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Pension Benefits - Total Periodic Benefit Costs (Details) - Pension Benefits - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost – including administrative expenses | $ 85 | $ 73 | $ 257 | $ 220
Interest cost on projected benefit obligation | 118 | 137 | 353 | 412
Expected return on plan assets | (274) | (258) | (822) | (775)
Recognition of net actuarial loss | 197 | 175 | 590 | 524
Recognition of prior service credit | (4) | (4) | (12) | (12)
TOTAL PERIODIC BENEFIT COST | 122 | 123 | 366 | 369
Cost capitalized | (41) | (34) | (120) | (98)
Reconciliation to rate level | (54) | (62) | (165) | (188)
Total credit recognized | 27 | 27 | 81 | 83
CECONY | Subsidiaries |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost – including administrative expenses | 80 | 69 | 241 | 206
Interest cost on projected benefit obligation | 111 | 129 | 332 | 387
Expected return on plan assets | (260) | (245) | (779) | (735)
Recognition of net actuarial loss | 187 | 165 | 559 | 496
Recognition of prior service credit | (5) | (5) | (15) | (15)
TOTAL PERIODIC BENEFIT COST | 113 | 113 | 338 | 339
Cost capitalized | (39) | (32) | (113) | (93)
Reconciliation to rate level | (52) | (59) | (158) | (179)
Total credit recognized | $ 22 | $ 22 | $ 67 | $ 67

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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 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 2: 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=123447040&loc=d3e1928-114920 Reference 3: 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=123450688&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 5: 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=123447040&loc=d3e2709-114920 + Details
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