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MEDICARE PART D
 9 Months Ended
Sep. 30, 2021
Insurance [Abstract]  
MEDICARE PART D MEDICARE PART D
We cover prescription drug benefits in accordance with Medicare Part D under multiple contracts with the Centers for Medicare and Medicaid Services, or CMS, as described further in Note 2 to the consolidated financial statements included in our 2020 Form 10-K. The accompanying condensed consolidated balance sheets include the following amounts associated with Medicare Part D at September 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.
 September 30, 2021December 31, 2020
Risk
Corridor
Settlement		CMS
Subsidies/
Discounts		Risk
Corridor
Settlement		CMS
Subsidies/
Discounts
 (in millions)
Other current assets$170 $1,681 $216 $1,420 
Trade accounts payable and accrued expenses(14)(1,139)(39)(253)
Net current asset156 542 177 1,167 
Other long-term assets244 — 8 — 
Other long-term liabilities(257)— (90)— 
Net long-term liability(13)— (82)— 
Total net asset$143 $542 $95 $1,167