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Medical Costs Payable (Tables)
 12 Months Ended
Dec. 31, 2024
Insurance [Abstract]  
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block]
The following table shows the components of the change in medical costs payable for the years ended December 31:
(in millions)202420232022
Medical costs payable, beginning of period$32,395 $29,056 $24,483 
Acquisitions (dispositions), net(755)1 308 
Reported medical costs:
Current year264,885 242,734 211,252 
Prior years(700)(840)(410)
Total reported medical costs264,185 241,894 210,842 
Medical payments:
Payments for current year
(231,890)(211,380)(184,049)
Payments for prior years(29,532)(27,176)(22,528)
Total medical payments(261,422)(238,556)(206,577)
Less: medical costs payable included within businesses held for sale(179)— — 
Medical costs payable, end of period$34,224 $32,395 $29,056 
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Table Text Block]
The following is information about incurred and paid medical cost development as of December 31, 2024:
Net Incurred Medical Costs
 (in millions)For the Years Ended December 31,
Year20232024
2023$242,734 $242,156 
2024264,885 
Total$507,041 
Net Cumulative Medical Payments
 (in millions)For the Years Ended December 31,
Year20232024
2023$(211,380)$(240,112)
2024(231,890)
Total(472,002)
Net remaining outstanding liabilities prior to 2023119 
Acquisitions (dispositions), net(755)
Medical costs payable included within businesses held for sale(179)
Total medical costs payable$34,224