v3.26.1
S000008513 [Member] Average Annual Total Returns
 12 Months Ended 60 Months Ended 120 Months Ended 143 Months Ended 237 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
S&P Municipal Bond Index (reflects no deduction for fees, expenses or taxes)          
Prospectus [Line Items]          
Average Annual Return, Percent [1] 4.26% 1.06% 2.44%    
S&P Municipal Yield Index (reflects no deduction for fees, expenses or taxes)          
Prospectus [Line Items]          
Average Annual Return, Percent [2] 3.52% 1.94% 4.03%    
Lipper California Municipal Debt Funds Classification Average (reflects no deduction for taxes or sales loads)          
Prospectus [Line Items]          
Average Annual Return, Percent [3] 2.94% 0.44% 2.03%    
Nuveen California High Yield Municipal Bond Fund - Class A          
Prospectus [Line Items]          
Average Annual Return, Percent (1.27%) (2.12%) 1.51%    
Performance Inception Date         Mar. 28, 2006
Nuveen California High Yield Municipal Bond Fund - Class A | After Taxes on Distributions          
Prospectus [Line Items]          
Average Annual Return, Percent (1.32%) (2.17%) 1.47%    
Performance Inception Date         Mar. 28, 2006
Nuveen California High Yield Municipal Bond Fund - Class A | After Taxes on Distributions and Sales          
Prospectus [Line Items]          
Average Annual Return, Percent 0.91% (0.75%) 2.04%    
Performance Inception Date         Mar. 28, 2006
Nuveen California High Yield Municipal Bond Fund - Class I          
Prospectus [Line Items]          
Average Annual Return, Percent 3.32% (1.08%) 2.15%    
Performance Inception Date         Mar. 28, 2006
Class C          
Prospectus [Line Items]          
Average Annual Return, Percent 2.14% (2.09%) 1.29%    
Performance Inception Date       Feb. 10, 2014  
[1]
An index designed to measure the performance of the tax-exempt U.S. municipal bond market.
[2]
An index that is structured so that 70% of the index consists of bonds that are either not rated or are rated below investment grade, 20% are rated BBB/Baa, and 10% are rated single A.
[3]
Represents the average annualized total return for all reporting funds in the Lipper California Municipal Debt Funds Classification.