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CONSOLIDATED STATEMENT OF STOCKHOLDER'S EQUITY - USD ($) $ in Millions | Total | Common Stock | Additional Paid-In Capital | Retained Earnings/ (Accumu-lated Deficit) | Treasury Stock | Accumulated Other Comprehensive Income/(Loss) | Noncon- trolling Interest | NRG Yield | NRG Yield, Inc. | NRG Yield, Inc. Noncon- trolling Interest
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2014 | $ 11,676 | $ 4 | $ 8,327 | $ 3,588 | $ (1,983) | $ (174) | $ 1,914 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |
Net loss | (6,419) |  |  | (6,382) |  |  | (37) |  |  |
Other comprehensive income (loss) | 1 |  |  |  |  | 1 |  |  |  |
Other comprehensive income (loss) portion attributable to noncontrolling interest |  |  |  |  |  |  | (4) |  |  |
Other comprehensive income (loss), including OCI for NCI | (3) |  |  |  |  |  |  |  |  |
Sale of assets to NRG Yield, Inc. |  |  | (56) |  |  |  | 83 | $ 27 |  |
ESPP share purchases | 6 |  | (1) |  | 7 |  |  |  |  |
Equity-based compensation | 24 |  | 26 | (2) |  |  |  |  |  |
Purchase of treasury stock | (437) |  |  |  | (437) |  |  |  |  |
Common stock dividends | (191) |  |  | (191) |  |  |  |  |  |
Preferred stock dividends | (20) |  |  | (20) |  |  |  |  |  |
Distributions to redeemable noncontrolling interest | (159) |  |  |  |  |  | (159) |  |  |
Gain on redemption of preferred shares | 0 |  |  |  |  |  |  |  |  |
Contributions from noncontrolling interests | 234 |  |  |  |  |  | 234 |  |  |
Acquisition of noncontrolling interests by NRG Yield, Inc. |  |  |  |  |  |  | 74 | 74 |  |
Impact of NRG Yield, Inc. public offering | 599 |  |  |  |  |  | 599 |  |  |
Equity component of NRG Yield, Inc. convertible notes | 23 |  |  |  |  |  | 23 |  |  |
Balance at Dec. 31, 2015 | 5,434 | 4 | 8,296 | (3,007) | (2,413) | (173) | 2,727 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |
Net loss | (853) |  |  | (774) |  |  | (79) |  |  |
Other comprehensive income (loss) | 38 |  |  |  |  | 38 |  |  |  |
Other comprehensive income (loss), including OCI for NCI | 38 |  |  |  |  |  |  |  |  |
Sale of assets to NRG Yield, Inc. |  |  | 59 |  |  |  | (16) | 43 |  |
ESPP share purchases | 6 |  | (2) | (6) | 14 |  |  |  |  |
Equity-based compensation | 6 |  | 5 | 1 |  |  |  |  |  |
Common stock dividends | (74) |  |  | (74) |  |  |  |  |  |
Preferred stock dividends | (5) |  |  | (5) |  |  |  |  |  |
Distributions to redeemable noncontrolling interest | (158) |  |  |  |  |  | (158) |  | $ (92) | $ (92)
Gain on redemption of preferred shares | 78 |  |  | 78 |  |  |  |  |  |
Contributions from noncontrolling interests | 30 |  |  |  |  |  | 30 |  |  |
Redemption of noncontrolling interests | (7) |  |  |  |  |  | (7) |  |  |
Balance at Dec. 31, 2016 | 4,446 | 4 | 8,358 | (3,787) | (2,399) | (135) | 2,405 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |
Net loss | (2,251) |  |  | (2,153) |  |  | (98) |  |  |
Other comprehensive income (loss) | 63 |  |  |  |  | 51 |  |  |  |
Other comprehensive income (loss), including OCI for NCI | 51 |  |  |  |  |  |  |  |  |
Sale of assets to NRG Yield, Inc. |  |  | (25) |  |  |  | 20 | $ (5) |  |
ESPP share purchases | 6 |  | (3) | (4) | 13 |  |  |  |  |
Equity-based compensation | 29 |  | 29 |  |  |  |  |  |  |
Common stock dividends | (38) |  |  | (38) |  |  |  |  |  |
Distributions to redeemable noncontrolling interest | (65) |  |  |  |  |  | (65) |  | $ (108) | $ (108)
Gain on redemption of preferred shares | 0 |  |  |  |  |  |  |  |  |
Contributions from noncontrolling interests | 160 |  |  |  |  |  | 160 |  |  |
Cumulative effect adjustment | (257) |  | 17 | (286) |  | 12 |  |  |  |
Balance at Dec. 31, 2017 | $ 1,968 | $ 4 | $ 8,376 | $ (6,268) | $ (2,386) | $ (72) | $ 2,314 |  |  |

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