Expense Example - American Century Mutual Funds, Inc
|
Mar. 01, 2026
USD ($)
|
| BALANCED FUND | BALANCED FUND, INVESTOR CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
$ 91
|
| Expense Example, with Redemption, 3 Years |
284
|
| Expense Example, with Redemption, 5 Years |
494
|
| Expense Example, with Redemption, 10 Years |
1,096
|
| BALANCED FUND | BALANCED FUND, I CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
71
|
| Expense Example, with Redemption, 3 Years |
221
|
| Expense Example, with Redemption, 5 Years |
385
|
| Expense Example, with Redemption, 10 Years |
859
|
| BALANCED FUND | BALANCED FUND, R5 CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
71
|
| Expense Example, with Redemption, 3 Years |
221
|
| Expense Example, with Redemption, 5 Years |
385
|
| Expense Example, with Redemption, 10 Years |
859
|
| GROWTH FUND | GROWTH FUND, INVESTOR CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
85
|
| Expense Example, with Redemption, 3 Years |
293
|
| Expense Example, with Redemption, 5 Years |
519
|
| Expense Example, with Redemption, 10 Years |
1,166
|
| GROWTH FUND | GROWTH FUND, I CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
65
|
| Expense Example, with Redemption, 3 Years |
230
|
| Expense Example, with Redemption, 5 Years |
410
|
| Expense Example, with Redemption, 10 Years |
930
|
| GROWTH FUND | GROWTH FUND, Y CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
49
|
| Expense Example, with Redemption, 3 Years |
183
|
| Expense Example, with Redemption, 5 Years |
328
|
| Expense Example, with Redemption, 10 Years |
750
|
| GROWTH FUND | GROWTH FUND, A CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
679
|
| Expense Example, with Redemption, 3 Years |
925
|
| Expense Example, with Redemption, 5 Years |
1,191
|
| Expense Example, with Redemption, 10 Years |
1,945
|
| GROWTH FUND | GROWTH FUND, C CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
186
|
| Expense Example, with Redemption, 3 Years |
604
|
| Expense Example, with Redemption, 5 Years |
1,046
|
| Expense Example, with Redemption, 10 Years |
2,078
|
| GROWTH FUND | GROWTH FUND, R CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
136
|
| Expense Example, with Redemption, 3 Years |
450
|
| Expense Example, with Redemption, 5 Years |
786
|
| Expense Example, with Redemption, 10 Years |
1,734
|
| GROWTH FUND | GROWTH FUND, R5 CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
65
|
| Expense Example, with Redemption, 3 Years |
230
|
| Expense Example, with Redemption, 5 Years |
410
|
| Expense Example, with Redemption, 10 Years |
930
|
| GROWTH FUND | GROWTH FUND, R6 CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
49
|
| Expense Example, with Redemption, 3 Years |
183
|
| Expense Example, with Redemption, 5 Years |
328
|
| Expense Example, with Redemption, 10 Years |
750
|
| GROWTH FUND | GROWTH FUND, G CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
0
|
| Expense Example, with Redemption, 3 Years |
0
|
| Expense Example, with Redemption, 5 Years |
0
|
| Expense Example, with Redemption, 10 Years |
0
|
| HERITAGE FUND | HERITAGE FUND, INVESTOR CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
102
|
| Expense Example, with Redemption, 3 Years |
319
|
| Expense Example, with Redemption, 5 Years |
553
|
| Expense Example, with Redemption, 10 Years |
1,225
|
| HERITAGE FUND | HERITAGE FUND, I CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
82
|
| Expense Example, with Redemption, 3 Years |
256
|
| Expense Example, with Redemption, 5 Years |
445
|
| Expense Example, with Redemption, 10 Years |
990
|
| HERITAGE FUND | HERITAGE FUND, Y CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
67
|
| Expense Example, with Redemption, 3 Years |
208
|
| Expense Example, with Redemption, 5 Years |
363
|
| Expense Example, with Redemption, 10 Years |
811
|
| HERITAGE FUND | HERITAGE FUND, A CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
695
|
| Expense Example, with Redemption, 3 Years |
949
|
| Expense Example, with Redemption, 5 Years |
1,223
|
| Expense Example, with Redemption, 10 Years |
1,999
|
| HERITAGE FUND | HERITAGE FUND, C CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
203
|
| Expense Example, with Redemption, 3 Years |
628
|
| Expense Example, with Redemption, 5 Years |
1,079
|
| Expense Example, with Redemption, 10 Years |
2,132
|
| HERITAGE FUND | HERITAGE FUND, R CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
153
|
| Expense Example, with Redemption, 3 Years |
475
|
| Expense Example, with Redemption, 5 Years |
819
|
| Expense Example, with Redemption, 10 Years |
1,789
|
| HERITAGE FUND | HERITAGE FUND, R5 CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
82
|
| Expense Example, with Redemption, 3 Years |
256
|
| Expense Example, with Redemption, 5 Years |
445
|
| Expense Example, with Redemption, 10 Years |
990
|
