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Changes in Capital Structure - NRG Common Stock Dividends (Details) - $ / shares		3 Months Ended		12 Months Ended
	Apr. 15, 2021	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Subsequent Event [Line Items]
Common stock dividends proposed annual amount (in usd per share)		$ 1.20		$ 1.30
Dividends per common share (in usd per share)		$ 0.325	$ 0.30
Subsequent Event
Subsequent Event [Line Items]
Common stock dividends declared (in usd per share)	$ 0.325
Minimum
Subsequent Event [Line Items]
Common stock, annual dividend growth rate, percentage		700.00%
Maximum
Subsequent Event [Line Items]
Common stock, annual dividend growth rate, percentage		9.00%

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- Definition

Common Stock, Annual Dividend Growth Rate

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- Definition

Common Stock, Dividends, Proposed Annual Amount, Per Share

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- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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