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Consolidated Statement of Equity/Shareholder's Equity (Unaudited) - USD ($) shares in Millions, $ in Millions | Total | Common Stock | Additional Paid-In Capital | Retained Earnings | Treasury Stock | Capital Stock Expense | Accumulated Other Comprehensive Income/(Loss) | Non- controlling Interest | CECONY | CECONY Common Stock | CECONY Additional Paid-In Capital | CECONY Retained Earnings | CECONY Repurchased Con Edison Stock | CECONY Capital Stock Expense | CECONY Accumulated Other Comprehensive Income/(Loss)
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Beginning Balance (shares) at Dec. 31, 2018 |  | 321 |  |  | 23 |  |  |  |  |  |  |  |  |  |
Beginning Balance (shares) at Dec. 31, 2018 |  |  |  |  |  |  |  |  |  | 235 |  |  |  |  |
Beginning Balance at Dec. 31, 2018 | $ 16,839 | $ 34 | $ 7,117 | $ 10,728 | $ (1,038) | $ (99) | $ (16) | $ 113 |  |  |  |  |  |  |
Beginning Balance at Dec. 31, 2018 |  |  |  |  |  |  |  |  | $ 12,910 | $ 589 | $ 4,769 | $ 8,581 | $ (962) | $ (62) | $ (5)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 445 |  |  | 424 |  |  |  | 21 |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 412 |  |  | 412 |  |  |
Common stock dividends | (237) |  |  | (237) |  |  |  |  | (228) |  |  | (228) |  |  |
Issuance of common shares – public offering (shares) |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares - public offering | 425 |  | 433 |  |  | (8) |  |  |  |  |  |  |  |  |
Issuance of common shares for stock plans | 27 |  | 27 |  |  |  |  |  |  |  |  |  |  |  |
Capital contribution by parent |  |  |  |  |  |  |  |  | 225 |  | 225 |  |  |  |
Other comprehensive income | 4 |  |  |  |  |  | 4 |  | 0 |  |  |  |  |  |
Distributions to noncontrolling interest | (2) |  |  |  |  |  |  | (2) |  |  |  |  |  |  |
Ending Balance (shares) at Mar. 31, 2019 |  | 327 |  |  | 23 |  |  |  |  |  |  |  |  |  |
Ending Balance (shares) at Mar. 31, 2019 |  |  |  |  |  |  |  |  |  | 235 |  |  |  |  |
Ending Balance at Mar. 31, 2019 | 17,501 | $ 34 | 7,577 | 10,915 | $ (1,038) | (107) | (12) | 132 |  |  |  |  |  |  |
Ending Balance at Mar. 31, 2019 |  |  |  |  |  |  |  |  | 13,319 | $ 589 | 4,994 | 8,765 | (962) | (62) | (5)
Beginning Balance (shares) at Dec. 31, 2018 |  | 321 |  |  | 23 |  |  |  |  |  |  |  |  |  |
Beginning Balance (shares) at Dec. 31, 2018 |  |  |  |  |  |  |  |  |  | 235 |  |  |  |  |
Beginning Balance at Dec. 31, 2018 | 16,839 | $ 34 | 7,117 | 10,728 | $ (1,038) | (99) | (16) | 113 |  |  |  |  |  |  |
Beginning Balance at Dec. 31, 2018 |  |  |  |  |  |  |  |  | 12,910 | $ 589 | 4,769 | 8,581 | (962) | (62) | (5)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 1,127 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 1,048 |  |  |  |  |  |  |  | 978 |  |  |  |  |  |
Other comprehensive income | 6 |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Ending Balance (shares) at Sep. 30, 2019 |  | 332 |  |  | 23 |  |  |  |  |  |  |  |  |  |
Ending Balance (shares) at Sep. 30, 2019 |  |  |  |  |  |  |  |  |  | 235 |  |  |  |  |
Ending Balance at Sep. 30, 2019 | 18,134 | $ 35 | 8,031 | 11,051 | $ (1,038) | (110) | (10) | 175 |  |  |  |  |  |  |
Ending Balance at Sep. 30, 2019 |  |  |  |  |  |  |  |  | 14,079 | $ 589 | 5,644 | 8,874 | (962) | (62) | (4)
Beginning Balance (shares) at Mar. 31, 2019 |  | 327 |  |  | 23 |  |  |  |  |  |  |  |  |  |
Beginning Balance (shares) at Mar. 31, 2019 |  |  |  |  |  |  |  |  |  | 235 |  |  |  |  |
Beginning Balance at Mar. 31, 2019 | 17,501 | $ 34 | 7,577 | 10,915 | $ (1,038) | (107) | (12) | 132 |  |  |  |  |  |  |
Beginning Balance at Mar. 31, 2019 |  |  |  |  |  |  |  |  | 13,319 | $ 589 | 4,994 | 8,765 | (962) | (62) | (5)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 179 |  |  | 152 |  |  |  | 27 |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 152 |  |  | 152 |  |  |
