v3.25.4
Shareholder Report, Average Annual Return (Details)
 12 Months Ended 15 Months Ended 60 Months Ended 74 Months Ended 103 Months Ended 120 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
C000082487 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Class R Shares          
Average Annual Return, Percent 13.17%   5.81%     7.87%
C000051481 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Class K Shares          
Average Annual Return, Percent 13.92%   6.54%     8.61%
C000088835 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor C Shares (with sales charge)          
Average Annual Return, Percent 11.51%   5.22%     7.42%
C000011997 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor A Shares (with sales charge)          
Average Annual Return, Percent 7.32%   4.87%     7.51%
C000011998 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Institutional Shares          
Average Annual Return, Percent 13.60%   6.28%     8.36%
C000012000 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Institutional Shares          
Average Annual Return, Percent 16.88%   8.84%     10.26%
C000011999 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor A Shares (with sales charge)          
Average Annual Return, Percent 10.55%   7.42%     9.40%
C000088838 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor C Shares (with sales charge)          
Average Annual Return, Percent 14.70%   7.77%     9.30%
C000051482 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Class K Shares          
Average Annual Return, Percent 17.23%   9.13%     10.51%
C000082488 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Class R Shares          
Average Annual Return, Percent 16.41%   8.36%     9.76%
C000082489 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Class R Shares          
Average Annual Return, Percent 11.51%   3.95%     5.96%
C000051483 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Class K Shares          
Average Annual Return, Percent 12.24%   4.67%     6.68%
C000088841 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor C Shares (with sales charge)          
Average Annual Return, Percent 9.88%   3.37%     5.51%
C000012001 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor A Shares (with sales charge)          
Average Annual Return, Percent 5.87%   3.03%     5.59%
C000012002 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Institutional Shares          
Average Annual Return, Percent 12.01%   4.40%     6.43%
C000063261 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Institutional Shares          
Average Annual Return, Percent 20.05%   10.38%     11.23%
C000063260 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor A Shares (with sales charge)          
Average Annual Return, Percent 13.50%   8.93%     10.36%
C000088844 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor C Shares (with sales charge)          
Average Annual Return, Percent 17.85%   9.29%     10.26%
C000063262 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Class K Shares          
Average Annual Return, Percent 20.37%   10.66%     11.48%
C000082490 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Class R Shares          
Average Annual Return, Percent 19.53%   9.89%     10.73%
C000089952 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Class R Shares          
Average Annual Return, Percent 14.76%   6.99%     8.80%
C000089956 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Class K Shares          
Average Annual Return, Percent 15.57%   7.74%     9.54%
C000089954 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor C Shares (with sales charge)          
Average Annual Return, Percent 13.10%   6.40%     8.34%
C000089953 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor A Shares (with sales charge)          
Average Annual Return, Percent 9.00%   6.06%     8.43%
C000089955 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Institutional Shares          
Average Annual Return, Percent 15.28%   7.47%     9.28%
C000089959 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Institutional Shares          
Average Annual Return, Percent 18.47%   9.90%     10.89%
C000089957 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor A Shares (with sales charge)          
Average Annual Return, Percent 11.93%   8.45%     10.03%
C000089958 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor C Shares (with sales charge)          
Average Annual Return, Percent 16.26%   8.80%     9.94%
C000089960 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Class K Shares          
Average Annual Return, Percent 18.70%   10.17%     11.15%
C000089961 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Class R Shares          
Average Annual Return, Percent 17.87%   9.40%     10.39%
C000089966 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Class R Shares          
Average Annual Return, Percent 20.39%   10.21%     10.91%
C000089965 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Class K Shares          
Average Annual Return, Percent 21.21%   10.99%     11.68%
C000089963 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor C Shares (with sales charge)          
Average Annual Return, Percent 18.73%   9.60%     10.45%
