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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Oct. 31, 2024
Significant Accounting Policies [Line Items] |  |  |  |
Impairment of indefinite-lived intangible assets | $ 200,000,000 | $ 55,000,000 | $ 0 |
Asset impairment charges |  | 91,000,000 | 0 |
Minimum collateral as percentage of fair value of investment securities | 102.00% |  |  |
Health services term (in years) | 1 year |  |  |
Number of days notice for employer group to cancel short-duration prepaid health services policies (in days) | 30 days |  |  |
Consumer discounts on brand name and generic prescription drugs (as percent) | 75.00% |  |  |
Balance of pharmaceutical rebates | $ 1,700,000,000 | 2,300,000,000 |  |
Uncommitted receivables purchase facility, total capacity |  |  |  | $ 1,190,000,000
Uncommitted receivables purchase facility, total capacity, initial term (in years) |  |  |  | 1 year
Uncommitted receivables purchase facility, cash proceeds received for assets derecognized | 639,000,000 |  |  |
Uncommitted receivables purchase facility, amount collected from manufacturers | 168,000,000 |  |  |
Uncommitted receivables purchase facility, amount collected but not remitted | $ 123,000,000 |  |  |
Typical term of short-duration employer-group prepaid health services policies (in years) | 1 year |  |  |
Goodwill | $ 9,631,000,000 | 9,550,000,000 | 9,142,000,000 |
Goodwill impairment loss | 0 | 0 | 0 |
Certificates of need |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Indefinite-lived intangible assets | $ 910,000,000 | 1,092,000,000 |  |
Reinsurance Policy, Type [Axis]: CMS reinsurance subsidies and discounts |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Settlement period after close (in months) | 9 months |  |  |
Home Solutions Reporting Unit |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Goodwill | $ 4,400,000,000 |  |  |
Services |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Accounts receivable | $ 360,000,000 | 357,000,000 |  |
Minimum | Reinsurance Policy, Type [Axis]: CMS brand name prescription drug discounts |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Settlement period after close (in months) | 14 months |  |  |
Minimum | Equipment |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Long-lived assets estimated useful life (in years) | 3 years |  |  |
Minimum | Computer Software |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Long-lived assets estimated useful life (in years) | 3 years |  |  |
Minimum | Building |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Long-lived assets estimated useful life (in years) | 10 years |  |  |
Maximum | Reinsurance Policy, Type [Axis]: CMS brand name prescription drug discounts |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Settlement period after close (in months) | 18 months |  |  |
Maximum | Equipment |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Long-lived assets estimated useful life (in years) | 10 years |  |  |
Maximum | Computer Software |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Long-lived assets estimated useful life (in years) | 5 years |  |  |
Maximum | Building |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Long-lived assets estimated useful life (in years) | 20 years |  |  |
Value Creation Initiatives |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Restructuring and impairment charge | $ 281,000,000 | 436,000,000 | 473,000,000 |
Assets held for abandonment | 256,000,000 | 237,000,000 | 248,000,000 |
Severance costs | $ 25,000,000 | 199,000,000 | $ 116,000,000 |
Exit From Employer Group Commercial Medical Products Business |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Severance costs |  | $ 70,000,000 |  |

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- Definition Beginning in 2011, the Health Reform Legislation mandates consumer discounts of 50% on brand name prescription drugs for Part D plan participants in the coverage gap. These discounts are funded by CMS and pharmaceutical manufacturers while we administer the application of these funds. + References No definition available. + Details
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