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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, 2017 |  | 310 |  |  | 23 |  |  |  |  |  |  |  |  |  |
Beginning Balance (shares) at Dec. 31, 2017 |  |  |  |  |  |  |  |  |  | 235 |  |  |  |  |
Beginning Balance at Dec. 31, 2017 | $ 15,425 | $ 34 | $ 6,298 | $ 10,235 | $ (1,038) | $ (85) | $ (26) | $ 7 |  |  |  |  |  |  |
Beginning Balance at Dec. 31, 2017 |  |  |  |  |  |  |  |  | $ 12,439 | $ 589 | $ 4,649 | $ 8,231 | $ (962) | $ (62) | $ (6)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 428 |  |  | 428 |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 389 |  |  | 389 |  |  |
Common stock dividends | (221) |  |  | (221) |  |  |  |  | (211) |  |  | (211) |  |  |
Issuance of common shares for stock plans (shares) |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares for stock plans | 25 |  | 25 |  |  |  |  |  |  |  |  |  |  |  |
Capital contribution by parent |  |  |  |  |  |  |  |  | 45 |  | 45 |  |  |  |
Other comprehensive income | 4 |  |  |  |  |  | 4 |  | 0 |  |  |  |  |  |
Distributions to noncontrolling interest | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance (shares) at Mar. 31, 2018 |  | 311 |  |  | 23 |  |  |  |  |  |  |  |  |  |
Ending Balance (shares) at Mar. 31, 2018 |  |  |  |  |  |  |  |  |  | 235 |  |  |  |  |
Ending Balance at Mar. 31, 2018 | 15,661 | $ 34 | 6,323 | 10,442 | $ (1,038) | (85) | (22) | 7 |  |  |  |  |  |  |
Ending Balance at Mar. 31, 2018 |  |  |  |  |  |  |  |  | 12,662 | $ 589 | 4,694 | 8,409 | (962) | (62) | (6)
Beginning Balance (shares) at Dec. 31, 2017 |  | 310 |  |  | 23 |  |  |  |  |  |  |  |  |  |
Beginning Balance (shares) at Dec. 31, 2017 |  |  |  |  |  |  |  |  |  | 235 |  |  |  |  |
Beginning Balance at Dec. 31, 2017 | 15,425 | $ 34 | 6,298 | 10,235 | $ (1,038) | (85) | (26) | 7 |  |  |  |  |  |  |
Beginning Balance at Dec. 31, 2017 |  |  |  |  |  |  |  |  | 12,439 | $ 589 | 4,649 | 8,231 | (962) | (62) | (6)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 1,051 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 1,051 |  |  |  |  |  |  |  | 969 |  |  |  |  |  |
Other comprehensive income | 8 |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Ending Balance (shares) at Sep. 30, 2018 |  | 311 |  |  | 23 |  |  |  |  |  |  |  |  |  |
Ending Balance (shares) at Sep. 30, 2018 |  |  |  |  |  |  |  |  |  | 235 |  |  |  |  |
Ending Balance at Sep. 30, 2018 | 15,898 | $ 34 | 6,375 | 10,619 | $ (1,038) | (85) | (18) | 11 |  |  |  |  |  |  |
Ending Balance at Sep. 30, 2018 |  |  |  |  |  |  |  |  | 12,869 | $ 589 | 4,744 | 8,565 | (962) | (62) | (5)
Beginning Balance (shares) at Mar. 31, 2018 |  | 311 |  |  | 23 |  |  |  |  |  |  |  |  |  |
Beginning Balance (shares) at Mar. 31, 2018 |  |  |  |  |  |  |  |  |  | 235 |  |  |  |  |
Beginning Balance at Mar. 31, 2018 | 15,661 | $ 34 | 6,323 | 10,442 | $ (1,038) | (85) | (22) | 7 |  |  |  |  |  |  |
Beginning Balance at Mar. 31, 2018 |  |  |  |  |  |  |  |  | 12,662 | $ 589 | 4,694 | 8,409 | (962) | (62) | (6)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 188 |  |  | 188 |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 149 |  |  | 149 |  |  |
Common stock dividends | (223) |  |  | (223) |  |  |  |  | (212) |  |  | (212) |  |  |
Issuance of common shares for stock plans (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares for stock plans | 27 |  | 27 |  |  |  |  |  |  |  |  |  |  |  |
