153 23,314
Paid costs related to:    
Current year 19,655 19,737
Prior years 3,450 2,986
Total paid 23,105 22,723
Ending balance, net 4,048 4,049
Add: Reinsurance and other amounts recoverable 202 276
Ending balance $ 4,250 $ 4,325