| HERITAGE FUND | HERITAGE FUND, R6 CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
67
|
| Expense Example, with Redemption, 3 Years |
208
|
| Expense Example, with Redemption, 5 Years |
363
|
| Expense Example, with Redemption, 10 Years |
811
|
| HERITAGE FUND | HERITAGE FUND, G CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
0
|
| Expense Example, with Redemption, 3 Years |
0
|
| Expense Example, with Redemption, 5 Years |
0
|
| Expense Example, with Redemption, 10 Years |
0
|
| LARGE CAP EQUITY FUND | LARGE CAP EQUITY FUND, INVESTOR CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
81
|
| Expense Example, with Redemption, 3 Years |
253
|
| Expense Example, with Redemption, 5 Years |
439
|
| Expense Example, with Redemption, 10 Years |
978
|
| LARGE CAP EQUITY FUND | LARGE CAP EQUITY FUND, I CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
60
|
| Expense Example, with Redemption, 3 Years |
189
|
| Expense Example, with Redemption, 5 Years |
330
|
| Expense Example, with Redemption, 10 Years |
738
|
| LARGE CAP EQUITY FUND | LARGE CAP EQUITY FUND, Y CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
45
|
| Expense Example, with Redemption, 3 Years |
142
|
| Expense Example, with Redemption, 5 Years |
247
|
| Expense Example, with Redemption, 10 Years |
555
|
| LARGE CAP EQUITY FUND | LARGE CAP EQUITY FUND, A CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
675
|
| Expense Example, with Redemption, 3 Years |
887
|
| Expense Example, with Redemption, 5 Years |
1,117
|
| Expense Example, with Redemption, 10 Years |
1,773
|
| LARGE CAP EQUITY FUND | LARGE CAP EQUITY FUND, C CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
182
|
| Expense Example, with Redemption, 3 Years |
564
|
| Expense Example, with Redemption, 5 Years |
970
|
| Expense Example, with Redemption, 10 Years |
1,906
|
| LARGE CAP EQUITY FUND | LARGE CAP EQUITY FUND, R CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
132
|
| Expense Example, with Redemption, 3 Years |
410
|
| Expense Example, with Redemption, 5 Years |
708
|
| Expense Example, with Redemption, 10 Years |
1,556
|
| LARGE CAP EQUITY FUND | LARGE CAP EQUITY FUND, R5 CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
60
|
| Expense Example, with Redemption, 3 Years |
189
|
| Expense Example, with Redemption, 5 Years |
330
|
| Expense Example, with Redemption, 10 Years |
738
|
| LARGE CAP EQUITY FUND | LARGE CAP EQUITY FUND, R6 CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
45
|
| Expense Example, with Redemption, 3 Years |
142
|
| Expense Example, with Redemption, 5 Years |
247
|
| Expense Example, with Redemption, 10 Years |
555
|
| LARGE CAP EQUITY FUND | LARGE CAP EQUITY FUND, G CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
0
|
| Expense Example, with Redemption, 3 Years |
0
|
| Expense Example, with Redemption, 5 Years |
0
|
| Expense Example, with Redemption, 10 Years |
0
|
| SELECT FUND | SELECT FUND, INVESTOR CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
92
|
| Expense Example, with Redemption, 3 Years |
305
|
| Expense Example, with Redemption, 5 Years |
535
|
| Expense Example, with Redemption, 10 Years |
1,194
|
| SELECT FUND | SELECT FUND, I CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
72
|
| Expense Example, with Redemption, 3 Years |
242
|
| Expense Example, with Redemption, 5 Years |
426
|
| Expense Example, with Redemption, 10 Years |
959
|
| SELECT FUND | SELECT FUND, Y CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
56
|
| Expense Example, with Redemption, 3 Years |
194
|
| Expense Example, with Redemption, 5 Years |
344
|
| Expense Example, with Redemption, 10 Years |
779
|
| SELECT FUND | SELECT FUND, A CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
686
|
| Expense Example, with Redemption, 3 Years |
936
|
| Expense Example, with Redemption, 5 Years |
1,205
|
| Expense Example, with Redemption, 10 Years |
1,971
|
| SELECT FUND | SELECT FUND, C CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
193
|
| Expense Example, with Redemption, 3 Years |
615
|
| Expense Example, with Redemption, 5 Years |
1,061
|
| Expense Example, with Redemption, 10 Years |
2,104
|
| SELECT FUND | SELECT FUND, R CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
143
|
| Expense Example, with Redemption, 3 Years |
461
|
| Expense Example, with Redemption, 5 Years |
801
|
| Expense Example, with Redemption, 10 Years |
1,760
|
| SELECT FUND | SELECT FUND, R5 CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
72
|
| Expense Example, with Redemption, 3 Years |
242
|
| Expense Example, with Redemption, 5 Years |
426
|
| Expense Example, with Redemption, 10 Years |
959
|
| SELECT FUND | SELECT FUND, R6 CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
56
|
| Expense Example, with Redemption, 3 Years |
194
|
| Expense Example, with Redemption, 5 Years |
344
|
| Expense Example, with Redemption, 10 Years |
779
|
