Debt - Solar Asset-backed Notes - Additional Information (Detail) $ in Millions	Dec. 31, 2019 USD ($)
SolarCity [Member] \| Non-recourse debt [Member] \| Solar asset-backed notes [Member]
Debt Instrument [Line Items]
Collateral value of solar assets	$ 690

Amount of assets pledged to secure a debt instrument.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Name:	us-gaap_DebtInstrumentCollateralAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant