2. The “Annual fund operating expenses” table and information under the heading “Example” in the “Fees and expenses of the fund” section of the summary and statutory prospectus for AFMF is amended to read as follows. Except as indicated below, footnotes in the prospectus remain unchanged.

Annual fund operating expenses (expenses that you pay each year as a percentage of the net asset value of your investment)
Share class:	A	C	T	F-1	F-2	F-3	529-A
Management fees²	0.22%	0.22%	0.22%	0.22%	0.22%	0.22%	0.22%
Distribution and/or service (12b-1) fees	0.25	1.00	0.25	0.25	none	none	0.22
Other expenses	0.21	0.21	0.21	0.15	0.15	0.04	0.25
Total annual fund operating expenses	0.68	1.43	0.68	0.62	0.37	0.26	0.69

Share class:	529-C	529-E	529-T	529-F-1	529-F-2	529-F-3	R-1
Management fees²	0.22%	0.22%	0.22%	0.22%	0.22%	0.22%	0.22%
Distribution and/or service (12b-1) fees	1.00	0.49	0.25	0.25	none	none	1.00
Other expenses	0.26	0.21	0.25	0.21	0.19	0.09	0.16
Total annual fund operating expenses	1.48	0.92	0.72	0.68	0.41	0.31	1.38

Share class:	R-2	R-2E	R-3	R-4	R-5E	R-5	R-6
Management fees²	0.22%	0.22%	0.22%	0.22%	0.22%	0.22%	0.22%
Distribution and/or service (12b-1) fees	0.75	0.60	0.50	0.25	none	none	none
Other expenses	0.38	0.27	0.20	0.15	0.24	0.10	0.04
Total annual fund operating expenses	1.35	1.09	0.92	0.62	0.46	0.32	0.26
Fee waiver	none	0.01³	none	none	0.04³	none	none
Total annual fund operating expenses after fee waiver	1.35	1.08	0.92	0.62	0.42	0.32	0.26

²

Restated to reflect current fees.

Expense Example Narrative [Text Block]

This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds.

The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the fund’s operating expenses remain the same. The example reflects the fee waiver described above through the expiration date of such waiver and total annual fund operating expenses thereafter. You may be required to pay brokerage commissions on your purchases and sales of Class F-2, F-3, 529-F-2 or 529-F-3 shares of the fund, which are not reflected in the example.

Expense Example, With Redemption [Table]

Share class:	A	C	T	F-1	F-2	F-3	529-A	529-C	529-E	529-T	529-F-1	529-F-2	529-F-3	R-1
1 year	$442	$246	$318	$63	$38	$27	$418	$251	$94	$322	$69	$42	$32	$140
3 years	584	452	462	199	119	84	563	468	293	474	218	132	100	437
5 years	739	782	619	346	208	146	721	808	509	641	379	230	174	755
10 years	1,190	1,509	1,075	774	468	331	1,178	1,265	1,131	1,122	847	518	393	1,657

Share class:	R-2	R-2E	R-3	R-4	R-5E	R-5	R-6	For the share classes listed to the right, you would pay the following if you did not redeem your shares:	Share class:	C	529-C
1 year	$137	$110	$94	$63	$43	$33	$27		1 year	$146	$151
3 years	428	346	293	199	144	103	84		3 years	452	468
5 years	739	600	509	346	254	180	146		5 years	782	808
10 years	1,624	1,328	1,131	774	575	406	331		10 years	1,509	1,265

Expense Example, No Redemption [Table]

Share class:	R-2	R-2E	R-3	R-4	R-5E	R-5	R-6	For the share classes listed to the right, you would pay the following if you did not redeem your shares:	Share class:	C	529-C
1 year	$137	$110	$94	$63	$43	$33	$27		1 year	$146	$151
3 years	428	346	293	199	144	103	84		3 years	452	468
5 years	739	600	509	346	254	180	146		5 years	782	808
10 years	1,624	1,328	1,131	774	575	406	331		10 years	1,509	1,265

Expense Narrative [Text Block]

4. The “Annual fund operating expenses” table and information under the heading “Example” in the “Fees and expenses of the fund” section of the summary and statutory prospectus for IBFA is amended to read as follows. Except as indicated below, footnotes in the prospectus remain unchanged.

