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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Millions | Total | NRG Yield, Inc. | Common Stock | Additional Paid-In Capital | Accumulated Deficit | Treasury Stock | Accumulated Other Comprehensive Loss | Noncontrolling Interest | Noncontrolling Interest NRG Yield, Inc.
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2017 |  | $ 1,968 |  | $ 4 | $ 8,376 | $ (6,268) | $ (2,386) | $ (72) | $ 2,314 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net income/(loss) |  | 249 |  |  |  | 279 |  |  | (30) |
Other comprehensive (loss) income |  | 11 |  |  |  |  |  | 11 |  |
Sale of assets to NRG Yield, Inc. |  | 12 |  |  | 8 |  |  |  | 4 |
ESPP share purchases |  | 3 |  |  | (2) |  | 5 |  |  |
Share repurchases |  | (93) |  |  |  |  | (93) |  |  |
Equity-based compensation |  | (10) |  |  | (10) |  |  |  |  |
Issuance of common stock |  | 7 |  |  | 7 |  |  |  |  |
Common stock dividends | [1] | (10) |  |  |  | (10) |  |  |  |
Distributions to noncontrolling interest and dividends paid |  | (19) | $ (30) |  |  |  |  |  | (19) | $ (30)
Contributions from noncontrolling interests |  | 153 |  |  |  |  |  |  | 153 |
Adoption of new accounting standards |  | 17 |  |  |  | 17 |  |  |  |
Ending balance at Mar. 31, 2018 |  | 2,258 |  | 4 | 8,379 | (5,982) | (2,474) | (61) | 2,392 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net income/(loss) |  | 104 |  |  |  | 72 |  |  | 32 |
Other comprehensive (loss) income |  | 1 |  |  |  |  |  | 1 |  |
Sale of assets to NRG Yield, Inc. |  | (2) |  |  |  |  |  |  | (2) |
ESPP share purchases |  | 1 |  |  |  |  | 1 |  |  |
Share repurchases |  | (407) |  |  | (11) |  | (396) |  |  |
Equity-based compensation |  | 8 |  |  | 8 |  |  |  |  |
Issuance of common stock |  | 4 |  |  | 4 |  |  |  |  |
Common stock dividends | [1] | (9) |  |  |  | (9) |  |  |  |
Distributions to noncontrolling interest and dividends paid |  | (15) | $ (31) |  |  |  |  |  | (15) | $ (31)
Contributions from noncontrolling interests |  | 150 |  |  |  |  |  |  | 150 |
Adoption of new accounting standards |  | (1) |  |  |  | (1) |  |  |  |
Deconsolidation of Business |  | (89) |  |  |  |  |  |  | (89) |
Equity component of convertible senior notes |  | 101 |  |  | 101 |  |  |  |  |
Ending balance at Jun. 30, 2018 |  | 2,071 |  | 4 | 8,481 | (5,920) | (2,871) | (60) | 2,437 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net income/(loss) |  | (48) |  |  |  | (72) |  |  | 24 |
Other comprehensive (loss) income |  | 2 |  |  |  |  |  | 2 |  |
Sale of assets to NRG Yield, Inc. |  | 7 |  |  | 1 |  |  |  | 6 |
Share repurchases |  | (500) |  |  | (37) |  | (463) |  |  |
Equity-based compensation |  | 4 |  |  | 4 |  |  |  |  |
Issuance of common stock |  | 4 |  |  | 4 |  |  |  |  |
Common stock dividends | [1] | (9) |  |  |  | (9) |  |  |  |
Distributions to noncontrolling interest and dividends paid |  | (9) |  |  |  |  |  |  | (9) |
Contributions from noncontrolling interests |  | 1 |  |  |  |  |  |  | 1 |
Deconsolidation of Business |  | (2,459) |  |  |  |  |  |  | (2,459) |
Ending balance at Sep. 30, 2018 |  | (936) |  | 4 | 8,453 | (6,001) | (3,334) | (58) | $ 0 |
Beginning balance at Dec. 31, 2018 |  | (1,234) |  | 4 | 8,510 | (6,022) | (3,632) | (94) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net income/(loss) |  | 482 |  |  |  | 482 |  |  |  |
Other comprehensive (loss) income |  | (2) |  |  |  |  |  | (2) |  |
Share repurchases |  | (749) |  |  | (10) |  | (739) |  |  |
Equity-based compensation |  | (32) |  |  | (32) |  |  |  |  |
Issuance of common stock |  | 5 |  |  | 5 |  |  |  |  |
Common stock dividends | [2] | (8) |  |  |  | (8) |  |  |  |
Ending balance at Mar. 31, 2019 |  | (1,538) |  | 4 | 8,473 | (5,548) | (4,371) | (96) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net income/(loss) |  | 201 |  |  |  | 201 |  |  |  |
Other comprehensive (loss) income |  | (3) |  |  |  |  |  | (3) |  |
Share repurchases |  | (305) |  |  | 10 |  | (315) |  |  |
Equity-based compensation |  | 5 |  |  | 5 |  |  |  |  |
Common stock dividends | [2] | (8) |  |  |  | (8) |  |  |  |
Ending balance at Jun. 30, 2019 |  | (1,648) |  | 4 | 8,488 | (5,355) | (4,686) | (99) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net income/(loss) |  | 372 |  |  |  | 372 |  |  |  |
Other comprehensive (loss) income |  | (59) |  |  |  |  |  | (59) |  |
Share repurchases |  | (234) |  |  |  |  | (234) |  |  |
Equity-based compensation |  | 5 |  |  | 5 |  |  |  |  |
Issuance of common stock |  | 1 |  |  | 1 |  |  |  |  |
Common stock dividends | [2] | (8) |  |  |  | (8) |  |  |  |
Ending balance at Sep. 30, 2019 |  | $ (1,571) |  | $ 4 | $ 8,494 | $ (4,991) | $ (4,920) | $ (158) |  |
[1] | Dividends per common share were $0.03 for each of the quarters ended September 30, 2018, June 30, 2018 and March 31, 2018
[2] | Dividends per common share were $0.03 for each of the quarters ended September 30, 2019, June 30, 2019 and March 31, 2019

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