Despite The Donald, it appears that the GOP will easily hold on to the House.
And the Senate race is as close as can be ...
As of this minute the Senate is leaning red 51-49.
The House looks to be safely in red territory. 218 seats are needed for a majority, and the GOP seems to have 207 already in the bag, with their final number currently expected to be between 231 and 242.
If the Republicans had come up with a sensible candidate for the presidency, they would be looking at full control of the government for at least two years, and just about certain confirmation of Supreme Court nominations, assuming (at least) 50 Senate seats and a Republican VP to break the tie if necessary. (The full Senate has not rejected a nominee in 29 years. The last was Bork in 1987.)
Assuming Trump will not win, American can expect four more years of gridlocked partisan struggles between the legislative and the executive branches.