XML 80 R45.htm IDEA: XBRL DOCUMENT
v3.19.3

Nature of Business and Basis of Presentation - General (Details) MW in Thousands | Sep. 30, 2019 MW
--- | ---
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Generation capacity (in MW) | 23

X
- Definition The generation capacity of the entity's power generation facilities as of the balance sheet date, expressed in megawatts. + References No definition available. + Details
Name: | nrg_PowerGenerationCapacityMegawatts
Namespace Prefix: | nrg_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration