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Pension Benefits - Total Periodic Benefit Costs (Details) - Pension Benefits - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost – including administrative expenses | $ 72 | $ 86
Interest cost on projected benefit obligation | 126 | 118
Expected return on plan assets | (292) | (276)
Recognition of net actuarial loss | 94 | 199
Recognition of prior service credit | (4) | (4)
TOTAL PERIODIC BENEFIT COST/(CREDIT) | (4) | 123
Cost capitalized | (33) | (39)
Reconciliation to rate level | 64 | (57)
Total credit recognized | 27 | 27
CECONY | Subsidiaries |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost – including administrative expenses | 67 | 81
Interest cost on projected benefit obligation | 119 | 111
Expected return on plan assets | (277) | (262)
Recognition of net actuarial loss | 89 | 189
Recognition of prior service credit | (5) | (5)
TOTAL PERIODIC BENEFIT COST/(CREDIT) | (7) | 114
Cost capitalized | (32) | (37)
Reconciliation to rate level | 61 | (55)
Total credit recognized | $ 22 | $ 22

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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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