Drop simple id completion, more thorough one is in completions/coreutils.

bash_completion

@@ -1523,7 +1523,7 @@ for i in a2ps autoconf automake bc gprof ld nm objcopy objdump readelf strip \
     touch vdir awk gperf grep grub indent less m4 sed shar date \
     tee who texindex cat csplit cut expand fmt fold head \
     md5sum nl od paste pr ptx sha1sum sort split tac tail tr unexpand \
-    uniq wc ldd bash id irb mkdir rmdir wget curl; do
+    uniq wc ldd bash irb mkdir rmdir wget curl; do
     have $i && complete -F _longopt -o filenames $i
 done