Common stock dividends | (242) |  |  | (242) |  |  |  |  | (228) |  |  | (228) |  |  |
Issuance of common shares – public offering (shares) |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares - public offering | 400 | $ 1 | 402 |  |  | (3) |  |  |  |  |  |  |  |  |
Issuance of common shares for stock plans | 29 |  | 29 |  |  |  |  |  |  |  |  |  |  |  |
Capital contribution by parent |  |  |  |  |  |  |  |  | 625 |  | 625 |  |  |  |
Other comprehensive income | 1 |  |  |  |  |  | 1 |  | 0 |  |  |  |  |  |
Distributions to noncontrolling interest | (3) |  |  |  |  |  |  | (3) |  |  |  |  |  |  |
Ending Balance (shares) at Jun. 30, 2019 |  | 332 |  |  | 23 |  |  |  |  |  |  |  |  |  |
Ending Balance (shares) at Jun. 30, 2019 |  |  |  |  |  |  |  |  |  | 235 |  |  |  |  |
Ending Balance at Jun. 30, 2019 | 17,865 | $ 35 | 8,008 | 10,825 | $ (1,038) | (110) | (11) | 156 |  |  |  |  |  |  |
Ending Balance at Jun. 30, 2019 |  |  |  |  |  |  |  |  | 13,868 | $ 589 | 5,619 | 8,689 | (962) | (62) | (5)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 503 |  |  | 473 |  |  |  | 30 |  |  |  |  |  |  |
Net income | 473 |  |  |  |  |  |  |  | 414 |  |  | 414 |  |  |
Common stock dividends | (247) |  |  | (247) |  |  |  |  | (229) |  |  | (229) |  |  |
Issuance of common shares – public offering (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares - public offering | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares for stock plans | 23 |  | 23 |  |  |  |  |  |  |  |  |  |  |  |
Capital contribution by parent |  |  |  |  |  |  |  |  | 25 |  | 25 |  |  |  |
Other comprehensive income | 1 |  |  |  |  |  | 1 |  | 1 |  |  |  |  |  | 1
Distributions to noncontrolling interest | (11) |  |  |  |  |  |  | (11) |  |  |  |  |  |  |
Ending Balance (shares) at Sep. 30, 2019 |  | 332 |  |  | 23 |  |  |  |  |  |  |  |  |  |
Ending Balance (shares) at Sep. 30, 2019 |  |  |  |  |  |  |  |  |  | 235 |  |  |  |  |
Ending Balance at Sep. 30, 2019 | 18,134 | $ 35 | 8,031 | 11,051 | $ (1,038) | (110) | (10) | 175 |  |  |  |  |  |  |
Ending Balance at Sep. 30, 2019 |  |  |  |  |  |  |  |  | 14,079 | $ 589 | 5,644 | 8,874 | (962) | (62) | (4)
Beginning Balance (shares) at Dec. 31, 2019 |  | 333 |  |  | 23 |  |  |  |  |  |  |  |  |  |
Beginning Balance (shares) at Dec. 31, 2019 |  |  |  |  |  |  |  |  |  | 235 |  |  |  |  |
Beginning Balance at Dec. 31, 2019 | 18,213 | $ 35 | 8,054 | 11,100 | $ (1,038) | (110) | (19) | 191 |  |  |  |  |  |  |
Beginning Balance at Dec. 31, 2019 | 18,022 |  |  |  |  |  |  |  | 14,147 | $ 589 | 5,669 | 8,919 | (962) | (62) | (6)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 392 |  |  | 375 |  |  |  | 17 |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 406 |  |  | 406 |  |  |
Common stock dividends | (255) |  |  | (255) |  |  |  |  | (246) |  |  | (246) |  |  |
Issuance of common shares – public offering (shares) |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares - public offering | 88 |  | 88 |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares for stock plans | 26 |  | 26 |  |  |  |  |  |  |  |  |  |  |  |
Capital contribution by parent |  |  |  |  |  |  |  |  | 25 |  | 25 |  |  |  |
Other comprehensive income | 5 |  |  |  |  |  | 5 |  | 1 |  |  |  |  |  | 1
Distributions to noncontrolling interest | (2) |  |  |  |  |  |  | (2) |  |  |  |  |  |  |
Ending Balance (shares) at Mar. 31, 2020 |  | 334 |  |  | 23 |  |  |  |  |  |  |  |  |  |
Ending Balance (shares) at Mar. 31, 2020 |  |  |  |  |  |  |  |  |  | 235 |  |  |  |  |
Ending Balance at Mar. 31, 2020 | 18,467 | $ 35 | 8,168 | 11,220 | $ (1,038) | (110) | (14) | 206 |  |  |  |  |  |  |
Ending Balance at Mar. 31, 2020 |  |  |  |  |  |  |  |  | 14,333 | $ 589 | 5,694 | 9,079 | (962) | (62) | (5)
