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Schedule I - Condensed Financial Information of Parent (Exelon Corporate) - Condensed Statements of Operations and Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total operating expenses |  |  |  |  |  |  |  |  |  | $ 32,143 | $ 29,619 | $ 28,106
Operating income (loss) |  | $ 708 | $ 1,146 | $ 942 | $ 1,101 | $ 1,288 | $ 1,499 | $ 300 | $ 1,308 | 3,898 | 4,395 | 3,212
Other income and (deductions) |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  |  | (1,529) | (1,524) | (1,495)
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | (28) | (32) | (24)
Other, net |  |  |  |  |  |  |  |  |  | (112) | 947 | 297
Total other income and (deductions) |  |  |  |  |  |  |  |  |  | (1,666) | (613) | (1,239)
Income taxes |  | $ 26 |  |  |  |  |  |  |  | 120 | (126) | 753
Net income (loss) |  |  |  |  |  |  |  |  |  | 2,084 | 3,876 | 1,196
Pension and non-pension postretirement benefit plans: |  |  |  |  |  |  |  |  |  |  |  |
Prior service benefit reclassified to periodic benefit cost |  |  |  |  |  |  |  |  |  | (66) | (56) | (48)
Actuarial loss reclassified to periodic cost, net of tax |  |  |  |  |  |  |  |  |  | 247 | 197 | 184
Unrealized gain on cash flow hedges |  |  |  |  |  |  |  |  |  | 12 | 3 | 2
Unrealized gain on marketable securities |  |  |  |  |  |  |  |  |  | 0 | 6 | 1
Unrealized (loss) gain on foreign currency translation |  |  |  |  |  |  |  |  |  | (10) | 7 | 10
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  | 42 | 171 | (36)
Comprehensive Income |  |  |  |  |  |  |  |  |  | 2,051 | 3,959 | 1,085
Exelon Corporate [Member] |  |  |  |  |  |  |  |  |  |  |  |
Operating Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Operating and maintenance |  |  |  |  |  |  |  |  |  | (5) | 10 | 221
Operating and maintenance from affiliates | [1] |  |  |  |  |  |  |  |  | 9 | 25 | 51
Other |  |  |  |  |  |  |  |  |  | 4 | 4 | 4
Total operating expenses |  |  |  |  |  |  |  |  |  | 8 | 39 | 276
Operating income (loss) |  |  |  |  |  |  |  |  |  | (8) | (39) | (276)
Other income and (deductions) |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  |  | (312) | (315) | (312)
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 2,188 | 4,414 | 1,508
Interest income from affiliates, net |  |  |  |  |  |  |  |  |  | 42 | 40 | 39
Other, net |  |  |  |  |  |  |  |  |  | 3 | 1 | 7
Total other income and (deductions) |  |  |  |  |  |  |  |  |  | 1,921 | 4,140 | 1,242
Income before income taxes |  |  |  |  |  |  |  |  |  | 1,913 | 4,101 | 966
Income taxes |  |  |  |  |  |  |  |  |  | (97) | 315 | (155)
Net income (loss) |  |  |  |  |  |  |  |  |  | 2,010 | 3,786 | 1,121
Pension and non-pension postretirement benefit plans: |  |  |  |  |  |  |  |  |  |  |  |
Prior service benefit reclassified to periodic benefit cost |  |  |  |  |  |  |  |  |  | (66) | (56) | (48)
Actuarial loss reclassified to periodic cost, net of tax |  |  |  |  |  |  |  |  |  | 247 | 197 | 184
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), after Tax |  |  |  |  |  |  |  |  |  | (143) | 10 | (181)
Unrealized gain on cash flow hedges |  |  |  |  |  |  |  |  |  | 12 | 3 | 2
Unrealized gain (loss) on equity investments |  |  |  |  |  |  |  |  |  | 1 | 6 | (4)
Unrealized gain on marketable securities |  |  |  |  |  |  |  |  |  | 0 | 6 | 1
Unrealized (loss) gain on foreign currency translation |  |  |  |  |  |  |  |  |  | (10) | 7 | 10
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  | 41 | 173 | (36)
Comprehensive Income |  |  |  |  |  |  |  |  |  | $ 2,051 | $ 3,959 | $ 1,085
[1] | Exelon Corporate receives a variety of corporate support services from BSC, including legal, human resources, financial, information technology and supply management services. All services are provided at cost, including applicable overhead.

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