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CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Millions, $ in Millions | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Retained Earnings [Member] | Total Common Shareholders' Equity Parent [Member] | Noncontrolling Interest [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance (in shares) at Dec. 31, 2016 |  |  |  | 468 |  |  |  |  |  |  |  |
Beginning Balance at Dec. 31, 2016 |  | $ 25,331 |  | $ 5 | $ 8,948 | $ (70) |  | $ 15,458 | $ 24,341 |  | $ 990 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Net Income (loss) |  | 3,252 | [1],[2] |  |  |  |  | 3,223 | 3,223 |  | 29 |
Issuances of common stock, net of issuance cost of less than $1 (in shares) |  |  |  | 2 |  |  |  |  |  |  |  |
Issuances of common stock, net of issuance cost of less than $1 |  |  |  |  | 24 |  |  |  | 24 |  |  |
Share-based payment activity |  |  |  |  | 77 |  |  |  | 77 |  |  |
Dividends on common stock |  |  |  |  |  |  |  | (1,382) | (1,382) |  |  |
Other comprehensive income |  | 129 |  |  |  | 118 |  |  | 118 |  | 11 |
Sale of NEER assets to NEP |  |  |  |  |  |  |  |  |  |  | (17) |
Other |  |  |  |  | (3) |  |  |  | (3) |  | (90) |
Ending Balance (in shares) at Sep. 30, 2017 |  |  |  | 470 |  |  |  |  |  |  |  |
Ending Balance at Sep. 30, 2017 |  | $ 27,321 |  | $ 5 | 9,046 | 48 |  | 17,299 | 26,398 |  | 923 |
Beginning Balance (in shares) at Dec. 31, 2017 |  | 471 |  | 471 |  |  |  |  |  |  |  |
Beginning Balance at Dec. 31, 2017 |  | $ 29,498 |  | $ 5 | 9,100 | 111 |  | 18,992 | 28,208 |  | 1,290 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Net Income (loss) |  | 5,475 |  |  |  |  |  | 6,229 | 6,229 |  | (754) |
Issuances of common stock, net of issuance cost of less than $1 (in shares) |  |  |  | 6 |  |  |  |  |  |  |  |
Issuances of common stock, net of issuance cost of less than $1 |  |  |  |  | 700 |  |  |  | 700 |  |  |
Share-based payment activity (in shares) |  |  |  | 1 |  |  |  |  |  |  |  |
Share-based payment activity |  |  |  |  | 82 |  |  |  | 82 |  |  |
Dividends on common stock |  |  |  |  |  |  |  | (1,570) | (1,570) |  |  |
Other comprehensive income |  | 1 |  |  |  | 1 |  |  | 1 |  |  |
Impact of NEP deconsolidation |  | $ (2,700) |  |  |  | 58 | [3] |  | 58 | [3] | (2,695) | [3]
Adoption of accounting standards updates | [4] |  |  |  | 593 | (328) |  | 285 | 550 |  | 5,303 |
Other |  |  |  |  | (5) |  |  | (1) | (6) |  | (58) |
Ending Balance (in shares) at Sep. 30, 2018 |  | 478 |  | 478 |  |  |  |  |  |  |  |
Ending Balance at Sep. 30, 2018 |  | $ 37,338 |  | $ 5 | $ 10,470 | $ (158) |  | $ 23,935 | $ 34,252 |  | $ 3,086 |
[1] | Prior period amounts have been retrospectively adjusted as discussed in Note 11 - Restricted Cash.
[2] | Prior period amounts have been retrospectively adjusted as discussed in Note 3 - Amendments to Presentation of Retirement Benefits.
[3] | See Note 2.
[4] | See Notes 1, 5 - Financial Instruments Accounting Standards Update, 6 and 11 - Accounting for Partial Sales of Nonfinancial Assets.

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