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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Millions | Total | Cumulative Effect, Period of Adoption, Adjustment | NRG Yield, Inc. | Common Stock | Additional Paid-In Capital | Additional Paid-In Capital NRG Yield, Inc. | Accumulated Deficit | Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment | Treasury Stock | Accumulated Other Comprehensive Loss | Noncon- trolling Interest | Noncon- trolling Interest NRG Yield, Inc.
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Adoption of new accounting standards |  | $ 1,968 | $ 15 |  | $ 4 | $ 8,376 |  | $ (6,268) | $ 15 | $ (2,386) | $ (72) | $ 2,314 |
Beginning balance at Dec. 31, 2017 |  | 1,968 | 15 |  | 4 | 8,376 |  | (6,268) | 15 | (2,386) | (72) | 2,314 |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss (income) |  | 294 |  |  |  |  |  | 268 |  |  |  | 26 |
Other comprehensive loss |  | (22) |  |  |  |  |  |  |  |  | (22) |  |
Sale of assets to NRG Yield, Inc |  |  |  | $ 16 |  |  | $ 8 |  |  |  |  |  | $ 8
Shares reissuance for ESPP |  | 2 |  |  |  | (2) |  |  |  | 4 |  |  |
Share repurchases |  | (1,250) |  |  |  |  |  |  |  | (1,250) |  |  |
Equity-based awards activity, net |  | 6 |  |  |  | 6 |  |  |  |  |  |  |
Issuance of common stock |  | 21 |  |  |  | 21 |  |  |  |  |  |  |
Common stock dividends | [1] | (37) |  |  |  |  |  | (37) |  |  |  |  |
Distributions to noncontrolling interest and dividends paid |  | (43) |  | $ (61) |  |  |  |  |  |  |  | (43) | $ (61)
Contributions from noncontrolling interests |  | 304 |  |  |  |  |  |  |  |  |  | 304 |
Adoption of new accounting standards |  | (1,234) | $ 15 |  | 4 | 8,510 |  | (6,022) | $ 15 | (3,632) | (94) | 0 |
Sale of NRG Yield and other business |  | (2,548) |  |  |  |  |  |  |  |  |  | (2,548) |
Equity component of convertible senior notes |  | 101 |  |  |  | 101 |  |  |  |  |  |  |
Ending balance at Dec. 31, 2018 |  | (1,234) |  |  | 4 | 8,510 |  | (6,022) |  | (3,632) | (94) | 0 |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Adoption of new accounting standards |  | (1,234) |  |  | 4 | 8,510 |  | (6,022) |  | (3,632) | (94) | 0 |
Net loss (income) |  | 4,438 |  |  |  |  |  | 4,438 |  |  |  |  |
Other comprehensive loss |  | (98) |  |  |  |  |  |  |  |  | (98) |  |
Shares reissuance for ESPP |  | 3 |  |  |  | 1 |  |  |  | 2 |  |  |
Share repurchases |  | (1,409) |  |  |  |  |  |  |  | (1,409) |  |  |
Equity-based awards activity, net |  | (16) |  |  |  | (16) |  |  |  |  |  |  |
Issuance of common stock |  | 6 |  |  |  | 6 |  |  |  |  |  |  |
Common stock dividends | [1] | (32) |  |  |  |  |  | (32) |  |  |  |  |
Adoption of new accounting standards |  | 1,658 |  |  | 4 | 8,501 |  | (1,616) |  | (5,039) | (192) | 0 |
Ending balance at Dec. 31, 2019 |  | 1,658 |  |  | 4 | 8,501 |  | (1,616) |  | (5,039) | (192) | 0 |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Adoption of new accounting standards |  | 1,658 |  |  | 4 | 8,501 |  | (1,616) |  | (5,039) | (192) | 0 |
Net loss (income) |  | 510 |  |  |  |  |  | 510 |  |  |  |  |
Other comprehensive loss |  | (14) |  |  |  |  |  |  |  |  | (14) |  |
Shares reissuance for ESPP |  | 4 |  |  |  |  |  |  |  | 4 |  |  |
Share repurchases |  | (197) |  |  |  |  |  |  |  | (197) |  |  |
Equity-based awards activity, net |  | (3) |  |  |  | (3) |  |  |  |  |  |  |
Issuance of common stock |  | 1 |  |  |  | 1 |  |  |  |  |  |  |
Common stock dividends | [1] | (297) |  |  |  |  |  | (297) |  |  |  |  |
Adoption of new accounting standards |  | 1,658 |  |  | 4 | 8,517 |  | (1,403) |  | (5,232) | (206) | 0 |
Repurchase of partners' equity interest in VIE |  | 18 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2020 |  | 1,680 |  |  | 4 | 8,517 |  | (1,403) |  | (5,232) | (206) | 0 |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Adoption of new accounting standards |  | $ 1,680 |  |  | $ 4 | $ 8,517 |  | $ (1,403) |  | $ (5,232) | $ (206) | $ 0 |
[1] | Dividends per common share were $1.20 for the year ended December 31, 2020 and $0.12 for each of the years ended December 31, 2019 and 2018

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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + 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 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: 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 + Details
Name: | us-gaap_TreasuryStockValueAcquiredCostMethod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration