INVESTMENTS - Schedule of Industry Composition of Portfolio as a Percentage of Fair Value (Details) - Investments at Fair Value - Industry Concentration Risk	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Schedule of Investments [Line Items]
% of Fair Value	100.00%	100.00%
Aerospace & Defense
Schedule of Investments [Line Items]
% of Fair Value	1.79%	1.53%
Automotive
Schedule of Investments [Line Items]
% of Fair Value	1.01%	1.37%
Banking, Finance, Insurance & Real Estate
Schedule of Investments [Line Items]
% of Fair Value	5.93%	6.54%
Beverage, Food & Tobacco
Schedule of Investments [Line Items]
% of Fair Value	5.26%	4.82%
Capital Equipment
Schedule of Investments [Line Items]
% of Fair Value	8.13%	7.90%
Chemicals, Plastics & Rubber
Schedule of Investments [Line Items]
% of Fair Value	1.44%	1.53%
Construction & Building
Schedule of Investments [Line Items]
% of Fair Value	6.28%	6.53%
Consumer Goods: Durable
Schedule of Investments [Line Items]
% of Fair Value	1.43%	1.65%
Consumer Goods: Non-Durable
Schedule of Investments [Line Items]
% of Fair Value	2.57%	3.02%
Containers, Packaging & Glass
Schedule of Investments [Line Items]
% of Fair Value	1.25%	0.85%
Energy: Electricity
Schedule of Investments [Line Items]
% of Fair Value	1.86%	1.98%
Energy: Oil & Gas
Schedule of Investments [Line Items]
% of Fair Value	0.56%	0.58%
Environmental Industries
Schedule of Investments [Line Items]
% of Fair Value	3.79%	3.92%
Healthcare & Pharmaceuticals
Schedule of Investments [Line Items]
% of Fair Value	14.23%	13.80%
High Tech Industries
Schedule of Investments [Line Items]
% of Fair Value	9.01%	8.13%
Hotel, Gaming & Leisure
Schedule of Investments [Line Items]
% of Fair Value	0.39%	0.32%
Media: Advertising, Printing & Publishing
Schedule of Investments [Line Items]
% of Fair Value	0.69%	0.78%
Media: Broadcasting & Subscription
Schedule of Investments [Line Items]
% of Fair Value	0.14%	0.18%
Media: Diversified & Production
Schedule of Investments [Line Items]
% of Fair Value	0.21%	0.21%
Metals & Mining
Schedule of Investments [Line Items]
% of Fair Value	0.07%	0.07%
Retail
Schedule of Investments [Line Items]
% of Fair Value	0.08%	0.00%
Services: Business
Schedule of Investments [Line Items]
% of Fair Value	18.40%	18.85%
Services: Consumer
Schedule of Investments [Line Items]
% of Fair Value	4.96%	3.68%
Sovereign & Public Finance
Schedule of Investments [Line Items]
% of Fair Value	0.38%	0.42%
Telecommunications
Schedule of Investments [Line Items]
% of Fair Value	1.70%	1.93%
Transportation: Cargo
Schedule of Investments [Line Items]
% of Fair Value	1.54%	1.73%
Transportation: Consumer
Schedule of Investments [Line Items]
% of Fair Value	0.76%	1.02%
Utilities: Electric
Schedule of Investments [Line Items]
% of Fair Value	3.52%	4.03%
Utilities: Water
Schedule of Investments [Line Items]
% of Fair Value	0.84%	0.69%
Wholesale
Schedule of Investments [Line Items]
% of Fair Value	1.78%	1.94%

Nuveen Churchill Private Capital Income Fund 10-Q