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Stock-Based Compensation - Additional Information (Details)	1 Months Ended				12 Months Ended
	Jul. 31, 2019 shares	Jul. 31, 2015 shares	Mar. 31, 2015 shares	Sep. 30, 2014	Dec. 31, 2021 USD ($) tranche purchase_period planPool grantee $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares	Aug. 31, 2014 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)					55,467,000	47,311,000
Unvested options exercisable (in shares)					0	0
Weighted-average grant-date fair value of stock options granted (in usd per share) \| $ / shares					$ 27.72	$ 9.33	$ 8.27
Total intrinsic value of options exercised \| $					$ 106,100,000	$ 251,700,000	$ 37,800,000
Total fair value of options vested \| $					$ 36,400,000	104,800,000	9,500,000
Warrants issued (in shares)					846,943
Warrant, exercise price (in dollars per share) \| $ / shares					$ 0.01
Number of warrants exercised (in shares)					69,309
Compensation expense recognized \| $					$ 211,000,000	170,587,000	26,306,000
Total unrecognized compensation cost \| $					$ 175,800,000	280,100,000
Weighted-average period of recognition					2 years 3 months 18 days
Share-based compensation expense due to accelerated vesting \| $					$ 35,700,000
Number of grantees \| grantee					53
Annual contribution limit \| $					$ 19,500
Defined contribution expense \| $					14,700,000	9,600,000	$ 8,500,000
Stock-based compensation expense capitalized \| $					$ 10,900,000	$ 6,500,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)					4,485,000	7,103,000
Stock option plan, number of shares granted (in shares)					1,992,000	5,295,000
Outstanding stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)					6,257,000	8,019,000
Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense recognized \| $					$ 10,700,000
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
Common stock reserved for issuance (in shares)			4,500,000
Award vesting period			4 years
2013 Equity Incentive Plan \| Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			1 year
Vesting award percentage			25.00%
2013 Equity Incentive Plan \| Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			3 years
Vesting award percentage			75.00%
2013 Equity Incentive Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)			8,044,829
Stock options granted, expiration period			10 years
2014 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)		1,197,342						947,342
2014 Equity Incentive Plan \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option plan, number of shares granted (in shares)		1,197,342
Sunrun - VSI 2014 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for grant (in shares)					11,100,000
2013 Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted, expiration period				10 years
Long-term Incentive Plan 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for grant (in shares)					0
Long-term Incentive Plan 2013 \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of long-term incentive plan pools \| planPool					6
Shares awarded (in shares)	1,500,000
Number of tranches \| tranche					3
Long-term Incentive Plan 2013 \| Tranche One \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					30 days
Vesting award percentage					33.33%
Long-term Incentive Plan 2013 \| Tranche Two \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					9 months
Vesting award percentage					33.33%
Long-term Incentive Plan 2013 \| Tranche Three \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					18 months
Vesting award percentage					33.33%
2015 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)		11,400,000
Minimum annual automatic increase included in common stock reserved for future issuance as of first day of each fiscal year (in shares)		10,000,000
Minimum percentage of annual automatic increase included in common stock reserved for future issuance as of last day of immediately preceding fiscal year		4.00%
Additional common stock shares reserved for issuance (in shares)					8,056,251	4,738,048
2015 Equity Incentive Plan \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		4 years
2015 Equity Incentive Plan \| Outstanding stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		4 years
2015 Equity Incentive Plan \| Tranche One \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		1 year
Vesting award percentage		25.00%
2015 Equity Incentive Plan \| Tranche One \| Outstanding stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		1 year
Vesting award percentage		25.00%
2015 Equity Incentive Plan \| Tranche Two \| Outstanding stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		3 years
Vesting award percentage		75.00%
2015 Equity Incentive Plan \| Tranche Three \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		3 years
Vesting award percentage		75.00%
2015 Equity Incentive Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)		15,439,334
2015 Equity Incentive Plan \| Maximum \| Outstanding stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted, expiration period		10 years
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)					1,000,000
Minimum percentage of annual automatic increase included in common stock reserved for future issuance as of last day of immediately preceding fiscal year					2.00%
Additional common stock shares reserved for issuance (in shares)					4,028,125	2,369,024
Offering period					24 months
Number of purchase periods \| purchase_period					4
Purchase period					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					5.00%
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%