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Shareholder Report
 6 Months Ended
Dec. 31, 2024
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, 2024
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, 2024 to December 31, 2024.
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 $ 22,893,618,103
Holdings Count | shares 411
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of December 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$22,893,618,103
  
Number of Holdings
411
  
Holdings [Text Block]   EFFECTIVE MATURITY DIVERSIFICATION (% of Fund's net assets)   Days   1-7 33.1   8-30 29.6   31-60 19.6   61-90 9.7   91-180 6.4   >180 2.3             U.S. Treasury Obligations 60.2 U.S. Government Agency - Debt 35.0 Repurchase Agreements 5.5 ASSET ALLOCATION (% of Fund's net assets)     U.S. Treasury Obligations - 60.2           U.S. Government Agency - Debt - 35.0       Repurchase Agreements - 5.5              Net Other Assets (Liabilities) - (0.7)%