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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

X

- 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