Annual Fund Operating Expenses [Table]

Annual fund operating expenses (expenses that you pay each year as a percentage of the net asset value of your investment)
Share class:	A	C	T	F-1	F-2	F-3	529-A
Management fees²	0.21%	0.21%	0.21%	0.21%	0.21%	0.21%	0.21%
Distribution and/or service (12b-1) fees	0.30	1.00	0.25	0.25	none	none	0.23
Other expenses	0.14	0.14	0.14	0.22	0.15	0.04	0.19
Total annual fund operating expenses	0.65	1.35	0.60	0.68	0.36	0.25	0.63

Share class:	529-C	529-E	529-T	529-F-1	529-F-2	529-F-3	R-1
Management fees²	0.21%	0.21%	0.21%	0.21%	0.21%	0.21%	0.21%
Distribution and/or service (12b-1) fees	1.00	0.50	0.25	0.25	none	none	1.00
Other expenses	0.19	0.12	0.19	0.27	0.13	0.09	0.10
Total annual fund operating expenses	1.40	0.83	0.65	0.73	0.34	0.30	1.31

Share class:	R-2	R-2E	R-3	R-4	R-5E	R-5	R-6
Management fees²	0.21%	0.21%	0.21%	0.21%	0.21%	0.21%	0.21%
Distribution and/or service (12b-1) fees	0.75	0.60	0.50	0.25	none	none	none
Other expenses	0.35	0.22	0.18	0.13	0.19	0.09	0.04
Total annual fund operating expenses	1.31	1.03	0.89	0.59	0.40	0.30	0.25

²

Restated to reflect current fees.

Expense Example Narrative [Text Block]

This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds.

The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the fund’s operating expenses remain the same. You may be required to pay brokerage commissions on your purchases and sales of Class F-2, F-3, 529-F-2 or 529-F-3 shares of the fund, which are not reflected in the example.

Expense Example, With Redemption [Table]

Share class:	A	C	T	F-1	F-2	F-3	529-A	529-C	529-E	529-T	529-F-1	529-F-2	529-F-3	R-1
1 year	$315	$237	$310	$69	$37	$26	$313	$243	$85	$315	$75	$35	$31	$133
3 years	453	428	437	218	116	80	447	443	265	453	233	109	97	415
5 years	603	739	576	379	202	141	592	766	460	603	406	191	169	718
10 years	1,040	1,432	981	847	456	318	1,017	1,185	1,025	1,040	906	431	381	1,579

Share class:	R-2	R-2E	R-3	R-4	R-5E	R-5	R-6	For the share classes listed to the right, you would pay the following if you did not redeem your shares:	Share class:	C	529-C
1 year	$133	$105	$91	$60	$41	$31	$26		1 year	$137	$143
3 years	415	328	284	189	128	97	80		3 years	428	443
5 years	718	569	493	329	224	169	141		5 years	739	766
10 years	1,579	1,259	1,096	738	505	381	318		10 years	1,432	1,185

Expense Example, No Redemption [Table]

Share class:	R-2	R-2E	R-3	R-4	R-5E	R-5	R-6	For the share classes listed to the right, you would pay the following if you did not redeem your shares:	Share class:	C	529-C
1 year	$133	$105	$91	$60	$41	$31	$26		1 year	$137	$143
3 years	415	328	284	189	128	97	80		3 years	428	443
5 years	718	569	493	329	224	169	141		5 years	739	766
10 years	1,579	1,259	1,096	738	505	381	318		10 years	1,432	1,185

Expense Narrative [Text Block]

3. The “Annual fund operating expenses” table and information under the heading “Example” in the “Fees and expenses of the fund” section of the summary and statutory prospectus for AHIT is amended to read as follows. Except as indicated below, footnotes in the prospectus remain unchanged.