C000089962 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor A Shares (with sales charge)          
Average Annual Return, Percent 14.25%   9.25%     10.54%
C000089964 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Institutional Shares          
Average Annual Return, Percent 20.92%   10.71%     11.42%
C000187070 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Institutional Shares          
Average Annual Return, Percent 21.08%   10.75%   11.05%  
C000187068 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor A Shares (with sales charge)          
Average Annual Return, Percent 14.44%   9.29%   10.07%  
C000187069 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor C Shares (with sales charge)          
Average Annual Return, Percent 18.90%   9.65%   9.98%  
C000187072 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Class K Shares          
Average Annual Return, Percent 21.41%   11.02%   11.30%  
C000187071 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Class R Shares          
Average Annual Return, Percent 20.53%   10.25%   10.54%  
C000213847 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Class R Shares          
Average Annual Return, Percent 20.44%   10.23% 11.37%    
C000213844 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Class K Shares          
Average Annual Return, Percent 21.39%   11.01% 12.15%    
C000213843 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor C Shares (with sales charge)          
Average Annual Return, Percent 18.76%   9.63% 10.76%    
C000213845 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor A Shares (with sales charge)          
Average Annual Return, Percent 14.32%   9.26% 10.62%    
C000213846 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Institutional Shares          
Average Annual Return, Percent 21.02%   10.73% 11.88%    
C000251825 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Institutional Shares          
Average Annual Return, Percent 20.98% 19.35%        
C000251826 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor A Shares (with sales charge)          
Average Annual Return, Percent 14.39% 12.77%        
C000251827 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor C Shares (with sales charge)          
Average Annual Return, Percent 18.84% 17.90%        
C000251828 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Class K Shares          
Average Annual Return, Percent 21.26% 19.70%        
C000251824 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Class R Shares          
Average Annual Return, Percent 20.45% 18.68%        
Without Sales Load [Member] | C000088835 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor C Shares          
Average Annual Return, Percent 12.51%   5.22%     7.42%
Without Sales Load [Member] | C000011997 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor A Shares          
Average Annual Return, Percent 13.27%   6.01%     8.09%
Without Sales Load [Member] | C000011999 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor A Shares          
Average Annual Return, Percent 16.67%   8.59%     9.99%
Without Sales Load [Member] | C000088838 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor C Shares          
Average Annual Return, Percent 15.70%   7.77%     9.30%
Without Sales Load [Member] | C000088841 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor C Shares          
Average Annual Return, Percent 10.88%   3.37%     5.51%
Without Sales Load [Member] | C000012001 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor A Shares          
Average Annual Return, Percent 11.74%   4.14%     6.16%
Without Sales Load [Member] | C000063260 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor A Shares          
Average Annual Return, Percent 19.79%   10.11%     10.95%
Without Sales Load [Member] | C000088844 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor C Shares          
Average Annual Return, Percent 18.85%   9.29%     10.26%
Without Sales Load [Member] | C000089954 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor C Shares          
Average Annual Return, Percent 14.10%   6.40%     8.34%
Without Sales Load [Member] | C000089953 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor A Shares          
Average Annual Return, Percent 15.04%   7.21%     9.02%
Without Sales Load [Member] | C000089957 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor A Shares          
Average Annual Return, Percent 18.13%   9.63%     10.62%
Without Sales Load [Member] | C000089958 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor C Shares          
Average Annual Return, Percent 17.26%   8.80%     9.94%
Without Sales Load [Member] | C000089963 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor C Shares          
Average Annual Return, Percent 19.73%   9.60%     10.45%
Without Sales Load [Member] | C000089962 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor A Shares          
Average Annual Return, Percent 20.58%   10.43%     11.14%
Without Sales Load [Member] | C000187068 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor A Shares          
Average Annual Return, Percent 20.79%   10.48%   10.77%  
