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v3.19.1

Changes in Capital Structure - Changes in NRG's common shares outstanding and issued (Details) - shares |  | 3 Months Ended
--- | --- | ---
May 02, 2019 | Mar. 31, 2019
Schedule of Stock by Class, Equity [Roll Forward] |  |
Balance as of beginning of period (in shares) |  | 420,288,886
Treasury shares, balance as of beginning of period (in shares) |  | (136,638,847)
Outstanding, as of beginning of period (in shares) |  | 283,650,039
Shares issued under LTIPs (in shares) |  | 1,497,175
Shares repurchased (in shares) |  | (17,608,957)
Balance as of end of period (in shares) |  | 421,786,061
Treasury shares, balance as of end of the period (in shares) |  | (154,247,804)
Outstanding, as of end of period (in shares) |  | 267,538,257
Issued |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |
Shares issued under LTIPs (in shares) |  | 1,497,175
Shares repurchased (in shares) |  | 0
Treasury |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |
Shares issued under LTIPs (in shares) |  | 0
Shares repurchased (in shares) |  | (17,608,957)
Capital Allocation Plan |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |
Shares repurchased (in shares) |  | (17,608,957)
Capital Allocation Plan | Subsequent Event |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |
Shares repurchased (in shares) | (17,999,865) |

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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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- Definition Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: 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=27012166&loc=d3e187085-122770 Reference 3: 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: 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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