| SELECT FUND | SELECT FUND, G CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
0
|
| Expense Example, with Redemption, 3 Years |
0
|
| Expense Example, with Redemption, 5 Years |
0
|
| Expense Example, with Redemption, 10 Years |
0
|
| SMALL CAP GROWTH FUND | SMALL CAP GROWTH FUND, INVESTOR CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
115
|
| Expense Example, with Redemption, 3 Years |
360
|
| Expense Example, with Redemption, 5 Years |
623
|
| Expense Example, with Redemption, 10 Years |
1,374
|
| SMALL CAP GROWTH FUND | SMALL CAP GROWTH FUND, I CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
95
|
| Expense Example, with Redemption, 3 Years |
297
|
| Expense Example, with Redemption, 5 Years |
515
|
| Expense Example, with Redemption, 10 Years |
1,143
|
| SMALL CAP GROWTH FUND | SMALL CAP GROWTH FUND, Y CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
80
|
| Expense Example, with Redemption, 3 Years |
250
|
| Expense Example, with Redemption, 5 Years |
434
|
| Expense Example, with Redemption, 10 Years |
966
|
| SMALL CAP GROWTH FUND | SMALL CAP GROWTH FUND, A CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
708
|
| Expense Example, with Redemption, 3 Years |
987
|
| Expense Example, with Redemption, 5 Years |
1,288
|
| Expense Example, with Redemption, 10 Years |
2,136
|
| SMALL CAP GROWTH FUND | SMALL CAP GROWTH FUND, C CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
217
|
| Expense Example, with Redemption, 3 Years |
668
|
| Expense Example, with Redemption, 5 Years |
1,145
|
| Expense Example, with Redemption, 10 Years |
2,268
|
| SMALL CAP GROWTH FUND | SMALL CAP GROWTH FUND, R CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
166
|
| Expense Example, with Redemption, 3 Years |
515
|
| Expense Example, with Redemption, 5 Years |
887
|
| Expense Example, with Redemption, 10 Years |
1,931
|
| SMALL CAP GROWTH FUND | SMALL CAP GROWTH FUND, R5 CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
95
|
| Expense Example, with Redemption, 3 Years |
297
|
| Expense Example, with Redemption, 5 Years |
515
|
| Expense Example, with Redemption, 10 Years |
1,143
|
| SMALL CAP GROWTH FUND | SMALL CAP GROWTH FUND, R6 CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
80
|
| Expense Example, with Redemption, 3 Years |
250
|
| Expense Example, with Redemption, 5 Years |
434
|
| Expense Example, with Redemption, 10 Years |
966
|
| SMALL CAP GROWTH FUND | SMALL CAP GROWTH FUND, G CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
0
|
| Expense Example, with Redemption, 3 Years |
0
|
| Expense Example, with Redemption, 5 Years |
0
|
| Expense Example, with Redemption, 10 Years |
0
|
| ULTRA FUND | ULTRA FUND, INVESTOR CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
89
|
| Expense Example, with Redemption, 3 Years |
282
|
| Expense Example, with Redemption, 5 Years |
492
|
| Expense Example, with Redemption, 10 Years |
1,094
|
| ULTRA FUND | ULTRA FUND, I CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
69
|
| Expense Example, with Redemption, 3 Years |
219
|
| Expense Example, with Redemption, 5 Years |
383
|
| Expense Example, with Redemption, 10 Years |
857
|
| ULTRA FUND | ULTRA FUND, Y CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
53
|
| Expense Example, with Redemption, 3 Years |
171
|
| Expense Example, with Redemption, 5 Years |
300
|
| Expense Example, with Redemption, 10 Years |
676
|
| ULTRA FUND | ULTRA FUND, A CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
683
|
| Expense Example, with Redemption, 3 Years |
915
|
| Expense Example, with Redemption, 5 Years |
1,165
|
| Expense Example, with Redemption, 10 Years |
1,879
|
| ULTRA FUND | ULTRA FUND, C CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
190
|
| Expense Example, with Redemption, 3 Years |
593
|
| Expense Example, with Redemption, 5 Years |
1,020
|
| Expense Example, with Redemption, 10 Years |
2,013
|
| ULTRA FUND | ULTRA FUND, R CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
140
|
| Expense Example, with Redemption, 3 Years |
439
|
| Expense Example, with Redemption, 5 Years |
759
|
| Expense Example, with Redemption, 10 Years |
1,666
|
| ULTRA FUND | ULTRA FUND, R5 CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
69
|
| Expense Example, with Redemption, 3 Years |
219
|
| Expense Example, with Redemption, 5 Years |
383
|
| Expense Example, with Redemption, 10 Years |
857
|
| ULTRA FUND | ULTRA FUND, R6 CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
53
|
| Expense Example, with Redemption, 3 Years |
171
|
| Expense Example, with Redemption, 5 Years |
300
|
| Expense Example, with Redemption, 10 Years |
676
|
| ULTRA FUND | ULTRA FUND, G CLASS |
|
| Prospectus [Line Items] |
|
| Expense Example, with Redemption, 1 Year |
0
|
| Expense Example, with Redemption, 3 Years |
0
|
| Expense Example, with Redemption, 5 Years |
0
|
| Expense Example, with Redemption, 10 Years |
$ 0
|