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MEDICARE PART D (Tables)
 6 Months Ended
Jun. 30, 2021
Insurance [Abstract]  
Schedule of Balance Sheet Amounts Associated With Medicare Part D The accompanying condensed consolidated balance sheets include the following amounts associated with Medicare Part D at June 30, 2021 and December 31, 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.
 June 30, 2021December 31, 2020
Risk
Corridor
Settlement		CMS
Subsidies/
Discounts		Risk
Corridor
Settlement		CMS
Subsidies/
Discounts
 (in millions)
Other current assets$169 $1,635 $216 $1,420 
Trade accounts payable and accrued expenses(13)(1,653)(39)(253)
Net current asset (liability)156 (18)177 1,167 
Other long-term assets317 — 8 — 
Other long-term liabilities(198)— (90)— 
Net long-term asset (liability)119 — (82)— 
Total net asset (liability)$275 $(18)$95 $1,167