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Medical Costs Payable (Notes)
 12 Months Ended
Dec. 31, 2024
Insurance [Abstract]  
Medical Costs Payable Medical Costs Payable
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 
For the years ended December 31, 2024, 2023 and 2022, prior years’ medical cost reserve development included no individual factors that were significant. Medical costs payable included IBNR of $23.7 billion and $22.3 billion at December 31, 2024 and 2023, respectively. Substantially all of the IBNR balance as of December 31, 2024 relates to the current year.
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