Stockholders' Equity - Schedule of Reserve Share of Common Stock for Issuance (Details) - shares	Dec. 31, 2024	Dec. 31, 2023	Jul. 31, 2015
Class of Stock [Line Items]
Shares of common stock reserved for issuance (in shares)	38,345,000	44,753,000
Options outstanding
Class of Stock [Line Items]
Shares of common stock reserved for issuance (in shares)	3,507,000	4,243,000
Restricted stock units outstanding
Class of Stock [Line Items]
Shares of common stock reserved for issuance (in shares)	12,375,000	8,449,000
Sunrun-VSI 2014 Equity Incentive Plan | Employee Stock
Class of Stock [Line Items]
Shares of common stock reserved for issuance (in shares)	0	5,694,000
2015 Equity Incentive Plan
Class of Stock [Line Items]
Shares of common stock reserved for issuance (in shares)			11,400,000
2015 Equity Incentive Plan | Employee Stock
Class of Stock [Line Items]
Shares of common stock reserved for issuance (in shares)	15,595,000	17,830,000
2015 Employee Stock Purchase Plan | Employee Stock
Class of Stock [Line Items]
Shares of common stock reserved for issuance (in shares)	6,868,000	8,537,000