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v3.20.1

Changes in Capital Structure - Changes in NRG's common stock issued and outstanding (Details) - shares | 1 Months Ended | 3 Months Ended | 4 Months Ended
--- | --- | --- | ---
May 07, 2020 | Apr. 30, 2020 | Mar. 31, 2020 | May 07, 2020
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |
Balance as of beginning of period (in shares) | 422,979,893 | 422,979,893 | 421,890,790 | 421,890,790
Treasury shares, balance as of beginning of period (in shares) | (177,356,039) | (177,356,039) | (172,894,601) | (172,894,601)
Outstanding, as of beginning of period (in shares) | 245,623,854 | 245,623,854 | 248,996,189 | 248,996,189
Shares issued under LTIPs (in shares) |  |  | 1,089,103 |
Shares repurchased (in shares) |  |  | (4,461,438) |
Balance as of end of period (in shares) |  |  | 422,979,893 |
Treasury shares, balance as of end of the period (in shares) |  |  | (177,356,039) |
Outstanding, as of end of period (in shares) |  |  | 245,623,854 |
Subsequent Event |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |
Shares issued under LTIPs (in shares) | 1,096 |  |  |
Stock issued under ESPP (in shares) |  | 63,455 |  |
Shares repurchased (in shares) | (1,601,345) |  |  |
Outstanding, as of end of period (in shares) | 244,087,060 |  |  | 244,087,060
Common Stock |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |
Balance as of beginning of period (in shares) | 422,979,893 | 422,979,893 | 421,890,790 | 421,890,790
Shares issued under LTIPs (in shares) |  |  | 1,089,103 |
Shares repurchased (in shares) |  |  | 0 |
Balance as of end of period (in shares) |  |  | 422,979,893 |
Common Stock | Subsequent Event |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |
Shares issued under LTIPs (in shares) | 1,096 |  |  |
Shares repurchased (in shares) | 0 |  |  |
Balance as of end of period (in shares) | 422,980,989 |  |  | 422,980,989
Treasury |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |
Treasury shares, balance as of beginning of period (in shares) | (177,356,039) | (177,356,039) | (172,894,601) | (172,894,601)
Shares issued under LTIPs (in shares) |  |  | 0 |
Shares repurchased (in shares) |  |  | (4,461,438) |
Treasury shares, balance as of end of the period (in shares) |  |  | (177,356,039) |
Treasury | Subsequent Event |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |
Shares issued under LTIPs (in shares) | 0 |  |  |
Shares repurchased (in shares) | (1,601,345) |  |  |
Treasury shares, balance as of end of the period (in shares) | (178,893,929) |  |  | (178,893,929)
Capital Allocation Plan |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |
Shares repurchased (in shares) |  |  | (5,171,501) |
Capital Allocation Plan | Subsequent Event |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |
Shares repurchased (in shares) | (1,601,345) |  |  | (6,772,846)
ESPP | Subsequent Event |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |
Stock issued under ESPP (in shares) | 63,455 |  |  |
ESPP | Common Stock | Subsequent Event |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |
Stock issued under ESPP (in shares) | 0 |  |  |
ESPP | Treasury | Subsequent Event |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |
Stock issued under ESPP (in shares) | 63,455 |  |  |

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + 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=6877327&loc=d3e13212-122682 + Details
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