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Consolidated Statement of Capitalization - Long-term Debt - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Other long-term debt |  | $ 974 | $ 304
Unamortized debt expense |  | (141) | (152)
Unamortized debt discount |  | (37) | (33)
TOTAL |  | 19,973 | 18,145
Less: Long-term debt due within one year |  | 1,446 | 650
TOTAL LONG-TERM DEBT |  | 18,527 | 17,495
TOTAL CAPITALIZATION |  | 36,549 | 34,221
CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Unamortized debt expense |  | (115) | (107)
Unamortized debt discount |  | (36) | (32)
TOTAL |  | 14,964 | 14,151
Less: Long-term debt due within one year |  | 350 | 475
TOTAL LONG-TERM DEBT |  | 14,614 | 13,676
TOTAL CAPITALIZATION |  | $ 28,761 | 26,586
Copper Mountain Solar 2 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.52% |
TOTAL PROJECT DEBT | [1] | $ 224 | 230
Coram |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
TOTAL PROJECT DEBT | [1] | $ 150 | 160
Coram | Minimum |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 5.96% |
Coram | Maximum |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.52% |
Copper Mountain Solar 3 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.61% |
TOTAL PROJECT DEBT | [1] | $ 289 | 298
CED Southwest |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 3.72% |
TOTAL PROJECT DEBT | [1] | $ 456 | 0
Wind Holdings |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.41% |
TOTAL PROJECT DEBT |  | $ 123 | 137
Copper Mountain Solar 1 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 3.81% |
TOTAL PROJECT DEBT | [1] | $ 67 | 70
Mesquite Solar 1 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
TOTAL PROJECT DEBT |  | $ 193 | 208
Mesquite Solar 1 | Minimum |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 2.24% |
Mesquite Solar 1 | Maximum |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 3.03% |
Texas Solar 4 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
TOTAL PROJECT DEBT |  | $ 56 | 58
Texas Solar 4 | Minimum |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 5.28% |
Texas Solar 4 | Maximum |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.95% |
California Solar 2 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 3.94% |
TOTAL PROJECT DEBT |  | $ 98 | 103
California Solar 3 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.07% |
TOTAL PROJECT DEBT |  | $ 86 | 89
California Solar |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.78% |
TOTAL PROJECT DEBT |  | $ 184 | 190
California Solar 4 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 3.82% |
TOTAL PROJECT DEBT |  | $ 297 | 0
Broken Bow II |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.82% |
TOTAL PROJECT DEBT |  | $ 68 | 69
Texas Solar 5 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.53% |
TOTAL PROJECT DEBT |  | $ 145 | 150
Texas Solar 7 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.21% |
TOTAL PROJECT DEBT |  | $ 199 | 206
Upton County Solar |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.45% |
TOTAL PROJECT DEBT |  | $ 90 | 94
Other project debt |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
TOTAL PROJECT DEBT |  | 12 | 14
Project Debt |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
TOTAL PROJECT DEBT |  | 2,737 | 2,076
Debentures |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
TOTAL |  | 15,990 | 15,500
Debentures | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
TOTAL |  | $ 14,665 | 13,840
Debentures | Debenture Series 2009A, 4.96% Due 2019 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.96% |
TOTAL |  | $ 0 | 60
Debentures | Debenture Series 2009B, 6.65% Due 2019 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 6.65% |
TOTAL |  | $ 0 | 475
Debentures | Debenture Series 2009B, 6.65% Due 2019 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 6.65% |
TOTAL |  | $ 0 | 475
Debentures | Debenture 2017A, 2.00 Percent, Due 2019 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 2.00% |
TOTAL |  | $ 0 | 400
Debentures | Debenture Series 2010A, 4.45% Due 2020 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.45% |
