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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Part D Subsidy/Discount Payments, Net (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Accounting Policies [Abstract] |  |  |
Part D subsidy/discount payments | $ (16,530) | $ (14,889) | $ (13,348)
Part D subsidy/discount reimbursements | 18,498 | 14,628 | 12,410
Net reimbursements (payments) | $ 1,968 | $ (261) | $ (938)

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- Definition Subsidy And Discount Reimbursements + References No definition available. + Details
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