diff -r ad92e63de42c Lib/inspect.py
--- a/Lib/inspect.py	Thu Feb 20 23:26:12 2014 +0100
+++ b/Lib/inspect.py	Thu Feb 20 16:18:46 2014 -0800
@@ -88,8 +88,11 @@
     Instance method objects provide these attributes:
         __doc__         documentation string
         __name__        name with which this method was defined
-        __func__        function object containing implementation of method
-        __self__        instance to which this method is bound"""
+        __self__        instance to which this method is bound
+    Non-builtin instance method objects also provide this attribute:
+        __func__        function object containing implementation of method"""
+    if isbuiltin(object):
+        return bool(getattr(object, '__self__', False))
     return isinstance(object, types.MethodType)
 
 def ismethoddescriptor(object):
diff -r ad92e63de42c Lib/pydoc.py
--- a/Lib/pydoc.py	Thu Feb 20 23:26:12 2014 +0100
+++ b/Lib/pydoc.py	Thu Feb 20 16:18:46 2014 -0800
@@ -909,7 +909,6 @@
                         object.__self__.__class__, mod)
                 else:
                     note = ' unbound %s method' % self.classlink(imclass,mod)
-            object = object.__func__
 
         if name == realname:
             title = '<a name="%s"><strong>%s</strong></a>' % (anchor, realname)
@@ -924,7 +923,7 @@
             title = '<a name="%s"><strong>%s</strong></a> = %s' % (
                 anchor, name, reallink)
         argspec = None
-        if inspect.isfunction(object) or inspect.isbuiltin(object):
+        if inspect.isroutine(object):
             try:
                 signature = inspect.signature(object)
             except (ValueError, TypeError):
@@ -1315,7 +1314,6 @@
                         object.__self__.__class__, mod)
                 else:
                     note = ' unbound %s method' % classname(imclass,mod)
-            object = object.__func__
 
         if name == realname:
             title = self.bold(realname)
diff -r ad92e63de42c Lib/test/test_pydoc.py
--- a/Lib/test/test_pydoc.py	Thu Feb 20 23:26:12 2014 +0100
+++ b/Lib/test/test_pydoc.py	Thu Feb 20 16:18:46 2014 -0800
@@ -704,7 +704,7 @@
         # test producing signatures from builtins
         stat_sig = pydoc.render_doc(os.stat)
         self.assertEqual(pydoc.plain(stat_sig).splitlines()[2],
-            'stat(path, *, dir_fd=None, follow_symlinks=True)')
+            'stat(path, *, dir_fd=None, follow_symlinks=True) method of builtins.module instance')
 
 
 @unittest.skipUnless(threading, 'Threading required for this test.')