Stock-Based Compensation - Additional Information (Details)	1 Months Ended		12 Months Ended
	Jul. 31, 2015 shares	Mar. 31, 2015 shares	Dec. 31, 2025 USD ($) purchase_period shares	Dec. 31, 2024 USD ($) shares	Dec. 31, 2023 USD ($) shares	Jun. 30, 2025 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock reserved for issuance (in shares)			63,524,000	38,345,000
Granted (in shares)			0	0	0
Total intrinsic value of options exercised | $			$ 3,900,000	$ 4,500,000	$ 10,300,000
Total fair value of options vested | $			4,300,000	6,500,000	11,800,000
Stock-based compensation expense capitalized | $			9,000,000.0	9,900,000
Total unrecognized compensation cost | $			$ 111,300,000	$ 150,600,000
Weighted-average period of recognition (in years)			2 years 4 months 24 days	2 years 4 months 24 days
Annual contribution limit | $			$ 23,500
Defined contribution expense | $			$ 20,400,000	$ 21,100,000	$ 22,700,000
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock reserved for issuance (in shares)			3,083,000	3,507,000
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock reserved for issuance (in shares)			17,299,000	12,375,000
2013 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional common stock shares reserved for issuance (in shares)		3,000,000
Shares of common stock reserved for issuance (in shares)		4,500,000
2013 Equity Incentive Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock reserved for issuance (in shares)		8,044,829
2015 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock reserved for issuance (in shares)	11,400,000
Minimum increase in stock reserved for future issuance as of first day of each fiscal year (in shares)	10,000,000
Minimum percentage of annual increase in stock reserved for future issuance as of last day of immediately preceding fiscal year	4.00%
2015 Equity Incentive Plan | Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	4 years
2015 Equity Incentive Plan | Stock Option | Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	1 year
Vesting award percentage	25.00%
2015 Equity Incentive Plan | Stock Option | Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	3 years
Vesting award percentage	75.00%
2015 Equity Incentive Plan | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	4 years
2015 Equity Incentive Plan | Restricted Stock Units | Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	1 year
Vesting award percentage	25.00%
2015 Equity Incentive Plan | Restricted Stock Units | Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	3 years
Vesting award percentage	75.00%
2015 Equity Incentive Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock reserved for issuance (in shares)	15,439,334
2015 Equity Incentive Plan | Maximum | Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted, expiration period (in years)	10 years
2015 Amended and Restated Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock authorized (in shares)						38,223,498
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock reserved for issuance (in shares)			1,000,000
Minimum percentage of annual increase in stock reserved for future issuance as of last day of immediately preceding fiscal year			2.00%
Offering period (in months)			24 months
Number of purchase periods (in months) | purchase_period			4
Purchase period (in months)			6 months
Maximum percentage in payroll deductions to acquire shares of common stock			15.00%
Maximum deductible fair market value of shares available for employee to purchase per calendar year | $			$ 25,000
Maximum number of shares available for employee to purchase per offering period (in shares)			10,000
Maximum annual shares reserved for issuance (in shares)			5,000,000
Sunrun 401 (k) | First threshold
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer matching contribution, percentage			100.00%
Percent of pay matched			1.00%
Sunrun 401 (k) | Second threshold
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer matching contribution, percentage			50.00%
Percent of pay matched			6.00%
Vivint Solar 401 (k)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer matching contribution, percentage			33.00%
Percent of pay matched			6.00%
Long-term Incentive Plan 2013 | Restricted Stock Units | Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting award percentage			33.33%
Long-term Incentive Plan 2013 | Restricted Stock Units | Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting award percentage			33.33%
Long-term Incentive Plan 2013 | Restricted Stock Units | Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting award percentage			33.33%