According to One Earth, cumulative (1988-2022) reparations owed by the top 5 oil companies for GHG climate damage are: 
Saudi Aramco: $1,110 billion 
ExxonMobil: $478 billion 
Shell: $424 billion 
BP: $377 billion 
Chevron: $333 billion 
Total: $2,722 billion (or $2.722 trillion)