TOTAL |  | $ 350 | 350
Debentures | Debenture Series 2010A, 4.45% Due 2020 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.45% |
TOTAL |  | $ 350 | 350
Debentures | Debenture Series 2016A, 2.00% Due 2021 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 2.00% |
TOTAL |  | $ 500 | 500
Debentures | Debenture 2018C, 2.75 Percent, Due 2021 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 2.35% |
TOTAL | [2] | $ 640 | 640
Debentures | Debenture 2018C, 2.75 Percent, Due 2021 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 2.35% |
TOTAL |  | $ 640 | 640
Debentures | Debenture 2014B, 3.30 Percent, Due 2024 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 3.30% |
TOTAL |  | $ 250 | 250
Debentures | Debenture 2014B, 3.30 Percent, Due 2024 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 3.30% |
TOTAL |  | $ 250 | 250
Debentures | Debenture Series 2016B, 2.90% Due 2026 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 2.90% |
TOTAL |  | $ 250 | 250
Debentures | Debenture Series 2016B, 2.90% Due 2026 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 2.90% |
TOTAL |  | $ 250 | 250
Debentures | Debenture Series 1997F, 6.50% Due 2027 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 6.50% |
TOTAL |  | $ 80 | 80
Debentures | Debenture Series 2017B, 3.125% Due 2027 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 3.125% |
TOTAL |  | $ 350 | 350
Debentures | Debenture Series 2017B, 3.125% Due 2027 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 3.125% |
TOTAL |  | $ 350 | 350
Debentures | Debenture Series 2018A, 3.80% Due 2028 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 3.80% |
TOTAL |  | $ 300 | 300
Debentures | Debenture Series 2018A, 3.80% Due 2028 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 3.80% |
TOTAL |  | $ 300 | 300
Debentures | Debenture Series 2018D, 4.00% Due 2028 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.00% |
TOTAL |  | $ 500 | 500
Debentures | Debenture Series 2018D, 4.00% Due 2028 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.00% |
TOTAL |  | $ 500 | 500
Debentures | Debenture 2019B, 2.94 Percent, Due 2029 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 2.94% |
TOTAL |  | $ 44 | 0
Debentures | Debenture Series 2003A, 5.875% Due 2033 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 5.875% |
TOTAL |  | $ 175 | 175
Debentures | Debenture Series 2003A, 5.875% Due 2033 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 5.875% |
TOTAL |  | $ 175 | 175
Debentures | Debenture Series 2003C, 5.10% Due 2033 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 5.10% |
TOTAL |  | $ 200 | 200
Debentures | Debenture Series 2003C, 5.10% Due 2033 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 5.10% |
TOTAL |  | $ 200 | 200
Debentures | Debenture Series 2004B, 5.70% Due 2034 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 5.70% |
TOTAL |  | $ 200 | 200
Debentures | Debenture Series 2004B, 5.70% Due 2034 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 5.70% |
TOTAL |  | $ 200 | 200
Debentures | Debenture Series 2005A, 5.30% Due 2035 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 5.30% |
TOTAL |  | $ 350 | 350
Debentures | Debenture Series 2005A, 5.30% Due 2035 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 5.30% |
TOTAL |  | $ 350 | 350
Debentures | Debenture Series 2005B, 5.25% Due 2035 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 5.25% |
TOTAL |  | $ 125 | 125
Debentures | Debenture Series 2005B, 5.25% Due 2035 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 5.25% |
TOTAL |  | $ 125 | 125
Debentures | Debenture Series 2006A, 5.85% Due 2036 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 5.85% |
TOTAL |  | $ 400 | 400
Debentures | Debenture Series 2006A, 5.85% Due 2036 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 5.85% |
TOTAL |  | $ 400 | 400
Debentures | Debenture Series 2006B, 6.20% Due 2036 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 6.20% |
TOTAL |  | $ 400 | 400
Debentures | Debenture Series 2006B, 6.20% Due 2036 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 6.20% |
