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Other Postretirement Benefits - Periodic Postretirement Benefit Costs (Details) - Other Postretirement Benefits - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 4 | $ 5 | $ 13 | $ 15
Interest cost on accumulated other postretirement benefit obligation | 11 | 11 | 33 | 32
Expected return on plan assets | (16) | (18) | (49) | (55)
Recognition of net actuarial loss/(gain) | (2) | 2 | (6) | 6
Recognition of prior service cost/(credit) | (1) | (2) | (2) | (5)
TOTAL PERIODIC OTHER POSTRETIREMENT BENEFIT COST/(CREDIT) | (4) | (2) | (11) | (7)
Cost capitalized | (1) | (2) | (6) | (6)
Reconciliation to rate level | 3 | 2 | 10 | 6
Total expense/(credit) recognized | (2) | (2) | (7) | (7)
CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 3 | 3 | 9 | 10
Interest cost on accumulated other postretirement benefit obligation | 9 | 9 | 27 | 26
Expected return on plan assets | (14) | (16) | (41) | (47)
Recognition of net actuarial loss/(gain) | (2) | 1 | (7) | 2
Recognition of prior service cost/(credit) | 0 | (1) | (1) | (2)
TOTAL PERIODIC OTHER POSTRETIREMENT BENEFIT COST/(CREDIT) | (4) | (4) | (13) | (11)
Cost capitalized | (2) | (1) | (4) | (4)
Reconciliation to rate level | 2 | 2 | 6 | 7
Total expense/(credit) recognized | $ (4) | $ (3) | $ (11) | $ (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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