Operating Expenses Caption [Optional Text]

Annual fund operating expenses (expenses that you pay each year as a percentage of the net asset value of your investment)

Expense Example [Heading]

Example

Expense Example by, Year, Caption [Text]

Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example, No Redemption, By Year, Caption [Text]

For the share classes listed to the right, you would pay the following if you did not redeem your shares:

Expense Example Closing [Text Block]

Keep this supplement with your summary and statutory prospectuses.

Prospectus [Line Items]

Expenses Restated to Reflect Current [Text]

Restated to reflect current fees.

Annual Fund Operating Expenses [Table]

Annual fund operating expenses (expenses that you pay each year as a percentage of the net asset value of your investment)
Share class:	A	C	T	F-1	F-2	F-3	529-A
Management fees²	0.21%	0.21%	0.21%	0.21%	0.21%	0.21%	0.21%
Distribution and/or service (12b-1) fees	0.26	0.99	0.25	0.24	none	none	0.22
Other expenses	0.18	0.18	0.17	0.23	0.15	0.04	0.22
Total annual fund operating expenses	0.65	1.38	0.63	0.68	0.36	0.25	0.65

Share class:	529-C	529-E	529-T	529-F-1	529-F-2	529-F-3	R-1
Management fees²	0.21%	0.21%	0.21%	0.21%	0.21%	0.21%	0.21%
Distribution and/or service (12b-1) fees	0.99	0.49	0.25	0.25	none	none	0.99
Other expenses	0.23	0.17	0.22	0.28	0.16	0.09	0.13
Total annual fund operating expenses	1.43	0.87	0.68	0.74	0.37	0.30	1.33

Share class:	R-2	R-2E	R-3	R-4	R-5E	R-5	R-6
Management fees²	0.21%	0.21%	0.21%	0.21%	0.21%	0.21%	0.21%
Distribution and/or service (12b-1) fees	0.74	0.60	0.50	0.25	none	none	none
Other expenses	0.37	0.24	0.18	0.14	0.19	0.09	0.04
Total annual fund operating expenses	1.32	1.05	0.89	0.60	0.40	0.30	0.25

²

Restated to reflect current fees.

Expense Example Narrative [Text Block]

This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds.

The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the fund’s operating expenses remain the same. You may be required to pay brokerage commissions on your purchases and sales of Class F-2, F-3, 529-F-2 or 529-F-3 shares of the fund, which are not reflected in the example.

Expense Example, With Redemption [Table]

Share class:	A	C	T	F-1	F-2	F-3	529-A	529-C	529-E	529-T	529-F-1	529-F-2	529-F-3	R-1
1 year	$439	$240	$313	$69	$37	$26	$414	$246	$89	$318	$76	$38	$31	$135
3 years	575	437	447	218	116	80	551	452	278	462	237	119	97	421
5 years	724	755	592	379	202	141	700	782	482	619	411	208	169	729
10 years	1,155	1,458	1,017	847	456	318	1,132	1,213	1,073	1,075	918	468	381	1,601

Share class:	R-2	R-2E	R-3	R-4	R-5E	R-5	R-6	For the share classes listed to the right, you would pay the following if you did not redeem your shares:	Share class:	C	529-C
1 year	$134	$107	$91	$61	$41	$31	$26		1 year	$140	$146
3 years	418	334	284	192	128	97	80		3 years	437	452
5 years	723	579	493	335	224	169	141		5 years	755	782
10 years	1,590	1,283	1,096	750	505	381	318		10 years	1,458	1,213

Expense Example, No Redemption [Table]

Share class:	R-2	R-2E	R-3	R-4	R-5E	R-5	R-6	For the share classes listed to the right, you would pay the following if you did not redeem your shares:	Share class:	C	529-C
1 year	$134	$107	$91	$61	$41	$31	$26		1 year	$140	$146
3 years	418	334	284	192	128	97	80		3 years	437	452
5 years	723	579	493	335	224	169	141		5 years	755	782
10 years	1,590	1,283	1,096	750	505	381	318		10 years	1,458	1,213