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Shareholder Report, Average Annual Return (Details)
 12 Months Ended 60 Months Ended 120 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
C000021094_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.88%    
C000021094_1_BBIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   14.42%  
C000021094_1_BBIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     14.82%
C000021093_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.88%    
C000021093_1_BBIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   14.42%  
C000021093_1_BBIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     14.82%
C000243078_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.88%    
C000243078_1_BBIndexMember_LOCMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 22.04%    
C000021092_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.88%    
C000021092_1_BBIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   14.42%  
C000021092_1_BBIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     14.82%
C000021091_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.88%    
C000021091_1_BBIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   14.42%  
C000021091_1_BBIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     14.82%
C000021086_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.88%    
C000021086_1_BBIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   14.42%  
C000021086_1_BBIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     14.82%
C000021085_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.88%    
C000021085_1_BBIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   14.42%  
C000021085_1_BBIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     14.82%
C000021084_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.88%    
C000021084_1_BBIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   14.42%  
C000021084_1_BBIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     14.82%
C000021083_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.88%    
C000021083_1_BBIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   14.42%  
C000021083_1_BBIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     14.82%
C000046805_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.88%    
C000046805_1_BBIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   14.42%  
C000046805_1_BBIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     14.82%
C000046804_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.88%    
C000046804_1_BBIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   14.42%  
C000046804_1_BBIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     14.82%
C000021075_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.88%    
C000021075_1_BBIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   14.42%  
C000021075_1_BBIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     14.82%
C000021074_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.88%    
C000021074_1_BBIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   14.42%  
C000021074_1_BBIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     14.82%
C000211329_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.88%    
C000211329_1_BBIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   14.42%  
C000211329_1_BBIndexMember_LOCMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 15.49%    
C000021063_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.88%    
C000021063_1_BBIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   14.42%  
C000021063_1_BBIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     14.82%
C000021062_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.88%    
C000021062_1_BBIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   14.42%  
C000021062_1_BBIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     14.82%
C000243079_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.88%    
C000243079_1_BBIndexMember_LOCMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 22.04%    
C000021100_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.88%    
C000021100_1_BBIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   14.42%  
C000021100_1_BBIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     14.82%
C000021099_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.88%    
C000021099_1_BBIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   14.42%  
C000021099_1_BBIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     14.82%
C000021082_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.88%    
C000021082_1_BBIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   14.42%  
C000021082_1_BBIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     14.82%
C000021081_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.88%    
C000021081_1_BBIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   14.42%  
C000021081_1_BBIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     14.82%
C000021080_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.88%    
C000021080_1_BBIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   14.42%  
C000021080_1_BBIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     14.82%
C000243080_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.88%    
C000243080_1_BBIndexMember_LOCMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 22.04%    
C000046803_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.88%    
C000046803_1_BBIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   14.42%  
C000046803_1_BBIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     14.82%
C000046802_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.88%    
C000046802_1_BBIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   14.42%  
C000046802_1_BBIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     14.82%
C000243077_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.88%    
C000243077_1_BBIndexMember_LOCMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 22.04%    
C000021051_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.88%    
C000021051_1_BBIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   14.42%  
C000021051_1_BBIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     14.82%
C000021050_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.88%    
C000021050_1_BBIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   14.42%  
C000021050_1_BBIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     14.82%
C000046807_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.88%    
C000046807_1_BBIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   14.42%  
C000046807_1_BBIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     14.82%
C000046806_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.88%    
C000046806_1_BBIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   14.42%  
C000046806_1_BBIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     14.82%
C000021094_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 14.03%    
C000021094_NoLoadClassMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   12.43%  
C000021094_NoLoadClassMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     12.42%
