Not sure if DTW/NRT is still effected by runway construction. Are you flying S3C and companion or buddy pass (S4)?

I'd be more concerned about getting back. You may need to utilize Osaka (KIX) or Haneda, Tokyo (HND). Don't forget SEA, SFO, LAX, PDX, MSP, JFK and of course ATL--so many gateway cities. Welcome to DL and this IS the place to be for nonrev info and nice folks.