XML 12 R2.htm IDEA: XBRL DOCUMENT v3.25.4
Shareholder Report
 6 Months Ended
Dec. 31, 2025
USD ($)
shares
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name The North Carolina Capital Management Trust
Entity Central Index Key 0000702149
Entity Investment Company Type N-1A
Document Period End Date Dec. 31, 2025
North Carolina Capital Management Trust - Government Portfolio  
Shareholder Report [Line Items]  
Fund Name Government Portfolio
Class Name Government Portfolio
Trading Symbol NCCTX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Government Portfolio for the period July 1, 2025 to December 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-222-3232.
Additional Information Phone Number 1-800-222-3232
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Government Portfolio 
$ 7 
0.14%
  
Expenses Paid, Amount $ 7
Expense Ratio, Percent 0.14%
Net Assets $ 23,788,220,491
Holdings Count | shares 466
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of December 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$23,788,220,491
  
Number of Holdings
466
  
Holdings [Text Block]   EFFECTIVE MATURITY DIVERSIFICATION (% of Fund's net assets)   Days   1-7 62.4   8-30 12.9   31-60 11.3   61-90 7.8   91-180 7.7   >180 1.6             U.S. Treasury Obligations 39.3 U.S. Government Agency - Debt 33.7 Repurchase Agreements 30.7 ASSET ALLOCATION (% of Fund's net assets)     U.S. Treasury Obligations - 39.3           U.S. Government Agency - Debt - 33.7       Repurchase Agreements - 30.7             Net Other Assets (Liabilities) - (3.7)%