C000021094_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 16.48%    
C000021094_0_AdditionalIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   9.59%  
C000021094_0_AdditionalIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     10.51%
C000021093_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 14.11%    
C000021093_NoLoadClassMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   12.52%  
C000021093_NoLoadClassMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     12.51%
C000021093_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 16.48%    
C000021093_0_AdditionalIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   9.59%  
C000021093_0_AdditionalIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     10.51%
C000243078_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 23.07%    
C000243078_NoLoadClassMember_2025-01-01_2025-12-31Member      
Average Annual Return [Line Items]      
Average Annual Return, Percent 30.17%    
C000243078_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 21.90%    
C000243078_0_AdditionalIndexMember_LOCMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 28.52%    
C000021092_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 23.28%    
C000021092_NoLoadClassMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   16.75%  
C000021092_NoLoadClassMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     23.67%
C000021092_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 21.90%    
C000021092_0_AdditionalIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   17.21%  
C000021092_0_AdditionalIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     22.34%
C000021091_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 23.36%    
C000021091_NoLoadClassMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   16.83%  
C000021091_NoLoadClassMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     23.76%
C000021091_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 21.90%    
C000021091_0_AdditionalIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   17.21%  
C000021091_0_AdditionalIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     22.34%
C000021086_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 2.90%    
C000021086_NoLoadClassMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   3.98%  
C000021086_NoLoadClassMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     3.61%
C000021086_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 3.31%    
C000021086_0_AdditionalIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   4.76%  
C000021086_0_AdditionalIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     3.53%
C000021085_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 3.04%    
C000021085_NoLoadClassMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   4.12%  
C000021085_NoLoadClassMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     3.77%
C000021085_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 3.31%    
C000021085_0_AdditionalIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   4.76%  
C000021085_0_AdditionalIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     3.53%
C000021084_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 3.06%    
C000021084_NoLoadClassMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   4.15%  
C000021084_NoLoadClassMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     3.79%
C000021084_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 3.31%    
C000021084_0_AdditionalIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   4.76%  
C000021084_0_AdditionalIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     3.53%
C000021083_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 3.10%    
C000021083_NoLoadClassMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   4.23%  
C000021083_NoLoadClassMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     3.87%
C000021083_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 3.31%    
C000021083_0_AdditionalIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   4.76%  
C000021083_0_AdditionalIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     3.53%
C000046805_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 11.24%    
C000046805_NoLoadClassMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   6.98%  
C000046805_NoLoadClassMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     7.59%
C000046805_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 12.37%    
C000046805_0_AdditionalIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   7.67%  
C000046805_0_AdditionalIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     10.27%
C000046804_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 11.40%    
C000046804_NoLoadClassMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   7.08%  
C000046804_NoLoadClassMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     7.68%
C000046804_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 12.37%    
C000046804_0_AdditionalIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   7.67%  
C000046804_0_AdditionalIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     10.27%
C000021075_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 24.42%    
C000021075_NoLoadClassMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   14.70%  
C000021075_NoLoadClassMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     12.89%
C000021075_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 18.63%    
C000021075_0_AdditionalIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   13.48%  
C000021075_0_AdditionalIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     13.27%
C000021074_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 24.52%    
C000021074_NoLoadClassMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   14.79%  
C000021074_NoLoadClassMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     12.98%
C000021074_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 18.63%    
C000021074_0_AdditionalIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   13.48%  
C000021074_0_AdditionalIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     13.27%
C000211329_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 14.10%    
C000211329_NoLoadClassMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   3.92%  
C000211329_NoLoadClassMember_2025-01-01_2025-12-31Member      
Average Annual Return [Line Items]      
Average Annual Return, Percent 8.37%    
C000211329_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 15.54%    
C000211329_0_AdditionalIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   6.79%  
C000211329_0_AdditionalIndexMember_LOCMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 9.77%    
C000021063_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 14.27%    
C000021063_NoLoadClassMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   4.10%  
C000021063_NoLoadClassMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     8.66%
C000021063_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 15.54%    
C000021063_0_AdditionalIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   6.79%  
C000021063_0_AdditionalIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     9.72%