Without Sales Load [Member] | C000187069 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor C Shares          
Average Annual Return, Percent 19.90%   9.65%   9.98%  
Without Sales Load [Member] | C000213843 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor C Shares          
Average Annual Return, Percent 19.76%   9.63% 10.76%    
Without Sales Load [Member] | C000213845 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor A Shares          
Average Annual Return, Percent 20.66%   10.45% 11.59%    
Without Sales Load [Member] | C000251826 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor A Shares          
Average Annual Return, Percent 20.73% 19.02%        
Without Sales Load [Member] | C000251827 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Investor C Shares          
Average Annual Return, Percent 19.84% 17.90%        
Russell 1000 Index [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Russell 1000® Index          
Average Annual Return, Percent 17.37% 16.36% 13.59% 15.52% 14.55% 14.59%
Bloomberg U S Aggregate Bond C000082489 Index [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Bloomberg U.S. Aggregate Bond Index          
Average Annual Return, Percent 7.30%   (0.36%)     2.01%
Bloomberg U S Aggregate Bond C000051483 Index [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Bloomberg U.S. Aggregate Bond Index          
Average Annual Return, Percent 7.30%   (0.36%)     2.01%
Bloomberg U S Aggregate Bond C000012002 Index [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Bloomberg U.S. Aggregate Bond Index          
Average Annual Return, Percent 7.30%   (0.36%)     2.01%
Bloomberg U S Aggregate Bond C000088841 Index [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Bloomberg U.S. Aggregate Bond Index          
Average Annual Return, Percent 7.30%   (0.36%)     2.01%
Bloomberg U S Aggregate Bond C000012001 Index [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Bloomberg U.S. Aggregate Bond Index          
Average Annual Return, Percent 7.30%   (0.36%)     2.01%
LifePath Dynamic 2030 Fund Custom Benchmark [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name LifePath Dynamic 2030 Fund Custom Benchmark          
Average Annual Return, Percent 14.33%   5.95%     7.94%
Bloomberg U S Aggregate Bond Index [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Bloomberg U.S. Aggregate Bond Index          
Average Annual Return, Percent 7.30% 2.89% (0.36%) 0.95% 1.75% 2.01%
LifePath Dynamic 2040 Fund Custom Benchmark [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name LifePath Dynamic 2040 Fund Custom Benchmark          
Average Annual Return, Percent 17.67%   8.48%     9.91%
Russell 1000 C000082489 Index [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Russell 1000® Index          
Average Annual Return, Percent 17.37%   13.59%     14.59%
Russell 1000 C000051483 Index [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Russell 1000® Index          
Average Annual Return, Percent 17.37%   13.59%     14.59%
Russell 1000 C000012002 Index [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Russell 1000® Index          
Average Annual Return, Percent 17.37%   13.59%     14.59%
Russell 1000 C000088841 Index [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Russell 1000® Index          
Average Annual Return, Percent 17.37%   13.59%     14.59%
Russell 1000 C000012001 Index [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Russell 1000® Index          
Average Annual Return, Percent 17.37%   13.59%     14.59%
LifePath Dynamic Retirement Fund Custom Benchmark [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name LifePath Dynamic Retirement Fund Custom Benchmark          
Average Annual Return, Percent 12.68%   4.13%     6.02%
LifePath Dynamic 2050 Fund Custom Benchmark [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name LifePath Dynamic 2050 Fund Custom Benchmark          
Average Annual Return, Percent 20.74%   10.41%     11.19%
LifePath Dynamic 2035 Fund Custom Benchmark [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name LifePath Dynamic 2035 Fund Custom Benchmark          
Average Annual Return, Percent 16.08%   7.27%     8.97%
LifePath Dynamic 2045 Fund Custom Benchmark [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name LifePath Dynamic 2045 Fund Custom Benchmark          
Average Annual Return, Percent 19.15%   9.58%     10.68%
LifePath Dynamic 2055 Fund Custom Benchmark [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name LifePath Dynamic 2055 Fund Custom Benchmark          
Average Annual Return, Percent 21.59%   10.76%     11.38%
LifePath Dynamic 2060 Fund Custom Benchmark [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name LifePath Dynamic 2060 Fund Custom Benchmark          
Average Annual Return, Percent 21.74%   10.80%   11.21%  
LifePath Dynamic 2065 Fund Custom Benchmark [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name LifePath Dynamic 2065 Fund Custom Benchmark          
Average Annual Return, Percent 21.74%   10.79% 12.19%    
LifePath Dynamic 2070 Fund Custom Benchmark [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name LifePath Dynamic 2070 Fund Custom Benchmark          
Average Annual Return, Percent 21.74% 16.39%