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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2024
Accounting Policies [Abstract]  
Schedule of Property Software and Equipment Depreciation Periods Property, software and equipment are depreciated over the following periods:
Fixed AssetDepreciation Period
Buildings and improvements
 10 - 40 years
Computer hardware and software
3 - 5 years
Furniture and equipment
 5 - 10 years
Land improvements
 10 - 25 years
Leasehold improvements
 1 - 20 years
Schedule of Amortization Period for Intangible Assets Intangible assets are amortized using the straight-line method over the following periods:
Intangible AssetAmortization Period
Purchased contract rights and customer relationships
3 - 21 years
Provider contracts
4 - 15 years
Trade names
7 - 20 years
Developed technologies
2 - 7 years
Schedule of Allowance for Uncollectible Accounts

Activity in the allowance for uncollectible accounts is summarized below ($ in millions):
Year Ended December 31,
 202420232022
Balance, January 1$120 $130 $139 
Amounts charged to expense68 58 70 
Write-offs of uncollectible receivables(77)(68)(79)
Balance, December 31$111 $120 $130