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v3.20.2

Changes in Capital Structure - Narrative (Details) - shares | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2019 | Sep. 30, 2020
Equity [Abstract] |  |  |
Common stock, shares authorized (in shares) |  | 500,000,000 | 500,000,000
Long-term capital allocation, target allocation, cash generated allocated to growth investments, percentage |  | 50.00% |
Long-term capital allocation, target allocation, cash generated allocated returned to shareholders, percentage |  | 50.00% |
Employee Stock Purchase Plan, minimum percentage of eligible compensation to purchase shares | 1.00% |  |
Employee Stock Purchase Plan, maximum percentage of eligible compensation | 10.00% |  |
Employee Stock Purchase Plan, exercise price as percentage of fair value | 95.00% |  |

X
- Definition This element represents the exercise price under employee stock purchase plan as a percentage of fair value. + References No definition available. + Details
Name: | nrg_EmployeeStockPurchasePlanExercisePriceAsPercentageOfFairValue
Namespace Prefix: | nrg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the maximum percentage of eligible compensation, which can be withheld by employees to purchase shares of the entity. + References No definition available. + Details
Name: | nrg_EmployeeStockPurchasePlanMaximumPercentageOfCompensationEligible
Namespace Prefix: | nrg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Employee Stock Purchase Plan, Minimum Percentage of Compensation Eligible + References No definition available. + Details
Name: | nrg_EmployeeStockPurchasePlanMinimumPercentageofCompensationEligible
Namespace Prefix: | nrg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Long-term Capital Allocation, Target Allocation, Cash Generated Allocated Returned to Shareholders, Percentage + References No definition available. + Details
Name: | nrg_LongTermCapitalAllocationTargetAllocationCashGeneratedAllocatedReturnedToShareholdersPercentage
Namespace Prefix: | nrg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Long-term Capital Allocation, Target Allocation, Cash Generated Allocated to Growth Investments, Percentage + References No definition available. + Details
Name: | nrg_LongTermCapitalAllocationTargetAllocationCashGeneratedAllocatedToGrowthInvestmentsPercentage
Namespace Prefix: | nrg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_CommonStockSharesAuthorized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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