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v3.21.2

Other Postretirement Benefits - Periodic Postretirement Benefit Costs (Details) - Other Postretirement 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 | $ 2 | $ 5 | $ 15 | $ 16
Interest cost on projected other postretirement benefit obligation | 7 | 9 | 23 | 28
Expected return on plan assets | (17) | (16) | (51) | (49)
Recognition of net actuarial loss/(gain) | 4 | 3 | 17 | 34
Recognition of prior service credit | 0 | (1) | (2) | (3)
TOTAL PERIODIC OTHER POSTRETIREMENT BENEFIT COST | (4) | 0 | 2 | 26
Cost capitalized | (3) | (2) | (9) | (7)
Reconciliation to rate level | 7 | 2 | 7 | (19)
Total credit recognized | 0 | 0 | 0 | 0
CECONY | Subsidiaries |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost - including administrative expenses | 1 | 4 | 11 | 12
Interest cost on projected other postretirement benefit obligation | 6 | 8 | 19 | 23
Expected return on plan assets | (14) | (14) | (41) | (41)
Recognition of net actuarial loss/(gain) | 3 | 3 | 13 | 32
Recognition of prior service credit | 0 | 0 | (1) | (1)
TOTAL PERIODIC OTHER POSTRETIREMENT BENEFIT COST | (4) | 1 | 1 | 25
Cost capitalized | (3) | (2) | (7) | (5)
Reconciliation to rate level | 6 | 0 | 2 | (24)
Total credit recognized | $ (1) | $ (1) | $ (4) | $ (4)

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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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