Tuesday's live finale of the singing competition averaged a 2.0 rating in the key demo and grabbed 10.8 million viewers. While it was still enough to make it the highest-rated and most-watched show of the night, it still suffered a major setback. The finale was down in both measurements compared to last fall's season finale, dipping nearly 20 percent.
Prior to the finale, NBC aired a special recap of the season, which drew in 7.9 million viewers and a 1.4 rating.
Elsewhere on TV, Christmas specials filled programming.
On ABC, Olaf's Frozen Adventure drew in a crowd of 4.3 million viewers and a 1.0 rating. Prep & Landing: Naughty vs. Nice (3.4 mil/0.9) and The Year: 2017 (3.8 mil/0.8) had decent measurements.
CBS' special A Home for the Holidays With Josh Groban drew in 5.1 million viewers and a 0.6 rating in the demo.
Over on Fox, Ice Age: A Mammoth Christmas grabbed a 0.4 and 1.3 million viewers.
The CW's special Big Game drew a 0.2 and 1 million viewers.