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MEDICARE PART D
 6 Months Ended
Jun. 30, 2020
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 2019 Form 10-K. The accompanying condensed consolidated balance sheets include the following amounts associated with Medicare Part D at June 30, 2020 and December 31, 2019. 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, 2020December 31, 2019
Risk
Corridor
Settlement		CMS
Subsidies/
Discounts		Risk
Corridor
Settlement		CMS
Subsidies/
Discounts
 (in millions)
Other current assets$26  $1,010  $5  $585  
Trade accounts payable and accrued expenses(100) (1,193) (120) (356) 
Net current (liability) asset(74) (183) (115) 229  
Other long-term assets313  —  6  —  
Other long-term liabilities(149) —  (61) —  
Net long-term asset (liability)164  —  (55) —  
Total net asset (liability)$90  $(183) $(170) $229