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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Nov. 02, 2017
Significant Accounting Policies [Line Items] |  |  |  |  |
Health services term |  | 1 year |  |  |
Number of days notice for employer group to cancel short-duration prepaid health services policies |  | 30 days |  |  |
Consumer discounts on brand name prescription drugs |  | 50.00% |  |  |
Pharmaceutical rebates |  | $ 2,000,000,000 | $ 2,000,000,000 |  |
Typical term (in years) of short-duration employer-group prepaid health services policies |  | 1 year |  |  |
Goodwill |  | $ 9,142,000,000 | 11,092,000,000 | $ 4,447,000,000 |
Goodwill impairment loss |  | 0 | 0 | 0 |
Value Creation Initiatives |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Restructuring and impairment charge |  | 473,000,000 |  |  |
Assets held for abandonment |  | 248,000,000 |  |  |
Severance costs |  | 116,000,000 |  |  |
Home Solutions Reporting Unit |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Goodwill |  | 4,300,000,000 |  |  |
Provider reporting unit |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Goodwill |  | $ 1,100,000,000 |  |  |
Equipment | Minimum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Long-lived assets estimated useful life (in years) |  | 3 years |  |  |
Equipment | Maximum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Long-lived assets estimated useful life (in years) |  | 10 years |  |  |
Computer software | Minimum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Long-lived assets estimated useful life (in years) |  | 3 years |  |  |
Computer software | Maximum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Long-lived assets estimated useful life (in years) |  | 5 years |  |  |
Building | Minimum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Long-lived assets estimated useful life (in years) |  | 10 years |  |  |
Building | Maximum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Long-lived assets estimated useful life (in years) |  | 20 years |  |  |
Services |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Accounts receivable |  | $ 291,000,000 | $ 475,000,000 |  |
Medicare Supplement Product | Revenue Benchmark | Product Concentration Risk |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration risk (percent) |  | 1.00% |  |  |
Reinsurance Policy, Type [Axis]: CMS brand name prescription drug discounts | Minimum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Settlement period after close |  | 14 months |  |  |
Reinsurance Policy, Type [Axis]: CMS brand name prescription drug discounts | Maximum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Settlement period after close |  | 18 months |  |  |
Reinsurance Policy, Type [Axis]: CMS reinsurance subsidies and discounts |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Settlement period after close |  | 9 months |  |  |
US Risk Corridor Premium Stabilization Program |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Litigation recoveries sought |  |  |  |  | $ 611,000,000
Payment received upon judgement | $ 609,000,000 |  |  | 609,000,000 |
Related legal fees and expenses |  |  |  | 31,000,000 |
Health Care Reform |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Payment of annual health insurance industry fee |  |  |  | $ 1,180,000,000 |

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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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