Beginning Balance (shares) at Dec. 31, 2019 |  | 333 |  |  | 23 |  |  |  |  |  |  |  |  |  |
Beginning Balance (shares) at Dec. 31, 2019 |  |  |  |  |  |  |  |  |  | 235 |  |  |  |  |
Beginning Balance at Dec. 31, 2019 | 18,213 | $ 35 | 8,054 | 11,100 | $ (1,038) | (110) | (19) | 191 |  |  |  |  |  |  |
Beginning Balance at Dec. 31, 2019 | 18,022 |  |  |  |  |  |  |  | 14,147 | $ 589 | 5,669 | 8,919 | (962) | (62) | (6)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 1,095 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 1,058 |  |  |  |  |  |  |  | 963 |  |  |  |  |  |
Other comprehensive income | 7 |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Ending Balance (shares) at Sep. 30, 2020 |  | 334 |  |  | 23 |  |  |  |  |  |  |  |  |  |
Ending Balance (shares) at Sep. 30, 2020 |  |  |  |  |  |  |  |  |  | 235 |  |  |  |  |
Ending Balance at Sep. 30, 2020 | 18,711 | $ 35 | 8,228 | 11,391 | $ (1,038) | (110) | (12) | 217 |  |  |  |  |  |  |
Ending Balance at Sep. 30, 2020 | 18,494 |  |  |  |  |  |  |  | 14,575 | $ 589 | 5,869 | 9,145 | (962) | (62) | (4)
Beginning Balance (shares) at Mar. 31, 2020 |  | 334 |  |  | 23 |  |  |  |  |  |  |  |  |  |
Beginning Balance (shares) at Mar. 31, 2020 |  |  |  |  |  |  |  |  |  | 235 |  |  |  |  |
Beginning Balance at Mar. 31, 2020 | 18,467 | $ 35 | 8,168 | 11,220 | $ (1,038) | (110) | (14) | 206 |  |  |  |  |  |  |
Beginning Balance at Mar. 31, 2020 |  |  |  |  |  |  |  |  | 14,333 | $ 589 | 5,694 | 9,079 | (962) | (62) | (5)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 202 |  |  | 190 |  |  |  | 12 |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 152 |  |  | 152 |  |  |
Common stock dividends | (256) |  |  | (256) |  |  |  |  | (246) |  |  | (246) |  |  |
Issuance of common shares – public offering (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares - public offering | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares for stock plans | 30 |  | 30 |  |  |  |  |  |  |  |  |  |  |  |
Capital contribution by parent |  |  |  |  |  |  |  |  | 25 |  | 25 |  |  |  |
Other comprehensive income | 0 |  |  |  |  |  |  |  | 1 |  |  |  |  |  | 1
Distributions to noncontrolling interest | (2) |  |  |  |  |  |  | (2) |  |  |  |  |  |  |
Ending Balance (shares) at Jun. 30, 2020 |  | 334 |  |  | 23 |  |  |  |  |  |  |  |  |  |
Ending Balance (shares) at Jun. 30, 2020 |  |  |  |  |  |  |  |  |  | 235 |  |  |  |  |
Ending Balance at Jun. 30, 2020 | 18,441 | $ 35 | 8,198 | 11,154 | $ (1,038) | (110) | (14) | 216 |  |  |  |  |  |  |
Ending Balance at Jun. 30, 2020 |  |  |  |  |  |  |  |  | 14,265 | $ 589 | 5,719 | 8,985 | (962) | (62) | (4)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 502 |  |  | 493 |  |  |  | 9 |  |  |  |  |  |  |
Net income | 493 |  |  |  |  |  |  |  | 405 |  |  | 405 |  |  |
Common stock dividends | (256) |  |  | (256) |  |  |  |  | (245) |  |  | (245) |  |  |
Issuance of common shares – public offering (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares - public offering | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares for stock plans | 30 |  | 30 |  |  |  |  |  |  |  |  |  |  |  |
Capital contribution by parent |  |  |  |  |  |  |  |  | 150 |  | 150 |  |  |  |
Other comprehensive income | 2 |  |  |  |  |  | 2 |  | 0 |  |  |  |  |  | 0
Distributions to noncontrolling interest | (8) |  |  |  |  |  |  | (8) |  |  |  |  |  |  |
Ending Balance (shares) at Sep. 30, 2020 |  | 334 |  |  | 23 |  |  |  |  |  |  |  |  |  |
Ending Balance (shares) at Sep. 30, 2020 |  |  |  |  |  |  |  |  |  | 235 |  |  |  |  |
Ending Balance at Sep. 30, 2020 | 18,711 | $ 35 | $ 8,228 | $ 11,391 | $ (1,038) | $ (110) | $ (12) | $ 217 |  |  |  |  |  |  |
Ending Balance at Sep. 30, 2020 | $ 18,494 |  |  |  |  |  |  |  | $ 14,575 | $ 589 | $ 5,869 | $ 9,145 | $ (962) | $ (62) | $ (4)

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