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Pension Benefits - Additional Information (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension liability | $ 185,000,000 |  |  |
Investments value | 397,000,000 | $ 326,000,000 |  |
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Regulatory assets and liabilities for future income taxes, net | 167,000,000 |  |  |
Charge to OCI | 10,000,000 |  |  |
Net loss estimated to be amortized | 701,000,000 |  |  |
Prior service cost estimated to be amortized | (16,000,000) |  |  |
Investments value | 15,608,000,000 | 13,450,000,000 | $ 14,274,000,000 | $ 12,472,000,000
Accumulated benefit obligation | 15,015,000,000 | 13,030,000,000 | 13,897,000,000 |
Defined benefit plan, bond amount (excess of) | 50,000,000 |  |  |
Estimated future employer contributions | 472,000,000 |  |  |
Other Nonqualified Supplemental Defined Benefit Pension |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation | 395,000,000 | 316,000,000 |  |
CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension liability | 162,000,000 |  |  |
Investments value | 371,000,000 | 301,000,000 |  |
CECONY | Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Regulatory assets and liabilities for future income taxes, net | 147,000,000 |  |  |
Charge to OCI | 2,000,000 |  |  |
Net loss estimated to be amortized | 663,000,000 |  |  |
Prior service cost estimated to be amortized | (20,000,000) |  |  |
Investments value | 14,790,000,000 | 12,744,000,000 | 13,519,000,000 | $ 11,815,000,000
Accumulated benefit obligation | 14,010,000,000 | 12,161,000,000 | $ 12,972,000,000 |
Estimated future employer contributions | 433,000,000 |  |  |
CECONY | Other Nonqualified Supplemental Defined Benefit Pension |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation | $ 360,000,000 | $ 285,000,000 |  |

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- Definition Amount of liability, recognized in statement of financial position, for defined benefit pension plan. Excludes other postretirement benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(15)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1703-114919 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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