TOTAL |  | $ 400 | 400
Debentures | Debenture Series 2006E, 5.70% Due 2036 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 5.70% |
TOTAL |  | $ 250 | 250
Debentures | Debenture Series 2006E, 5.70% Due 2036 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 5.70% |
TOTAL |  | $ 250 | 250
Debentures | Debenture Series 2007A, 6.30% Due 2037 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 6.30% |
TOTAL |  | $ 525 | 525
Debentures | Debenture Series 2007A, 6.30% Due 2037 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 6.30% |
TOTAL |  | $ 525 | 525
Debentures | Debenture 2008B, 6.75 Percent, Due 2038 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 6.75% |
TOTAL |  | $ 600 | 600
Debentures | Debenture 2008B, 6.75 Percent, Due 2038 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 6.75% |
TOTAL |  | $ 600 | 600
Debentures | Debenture 2009B, 6.00 Percent, Due 2039 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 6.00% |
TOTAL |  | $ 60 | 60
Debentures | Debenture 2009C, 5.50 Percent, Due 2039 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 5.50% |
TOTAL |  | $ 600 | 600
Debentures | Debenture 2009C, 5.50 Percent, Due 2039 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 5.50% |
TOTAL |  | $ 600 | 600
Debentures | Debenture 2019C, 3.46 Percent, Due 2039 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 3.46% |
TOTAL |  | $ 38 | 0
Debentures | Debenture 2010B, 5.70 Percent, Due 2040 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 5.70% |
TOTAL |  | $ 350 | 350
Debentures | Debenture 2010B, 5.70 Percent, Due 2040 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 5.70% |
TOTAL |  | $ 350 | 350
Debentures | Debenture 2010B, 5.50 Percent, Due 2040 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 5.50% |
TOTAL |  | $ 115 | 115
Debentures | Debenture 2012A, 4.20 Percent, Due 2042 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.20% |
TOTAL |  | $ 400 | 400
Debentures | Debenture 2012A, 4.20 Percent, Due 2042 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.20% |
TOTAL |  | $ 400 | 400
Debentures | Debenture 2013A, 3.95 Percent, Due 2043 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 3.95% |
TOTAL |  | $ 700 | 700
Debentures | Debenture 2013A, 3.95 Percent, Due 2043 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 3.95% |
TOTAL |  | $ 700 | 700
Debentures | Debenture 2014A, 4.45 Percent, Due 2044 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.45% |
TOTAL |  | $ 850 | 850
Debentures | Debenture 2014A, 4.45 Percent, Due 2044 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.45% |
TOTAL |  | $ 850 | 850
Debentures | Debenture 2015A, 4.50 Percent, Due 2045 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.50% |
TOTAL |  | $ 650 | 650
Debentures | Debenture 2015A, 4.50 Percent, Due 2045 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.50% |
TOTAL |  | $ 650 | 650
Debentures | Debenture 2015A, 4.95 Percent, Due 2045 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.95% |
TOTAL |  | $ 120 | 120
Debentures | Debenture Series 2015B, 4.69% due 2045 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.69% |
TOTAL |  | $ 100 | 100
Debentures | Debenture 2016A, 3.85 Percent, Due 2046 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 3.85% |
TOTAL |  | $ 550 | 550
Debentures | Debenture 2016A, 3.85 Percent, Due 2046 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 3.85% |
TOTAL |  | $ 550 | 550
Debentures | Debenture Series 2016A. 3.88% Due 2046 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 3.88% |
TOTAL |  | $ 75 | 75
Debentures | Debenture Series 2017A, 3.875% Due 2047 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 3.875% |
TOTAL |  | $ 500 | 500
Debentures | Debenture Series 2017A, 3.875% Due 2047 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 3.875% |
TOTAL |  | $ 500 | 500
Debentures | Debenture Series 2018E, 4.65% Due 2048 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.65% |
TOTAL |  | $ 600 | 600
Debentures | Debenture Series 2018E, 4.65% Due 2048 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.65% |
