In 2002 dollars, multi-decade estimates range from $1.8 - $3 trillion. Official numbers place it between $115 - $123 billion.
Most often, whatever Israel wants it gets. US taxpayers pay the tab. They have no idea how much it costs. In 2009, Israeli military spending accounted for "an additional 15.1% of (its) overall budget."
As a percent of GDP, it's "the biggest defense spender." It's for offense, not defense. Israel has no regional enemies. It invents them to hype fear.
Washington does the same thing. They're rogue partners in crime.
US-supplied aid funds regional instability, settlements, and other forms of occupation harshness. It also made Israel a "laboratory to develop weapons, surveillance technology, and" control populations.
Israel markets what it has globally. It exports death, destruction and human misery. It sells to allies and alleged enemies.
Its customers include Islamist, communist, capitalist, despotic, and nominally democratic states. Where there's profit to be made, Israel seeks it.
Where there's a way to further Israel's imperium and ally with likeminded partners, Israel prioritizes it.