The source-based detail drawing consists of only 2D lines/fills, including the 2D exploded representations of all construction elements inside the detail boundary. By default, only construction elements are transferred; annotations and dimensions are not transferred to the Detail viewpoint. (You can change this setting using a checkbox in the General Panel of Detail Settings.)
For information on what happens to annotation elements cut by the Detail boundary, see Annotations, Dimensions and Markers Cut by the Boundary.
Only 2D tools are available in the Detail window. All types of 2D information can be added to the Detail Drawing: Lines, Fills, Hotspots, Text, Figures, Dimensions and 2D Symbols of Objects.
The Detail Drawing will include a line representing the Detail Boundary you drew on the plan.
Section Details (Detail viewpoints created from a Section) reveal the elevation of the original construction, which means that Elevation Dimensioning placed on Detail viewpoints shows correct elevation values, unless you displace drawing elements vertically. (The same is true for Elevation Dimensions in Details generated from Elevations and Interior Elevations.)