Another point of context, the US spent $2.4T on the Iraq+Afghanistan wars.
Invading Kuwait over $14B debt is a strange leap, since Iraq could far less expensively simply default. Anyway, it's the wrong direction -- $14B debt to Kuwait would make Kuwait less interested in invading Iraq for risk of forcing default. But either way, the value of the oil spoils (in either direction) dwarfs the cost of the debt.
Invading Kuwait over $14B debt is a strange leap, since Iraq could far less expensively simply default. Anyway, it's the wrong direction -- $14B debt to Kuwait would make Kuwait less interested in invading Iraq for risk of forcing default. But either way, the value of the oil spoils (in either direction) dwarfs the cost of the debt.