S000019341 [Member] Average Annual Total Returns

12 Months Ended

55 Months Ended

60 Months Ended

120 Months Ended

219 Months Ended

Dec. 31, 2025

Dec. 31, 2025

Dec. 31, 2025

Dec. 31, 2025

Dec. 31, 2025

ICE BofA US Municipal Securities Index (Returns do not reflect deductions for fees, expenses or taxes)

Prospectus [Line Items]

Average Annual Return, Percent

^[1]

3.92%

0.81%

2.36%

ICE AMT-Free California Municipal Index (Spliced) (Returns do not reflect deductions for fees, expenses or taxes)

Prospectus [Line Items]

Average Annual Return, Percent

^[2]

3.80%

0.67%

2.15%

ICE AMT-Free US National Municipal Index (Returns do not reflect deductions for fees, expenses or taxes)

Prospectus [Line Items]

Average Annual Return, Percent

^[1],[3]

3.90%

Performance Inception Date

Jun. 10, 2021

iShares California Muni Bond ETF

Prospectus [Line Items]

Average Annual Return, Percent

3.61%

0.50%

1.93%

Performance Inception Date

Oct. 04, 2007

iShares California Muni Bond ETF | After Taxes on Distributions

Prospectus [Line Items]

Average Annual Return, Percent

3.60%

0.49%

1.92%

iShares California Muni Bond ETF | After Taxes on Distributions and Sales

Prospectus [Line Items]

Average Annual Return, Percent

3.36%

0.90%

1.99%

[1]	The Fund began comparing its performance to the ICE BofA US Municipal Securities Index on February 28, 2026, as it represents the US national municipal securities market, and will no longer compare its performance to the ICE AMT-Free US National Municipal Index effective approximately one year from February 28, 2026.
[2]	The ICE AMT-Free California Municipal Index (Spliced) reflects the performance of the S&P California AMT-Free Municipal Bond Index through September 14, 2021 and the ICE AMT-Free California Municipal Index thereafter, which reflect the times when each index was the Underlying Index of the Fund.
[3]	The inception date of the ICE AMT-Free US National Municipal Index was June 10, 2021.