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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2025
Accounting Policies [Abstract] |
Schedule of Property Software and Equipment Depreciation Periods | Property, software and equipment are depreciated over the following periods:
Fixed Asset |  | Depreciation 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 Asset |  | Amortization Period
Purchased contract rights and customer relationships |  | 5 - 15 years
Provider contracts |  | 4 - 15 years
Trade names |  | 7 - 20 years
Developed technologies |  | 2 - 5 years
Schedule of Allowance for Uncollectible Accounts | Activity in the allowance for uncollectible accounts is summarized below ($ in millions):
| Year Ended December 31,
| 2025 |  | 2024 |  | 2023
Balance, January 1 | $ | 111 |  |  | $ | 120 |  |  | $ | 130 |
Amounts charged to expense | 99 |  |  | 68 |  |  | 58 |
Recoveries | (3) |  |  | — |  |  | — |
Write-offs of uncollectible receivables | (73) |  |  | (77) |  |  | (68) |
Balance, December 31 | $ | 134 |  |  | $ | 111 |  |  | $ | 120 |

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