C000021062_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 14.39%    
C000021062_NoLoadClassMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   4.18%  
C000021062_NoLoadClassMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     8.75%
C000021062_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 15.54%    
C000021062_0_AdditionalIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   6.79%  
C000021062_0_AdditionalIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     9.72%
C000243079_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 14.89%    
C000243079_NoLoadClassMember_2025-01-01_2025-12-31Member      
Average Annual Return [Line Items]      
Average Annual Return, Percent 26.39%    
C000243079_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 14.94%    
C000243079_0_AdditionalIndexMember_LOCMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 25.08%    
C000021100_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 15.08%    
C000021100_NoLoadClassMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   16.38%  
C000021100_NoLoadClassMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     13.31%
C000021100_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 14.94%    
C000021100_0_AdditionalIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   15.47%  
C000021100_0_AdditionalIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     13.01%
C000021099_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 15.18%    
C000021099_NoLoadClassMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   16.45%  
C000021099_NoLoadClassMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     13.40%
C000021099_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 14.94%    
C000021099_0_AdditionalIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   15.47%  
C000021099_0_AdditionalIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     13.01%
C000021082_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 10.34%    
C000021082_NoLoadClassMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   23.86%  
C000021082_NoLoadClassMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     7.69%
C000021082_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 7.34%    
C000021082_0_AdditionalIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   23.92%  
C000021082_0_AdditionalIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     8.07%
C000021081_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 10.49%    
C000021081_NoLoadClassMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   24.08%  
C000021081_NoLoadClassMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     7.87%
C000021081_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 7.34%    
C000021081_0_AdditionalIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   23.92%  
C000021081_0_AdditionalIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     8.07%
C000021080_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 10.59%    
C000021080_NoLoadClassMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   24.18%  
C000021080_NoLoadClassMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     7.96%
C000021080_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 7.34%    
C000021080_0_AdditionalIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   23.92%  
C000021080_0_AdditionalIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     8.07%
C000243080_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent (3.23%)    
C000243080_NoLoadClassMember_2025-01-01_2025-12-31Member      
Average Annual Return [Line Items]      
Average Annual Return, Percent 0.21%    
C000243080_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 2.15%    
C000243080_0_AdditionalIndexMember_LOCMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 6.49%    
C000046803_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent (3.04%)    
C000046803_NoLoadClassMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   3.62%  
C000046803_NoLoadClassMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     5.79%
C000046803_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 2.15%    
C000046803_0_AdditionalIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   6.53%  
C000046803_0_AdditionalIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     7.77%
C000046802_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent (2.98%)    
C000046802_NoLoadClassMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   3.70%  
C000046802_NoLoadClassMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     5.87%
C000046802_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 2.15%    
C000046802_0_AdditionalIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   6.53%  
C000046802_0_AdditionalIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     7.77%
C000243077_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 6.54%    
C000243077_NoLoadClassMember_2025-01-01_2025-12-31Member      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.25%    
C000243077_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 5.74%    
C000243077_0_AdditionalIndexMember_LOCMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 16.58%    
C000021051_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 6.73%    
C000021051_NoLoadClassMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   8.02%  
C000021051_NoLoadClassMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     12.42%
C000021051_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 5.74%    
C000021051_0_AdditionalIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   8.44%  
C000021051_0_AdditionalIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     13.97%
C000021050_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 6.80%    
C000021050_NoLoadClassMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   8.10%  
C000021050_NoLoadClassMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     12.51%
C000021050_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 5.74%    
C000021050_0_AdditionalIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   8.44%  
C000021050_0_AdditionalIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     13.97%
C000046807_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 34.29%    
C000046807_NoLoadClassMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   15.11%  
C000046807_NoLoadClassMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     15.71%
C000046807_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 26.18%    
C000046807_0_AdditionalIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   11.08%  
C000046807_0_AdditionalIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     11.83%
C000046806_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 34.39%    
C000046806_NoLoadClassMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   15.19%  
C000046806_NoLoadClassMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     15.81%
C000046806_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 26.18%    
C000046806_0_AdditionalIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   11.08%  
C000046806_0_AdditionalIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     11.83%