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Pension Benefits - Total Periodic Benefit Costs (Details) - Pension Benefits - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost – including administrative expenses | $ 250 | $ 290 | $ 263
Interest cost on projected benefit obligation | 601 | 561 | 591
Expected return on plan assets | (988) | (1,033) | (968)
Recognition of net actuarial loss | 518 | 688 | 595
Recognition of prior service cost/(credit) | (17) | (17) | (17)
TOTAL PERIODIC BENEFIT COST | 364 | 489 | 464
Cost capitalized | (108) | (127) | (181)
Reconciliation to rate level | (15) | (92) | (34)
Total credit recognized | 241 | 270 | 249
CECONY |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost – including administrative expenses | 232 | 272 | 246
Interest cost on projected benefit obligation | 564 | 525 | 554
Expected return on plan assets | (936) | (979) | (917)
Recognition of net actuarial loss | 492 | 651 | 563
Recognition of prior service cost/(credit) | (19) | (19) | (19)
TOTAL PERIODIC BENEFIT COST | 333 | 450 | 427
Cost capitalized | (102) | (119) | (169)
Reconciliation to rate level | (12) | (100) | (41)
Total credit recognized | $ 219 | $ 231 | $ 217

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- Definition Total Periodic Benefit Cost After Amortization of Regulatory Asset + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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