There is a lot of discussion regarding US requests of other NATO members paying "their fair share" and having "debts" towards NATO where it seems mostly vague what exactly the US, or concretely the US president, thinks why and what other members owe anything. To focus on something concrete:
This article https://www.thesun.co.uk/news/6745786/nato-contributions-country-who-pay-most-least-2-percent-gdp-target-trump/ claims "The United States contributes the most to the alliance, funding around 70 per cent of Nato spending."
Is there a bill/listing of NATO spending and who pays how much for the resulting costs? And is the US paying 70% for such NATO incurred costs?
To me it seems possible that the the article is merely quoting the sum of defence spending and considers that as "NATO funding". Would that be valid? The existence of such an official "spending" list would be interesting even if the answer regarding the article is that this line refers to the overall defence spending.