How to list employment when seconded from one employer to another

How do you annotate your employment when you are seconded to another company? I currently work overseas for a foreign company but I am also seconded to a US company based in the same overseas location because they hold the legal agreement between my company and the US government that legally allows me to perform my job. Would I list the foreign company and then in the remarks put the information for the seconded company?

List your Original employer (who hired and pays you) then note the seconded arrangement in comments. Be sure to delineate your job location and its relationship to either.