TOTAL |  | $ 600 | 600
Debentures | Debenture Series 2018A, 4.35% Due 2048 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.35% |
TOTAL |  | $ 125 | 125
Debentures | Debenture Series 2018B, 4.35% Due 2048 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.35% |
TOTAL |  | $ 25 | 25
Debentures | Debenture 2019A, 4.125 Percent, Due 2049 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.125% |
TOTAL |  | $ 700 | 0
Debentures | Debenture 2019A, 4.125 Percent, Due 2049 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.125% |
TOTAL |  | $ 700 | 0
Debentures | Debenture 2019A, 3.73 Percent, Due 2049 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 3.73% |
TOTAL |  | $ 43 | 0
Debentures | Debenture Series 2014C, 4.625% Due 2054 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.625% |
TOTAL |  | $ 750 | 750
Debentures | Debenture Series 2014C, 4.625% Due 2054 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.625% |
TOTAL |  | $ 750 | 750
Debentures | Debenture Series 2016C, 4.30% Due 2056 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.30% |
TOTAL |  | $ 500 | 500
Debentures | Debenture Series 2016C, 4.30% Due 2056 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.30% |
TOTAL |  | $ 500 | 500
Debentures | Debenture Series 2017C, 4.00% Due 2057 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.00% |
TOTAL |  | $ 350 | 350
Debentures | Debenture Series 2017C, 4.00% Due 2057 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.00% |
TOTAL |  | $ 350 | 350
Debentures | Debenture Series 2018B, 4.50% Due 2058 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.50% |
TOTAL |  | $ 700 | 700
Debentures | Debenture Series 2018B, 4.50% Due 2058 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 4.50% |
TOTAL |  | $ 700 | 700
Debentures | Debenture 2019B, 3.70 Percent, Due 2059 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 3.70% |
TOTAL |  | $ 600 | 0
Debentures | Debenture 2019B, 3.70 Percent, Due 2059 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 3.70% |
TOTAL |  | $ 600 | 0
Tax-Exempt Debt |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
TOTAL PROJECT DEBT |  | 450 | 450
Tax-Exempt Debt | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
TOTAL |  | $ 450 | 450
Tax-Exempt Debt | Tax Exempt Debt Series 2010A Due 2036 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 1.63% |
TOTAL PROJECT DEBT | [2] | $ 225 | 225
Tax-Exempt Debt | Tax Exempt Debt Series 2010A Due 2036 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 1.63% |
TOTAL | [3] | $ 225 | 225
Tax-Exempt Debt | Tax Exempt Debt Series 2004C, 1.663% Due 2039 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 1.63% |
TOTAL PROJECT DEBT | [2] | $ 99 | 99
Tax-Exempt Debt | Tax Exempt Debt Series 2004C, 1.663% Due 2039 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 1.63% |
TOTAL | [3] | $ 99 | 99
Tax-Exempt Debt | Tax-Exempt Debt Series 2005A, 1.627% Due 2039 |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 1.59% |
TOTAL PROJECT DEBT | [2] | $ 126 | 126
Tax-Exempt Debt | Tax-Exempt Debt Series 2005A, 1.627% Due 2039 | CECONY |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |
Interest Rate |  | 1.59% |
TOTAL | [3] | $ 126 | $ 126
[1] | December 31, 2019 effective rates shown, reflecting variable interest rates on the debt that are reset quarterly or semi-annually and the effect of applicable interest rate swaps, if any
[2] | Rates reset weekly or quarterly; December 31, 2019 rates shown.
[3] | Rates reset weekly or quarterly; December 31, 2019 rates shown.

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- Definition This element represents the total consolidated (as applicable) capitalization of the entity which is comprised of its long-term debt and equity instruments. The table may be detailed by subsidiary (legal entity) and include information by type of debt or equity detailed by instrument. + References No definition available. + Details
Name: | us-gaap_CapitalizationLongtermDebtAndEquity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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