Capital contribution by parent |  |  |  |  |  |  |  |  | 25 |  | 25 |  |  |  |
Other comprehensive income | 2 |  |  |  |  |  | 2 |  | 1 |  |  |  |  |  | 1
Distributions to noncontrolling interest | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance (shares) at Jun. 30, 2018 |  | 311 |  |  | 23 |  |  |  |  |  |  |  |  |  |
Ending Balance (shares) at Jun. 30, 2018 |  |  |  |  |  |  |  |  |  | 235 |  |  |  |  |
Ending Balance at Jun. 30, 2018 | 15,655 | $ 34 | 6,350 | 10,407 | $ (1,038) | (85) | (20) | 7 |  |  |  |  |  |  |
Ending Balance at Jun. 30, 2018 |  |  |  |  |  |  |  |  | 12,625 | $ 589 | 4,719 | 8,346 | (962) | (62) | (5)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 435 |  |  | 435 |  |  |  |  |  |  |  |  |  |  |
Net income | 435 |  |  |  |  |  |  |  | 431 |  |  | 431 |  |  |
Common stock dividends | (223) |  |  | (223) |  |  |  |  | (212) |  |  | (212) |  |  |
Issuance of common shares for stock plans (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares for stock plans | 25 |  | 25 |  |  |  |  |  |  |  |  |  |  |  |
Capital contribution by parent |  |  |  |  |  |  |  |  | 25 |  | 25 |  |  |  |
Other comprehensive income | 2 |  |  |  |  |  | 2 |  | 0 |  |  |  |  |  |
Noncontrolling interest | 4 |  |  |  |  |  |  | 4 |  |  |  |  |  |  |
Ending Balance (shares) at Sep. 30, 2018 |  | 311 |  |  | 23 |  |  |  |  |  |  |  |  |  |
Ending Balance (shares) at Sep. 30, 2018 |  |  |  |  |  |  |  |  |  | 235 |  |  |  |  |
Ending Balance at Sep. 30, 2018 | 15,898 | $ 34 | 6,375 | 10,619 | $ (1,038) | (85) | (18) | 11 |  |  |  |  |  |  |
Ending Balance at Sep. 30, 2018 |  |  |  |  |  |  |  |  | 12,869 | $ 589 | 4,744 | 8,565 | (962) | (62) | (5)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 331 |  |  | 331 |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 227 |  |  | 227 |  |  |
Common stock dividends | (222) |  |  | (222) |  |  |  |  | (211) |  |  | (211) |  |  |
Issuance of common shares – public offering (shares) |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares – public offering | 705 |  | 719 |  |  | (14) |  |  |  |  |  |  |  |  |
Issuance of common shares for stock plans (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares for stock plans | 23 |  | 23 |  |  |  |  |  |  |  |  |  |  |  |
Capital contribution by parent |  |  |  |  |  |  |  |  | 25 |  | 25 |  |  |  |
Other comprehensive income | 2 |  |  |  |  |  | 2 |  | 0 |  |  |  |  |  |
Noncontrolling interest | 102 |  |  |  |  |  |  | 102 |  |  |  |  |  |  |
Ending Balance (shares) at Dec. 31, 2018 |  | 321 |  |  | 23 |  |  |  |  |  |  |  |  |  |
Ending Balance (shares) at Dec. 31, 2018 |  |  |  |  |  |  |  |  |  | 235 |  |  |  |  |
Ending Balance at Dec. 31, 2018 | 16,839 | $ 34 | 7,117 | 10,728 | $ (1,038) | (99) | (16) | 113 |  |  |  |  |  |  |
Ending Balance at Dec. 31, 2018 | 16,726 |  |  |  |  |  |  |  | 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 | 16,726 |  |  |  |  |  |  |  | 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 | 17,959 |  |  |  |  |  |  |  | 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 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 | $ 17,959 |  |  |  |  |  |  |  | $ 14,079 | $ 589 | $ 5,644 | $ 8,874 | $ (962) | $ (62) | $ (4)

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