diff --git a/src/_pytest/fixtures.py b/src/_pytest/fixtures.py
index 8fd56f8ac..b24fc5fd3 100644
--- a/src/_pytest/fixtures.py
+++ b/src/_pytest/fixtures.py
@@ -976,7 +976,7 @@ class FixtureDef(Generic[_FixtureValue]):
         ids: Optional[
             Union[
                 Tuple[Union[None, str, float, int, bool], ...],
-                Callable[[object], Optional[object]],
+                Callable[[Any], Optional[object]],
             ]
         ] = None,
     ) -> None:
@@ -1128,13 +1128,13 @@ def _ensure_immutable_ids(
     ids: Optional[
         Union[
             Iterable[Union[None, str, float, int, bool]],
-            Callable[[object], Optional[object]],
+            Callable[[Any], Optional[object]],
         ]
     ],
 ) -> Optional[
     Union[
         Tuple[Union[None, str, float, int, bool], ...],
-        Callable[[object], Optional[object]],
+        Callable[[Any], Optional[object]],
     ]
 ]:
     if ids is None:
@@ -1180,7 +1180,7 @@ class FixtureFunctionMarker:
     ids = attr.ib(
         type=Union[
             Tuple[Union[None, str, float, int, bool], ...],
-            Callable[[object], Optional[object]],
+            Callable[[Any], Optional[object]],
         ],
         default=None,
         converter=_ensure_immutable_ids,
@@ -1223,7 +1223,7 @@ def fixture(
     ids: Optional[
         Union[
             Iterable[Union[None, str, float, int, bool]],
-            Callable[[object], Optional[object]],
+            Callable[[Any], Optional[object]],
         ]
     ] = ...,
     name: Optional[str] = ...
@@ -1241,7 +1241,7 @@ def fixture(  # noqa: F811
     ids: Optional[
         Union[
             Iterable[Union[None, str, float, int, bool]],
-            Callable[[object], Optional[object]],
+            Callable[[Any], Optional[object]],
         ]
     ] = ...,
     name: Optional[str] = None
@@ -1258,7 +1258,7 @@ def fixture(  # noqa: F811
     ids: Optional[
         Union[
             Iterable[Union[None, str, float, int, bool]],
-            Callable[[object], Optional[object]],
+            Callable[[Any], Optional[object]],
         ]
     ] = None,
     name: Optional[str] = None
diff --git a/src/_pytest/mark/structures.py b/src/_pytest/mark/structures.py
index c55e04755..5edeecdd5 100644
--- a/src/_pytest/mark/structures.py
+++ b/src/_pytest/mark/structures.py
@@ -433,7 +433,7 @@ if TYPE_CHECKING:
             ids: Optional[
                 Union[
                     Iterable[Union[None, str, float, int, bool]],
-                    Callable[[object], Optional[object]],
+                    Callable[[Any], Optional[object]],
                 ]
             ] = ...,
             scope: Optional[_Scope] = ...
diff --git a/src/_pytest/python.py b/src/_pytest/python.py
index 7209bf1ed..aa8171486 100644
--- a/src/_pytest/python.py
+++ b/src/_pytest/python.py
@@ -11,6 +11,7 @@ from collections import Counter
 from collections import defaultdict
 from collections.abc import Sequence
 from functools import partial
+from typing import Any
 from typing import Callable
 from typing import Dict
 from typing import Generator
@@ -920,7 +921,7 @@ class Metafunc:
         ids: Optional[
             Union[
                 Iterable[Union[None, str, float, int, bool]],
-                Callable[[object], Optional[object]],
+                Callable[[Any], Optional[object]],
             ]
         ] = None,
         scope: "Optional[_Scope]" = None,
@@ -1040,7 +1041,7 @@ class Metafunc:
         ids: Optional[
             Union[
                 Iterable[Union[None, str, float, int, bool]],
-                Callable[[object], Optional[object]],
+                Callable[[Any], Optional[object]],
             ]
         ],
         parameters: typing.Sequence[ParameterSet],
@@ -1226,7 +1227,7 @@ def _idval(
     val: object,
     argname: str,
     idx: int,
-    idfn: Optional[Callable[[object], Optional[object]]],
+    idfn: Optional[Callable[[Any], Optional[object]]],
     nodeid: Optional[str],
     config: Optional[Config],
 ) -> str:
@@ -1266,7 +1267,7 @@ def _idvalset(
     idx: int,
     parameterset: ParameterSet,
     argnames: Iterable[str],
-    idfn: Optional[Callable[[object], Optional[object]]],
+    idfn: Optional[Callable[[Any], Optional[object]]],
     ids: Optional[List[Union[None, str]]],
     nodeid: Optional[str],
     config: Optional[Config],
@@ -1287,7 +1288,7 @@ def _idvalset(
 def idmaker(
     argnames: Iterable[str],
     parametersets: Iterable[ParameterSet],
-    idfn: Optional[Callable[[object], Optional[object]]] = None,
+    idfn: Optional[Callable[[Any], Optional[object]]] = None,
     ids: Optional[List[Union[None, str]]] = None,
     config: Optional[Config] = None,
     nodeid: Optional[str] = None,
diff --git a/testing/typing_checks.py b/testing/typing_checks.py
index 94c66ef51..0a6b5ad28 100644
--- a/testing/typing_checks.py
+++ b/testing/typing_checks.py
@@ -10,3 +10,15 @@ import pytest
 @pytest.mark.xfail(raises=RuntimeError)
 def check_mark_xfail_raises() -> None:
     pass
+
+
+# Issue #7494.
+@pytest.fixture(params=[(0, 0), (1, 1)], ids=lambda x: str(x[0]))
+def check_fixture_ids_callable() -> None:
+    pass
+
+
+# Issue #7494.
+@pytest.mark.parametrize("func", [str, int], ids=lambda x: str(x.__name__))
+def check_parametrize_ids_callable(func) -> None:
+    pass