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MEDICARE PART D (Tables)
 12 Months Ended
Dec. 31, 2021
Insurance [Abstract]  
Schedule of Balance Sheet Amounts Associated With Medicare Part D The accompanying consolidated balance sheets include the following amounts associated with Medicare Part D as of December 31, 2021 and 2020. CMS subsidies/discounts in the table below include the reinsurance and low-income cost subsidies funded by CMS for which we assume no risk as well as brand name prescription drug discounts for Part D plan participants in the coverage gap funded by CMS and pharmaceutical manufacturers.
 20212020
 Risk
Corridor
Settlement		CMS
Subsidies/
Discounts		Risk
Corridor
Settlement		CMS
Subsidies/
Discounts
 (in millions)
Other current assets$363 $1,894 $216 $1,420 
Trade accounts payable and accrued expenses(68)(466)(39)(253)
Net current asset295 1,428 177 1,167 
Other long-term assets5 — 8 — 
Other long-term liabilities(194)— (90)— 
Net long-term liability(189)— (82)— 
       Total net asset$106 $1,428 $95 $1,167