Fr. 1000 equates to $1,235 (and yes, there’s a single bill worth that) along with the second highest being Fr. 200 ($247) since the cap in USD maxes out at $100 (Fr. 81) in the US today. There were once $500, $1000, $5000 & $10,000 bills printed in 1928 but ceased reappearing since 1934, only sole collectors have them but they don’t use it for transactions (the $100,000 bill depicting Woodrow Wilson is obscure and not possible to obtain).
spoiler
And yes, this bill is currently in circulation around Switzerland.
What would it be like if suddenly a $1000 bill reemerges from its older design from the 1930s tweaked with modern security features inspired by the Fr. 1000 bill stronger than ones present in the $100 bill? That’s up the Federal Reserve to decide, there’s issues dealing with counterfeit $100 bills, in which the Swiss managed to prevent by making their Fr. 1000 bill difficult as hell to counterfeit. (It’s hard enough to find one the first place).
I did get the 100 notes several times and once even 200 at an ATM and I was super annoyed by that. Usually, if I withdraw larger amounts, I explicitly choose odd numbers to minimize the risk (i.e. 190 instead of 200).