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Other Postretirement Benefits - Periodic Postretirement Benefit Costs (Details) - Other Postretirement Benefits - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 5 | $ 4 | $ 11 | $ 9
Interest cost on accumulated other postretirement benefit obligation | 9 | 11 | 19 | 22
Expected return on plan assets | (16) | (16) | (33) | (33)
Recognition of net actuarial loss/(gain) | 3 | (2) | 30 | (4)
Recognition of prior service credit | (1) | (1) | (2) | (2)
TOTAL PERIODIC OTHER POSTRETIREMENT BENEFIT COST/(CREDIT) | 0 | (4) | 25 | (8)
Cost capitalized | (2) | (2) | (5) | (4)
Reconciliation to rate level | 2 | 3 | (20) | 7
Total credit recognized | 0 | (3) | 0 | (5)
CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 4 | 3 | 8 | 6
Interest cost on accumulated other postretirement benefit obligation | 8 | 9 | 16 | 18
Expected return on plan assets | (14) | (14) | (27) | (27)
Recognition of net actuarial loss/(gain) | 3 | (2) | 29 | (5)
Recognition of prior service credit | 0 | 0 | (1) | (1)
TOTAL PERIODIC OTHER POSTRETIREMENT BENEFIT COST/(CREDIT) | 1 | (4) | 25 | (9)
Cost capitalized | (2) | (2) | (3) | (3)
Reconciliation to rate level | 0 | 2 | (24) | 4
Total credit recognized | $ (1) | $ (4) | $ (2) | $ (8)

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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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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for 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)(1) -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)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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