The US majors pay in the area of $24000USD/month.
The amount of lift. the amount of revenue a wide body aircraft generates on a monthly basis justifies this type of salary, everywhere.
The US carriers do not pay a single US penny more than what they think the pilots are worth. In fact, the pilots are worth more, but the number above is what the carriers could live with.
US carriers can only hire US pilots. If (like ME3) they could hire worldwide, and offer (say) South Africans, Indians etc. a work permit in the the US, I don't think they would pay as much.