Stockholders' Equity - Schedule of Reserve Share of Common Stock for Issuance (Details) - shares	Dec. 31, 2023	Dec. 31, 2022	Jul. 31, 2015
Class of Stock [Line Items]
Shares of common stock reserved for issuance (in shares)	44,753,000	49,898,000
Options outstanding
Class of Stock [Line Items]
Shares of common stock reserved for issuance (in shares)	4,243,000	5,217,000
Restricted stock units outstanding
Class of Stock [Line Items]
Shares of common stock reserved for issuance (in shares)	8,449,000	4,542,000
Sunrun-VSI 2014 Equity Incentive Plan | Employee Stock
Class of Stock [Line Items]
Shares of common stock reserved for issuance (in shares)	5,694,000	9,534,000
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)	17,830,000	20,534,000
2015 Employee Stock Purchase Plan | Employee Stock
Class of Stock [Line Items]
Shares of common stock reserved for issuance (in shares)	8,537,000	10,071,000