Organization and Basis of Presentation - Additional Information (Details) - USD ($)			3 Months Ended
	Jan. 14, 2019	Aug. 18, 2017	Mar. 31, 2025
Organization and Basis of Presentation Disclosure [Line Items]
Extended term for successive periods of subscription agreements			1 year
Commitment period description			The Commitment Period commenced on April 13, 2018 (the “Initial Closing Date”), the day on which the Company completed the first closing of the sale of its Units to persons not affiliated with the Adviser and ended on May 16, 2021, which is the later of (a) April 13, 2021, three years from the Initial Closing Date and (b) May 16, 2021, three years from the date in which the Company first completed an investment.
Significantly investment completion period upon expiration of commitment period			90 days
Recallable amount			$ 489,114,000
Percentage of existing portfolio companies aggregate amount not to exceed an amount equal to aggregate cumulative invested or committed			10.00%
Maximum
Organization and Basis of Presentation Disclosure [Line Items]
Percentage of aggregate cumulative invested amount in existing portfolio companies			10.00%
Common Units
Organization and Basis of Presentation Disclosure [Line Items]
Number of units sold and issued	13,734,010	10
Aggregate purchase price	$ 1,373,401,000		$ 1,000
Shares issued price per unit			$ 100
Common Units \| Minimum
Organization and Basis of Presentation Disclosure [Line Items]
Number of business days			10 days

TCW Direct Lending VII LLC 10-Q