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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2022
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
 5 - 40 years
Computer hardware and software
3 - 5 years
Furniture and equipment
 3 - 10 years
Land improvements
 10 - 20 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,
 202220212020
Balance, January 1$139 $243 $157 
Amounts charged to expense70 62 121 
Recoveries— (43)— 
Write-offs of uncollectible receivables(79)(123)(35)
Balance, December 31$130 $139 $243