Redeemable Noncontrolling Interests and Equity (Details) - fund	Sep. 30, 2020	Dec. 31, 2019
Equity [Abstract]
Number of funds, carrying value adjusted to redemption value	10	9

Number of Funds, Carrying Value Adjusted to Redemption Value

No definition available.

Name:	run_NumberofFundsCarryingValueAdjustedtoRedemptionValue
Namespace Prefix:	run_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant