The Coronavirus Aid, Relief, and Economic Security Act (CARES) Act of 2020 (H.R. 748) was by far the most gargantuan emergency economic stimulus package ever passed by Congress.
The American Recovery and Reinvestment Act of 2009, addressing the 2008 Financial Crisis and the ensuing Great Recession, was "only" $787 billion at the time of passage.
(That number later crept up-- as Washington outlays are wont to do-- to $831 billion.)