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Mergers, Acquisitions and Dispositions (Tables) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2016
Business Combinations [Abstract] |  |
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] | The following table summarizes the final acquisition-date fair value of the consideration transferred and the assets and liabilities assumed for the FitzPatrick acquisition by Generation:
Cash paid for purchase price |  | $ | 110 |
Cash paid for net cost reimbursement |  | 125 |
Nuclear fuel transfer |  | 54 |
Total consideration transferred |  | $ | 289 |
Identifiable assets acquired and liabilities assumed |  |
Current assets |  | $ | 60 |
Property, plant and equipment |  | 298 |
Nuclear decommissioning trust funds |  | 807 |
Other assets(a) |  | 114 |
Total assets |  | $ | 1,279 |
Current liabilities |  | $ | 6 |
Nuclear decommissioning ARO |  | 444 |
Pension and OPEB obligations |  | 33 |
Deferred income taxes |  | 149 |
Spent nuclear fuel obligation |  | 110 |
Other liabilities |  | 15 |
Total liabilities |  | $ | 757 |
Total net identifiable assets, at fair value |  | $ | 522 |
Bargain purchase gain (after-tax) |  | $ | 233 |
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(a) | Includes a $110 million asset associated with a contractual right to reimbursement from the New York Power Authority (NYPA), a prior owner of FitzPatrick, associated with the DOE one-time fee obligation. See Note 22-Commitments and Contingencies for additional information regarding SNF obligations to the DOE.
Business Combination, Separately Recognized Transactions [Table Text Block] | The following amounts represent total commitment costs for Exelon, PHI, Pepco, DPL and ACE that have been recorded since the merger date:
| Expected Payment Period |  |  |  | Successor |  |  |  |  |  |
Description |  | Exelon |  | PHI |  | Pepco |  | DPL |  | ACE
Rate credits | 2016 - 2021 |  | $ | 259 |  |  | $ | 264 |  |  | $ | 91 |  |  | $ | 72 |  |  | $ | 101 |
Energy efficiency | 2016 - 2021 |  | 117 |  |  | — |  |  | — |  |  | — |  |  | — |
Charitable contributions | 2016 - 2026 |  | 50 |  |  | 50 |  |  | 28 |  |  | 12 |  |  | 10 |
Delivery system modernization | Q2 2017 |  | 22 |  |  | — |  |  | — |  |  | — |  |  | — |
Green sustainability fund | Q2 2017 |  | 14 |  |  | — |  |  | — |  |  | — |  |  | — |
Workforce development | 2016 - 2020 |  | 17 |  |  | — |  |  | — |  |  | — |  |  | — |
Other |  |  | 29 |  |  | 6 |  |  | 1 |  |  | 5 |  |  | — |
Total commitments |  |  | $ | 508 |  |  | $ | 320 |  |  | $ | 120 |  |  | $ | 89 |  |  | $ | 111 |
Remaining commitments as of December 31, 2018 |  |  | $ | 128 |  |  | $ | 92 |  |  | $ | 73 |  |  | $ | 12 |  |  | $ | 7 |
Business Acquisition, Pro Forma Information [Table Text Block] | The current impact of PHI, including its unregulated businesses, in Exelon's Consolidated Statements of Operations and Comprehensive Income includes Operating revenues and Net Income (Loss) as follows:
| For the Years Ended December 31,
| 2018 |  | 2017 |  | 2016
Operating Revenues | 4,670 |  |  | 4,829 |  |  | 3,785 |
Net Income (Loss) | 453 |  |  | 364 |  |  | (66 | )
Restructuring and Related Costs [Table Text Block] | For the periods ended December 31, 2018, 2017 and 2016, the Registrants have recognized costs to achieve the PHI merger as follows:
| For the Year Ended December 31,
Acquisition, Integration and Financing Costs(a) | 2018 |  | 2017 |  | 2016
Exelon | $ | 7 |  |  | $ | 16 |  |  | $ | 143 |
Generation | 5 |  |  | 22 |  |  | 37 |
ComEd(b) | — |  |  | 1 |  |  | (6 | )
PECO | 1 |  |  | 4 |  |  | 5 |
BGE(b) | 1 |  |  | 4 |  |  | (1 | )
Pepco(b) | — |  |  | (6 | ) |  | 28 |
DPL(b) | — |  |  | (7 | ) |  | 20 |
ACE(b) | — |  |  | (6 | ) |  | 19 |
| Successor |  |  | Predecessor
| For the Year Ended December 31, |  | March 24, 2016 to December 31, 2016 |  |  | January 1, 2016 to March 23, 2016
Acquisition, Integration and Financing Costs(a) | 2018 |  | 2017 |  |  |
PHI(b) | $ | — |  |  | $ | (18 | ) |  | $ | 69 |  |  |  | $ | 29 |
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(a) | The costs incurred are classified primarily within Operating and maintenance expense in the Registrants’ respective Consolidated Statements of Operations and Comprehensive Income, with the exception of the financing costs, which are included within Interest expense. Costs do not include merger commitments discussed above.
(b) | For the year ended December 31, 2017, includes deferrals of previously incurred integration costs as regulatory assets of $24 million, $8 million, $8 million, and $8 million at PHI, Pepco, DPL and ACE, respectively. For the year ended December 31, 2016, includes deferrals of previously incurred integration costs as regulatory assets of $8 million, $6 million, $11 million and $4 million at ComEd, BGE, Pepco and DPL, respectively. For the Successor period March 24, 2016 to December 31, 2016, includes deferrals of previously incurred integration costs as regulatory assets of $16 million at PHI. See Note 4 - Regulatory Matters for additional information.
| For the year ended December 31, 2016, the Registrants recorded the following severance costs associated with the identified job reductions within Operating and maintenance expense in their Consolidated Statements of Operations and Comprehensive Income:
Severance Benefits | Exelon |  | Generation |  | ComEd |  | PECO |  | BGE |  | PHI |  | Pepco |  | DPL |  | ACE
Severance costs(a) | $ | 57 |  |  | $ | 9 |  |  | $ | 2 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 44 |  |  | $ | 21 |  |  | $ | 13 |  |  | $ | 10 |
(a) | The amounts above for Generation, ComEd, PECO, BGE, Pepco, DPL, and ACE include $8 million, $2 million, $1 million, $1 million, $20 million, $12 million and $10 million, respectively, for amounts billed by BSC and/or PHISCO through intercompany allocations.
Business Acquisition, Pro Forma Information, Nonrecurring Adjustments [Table Text Block] | The unaudited pro-forma financial information has been presented for illustrative purposes only and is not necessarily indicative of results of operations that would have been achieved had the merger events taken place on the dates indicated, or future consolidated results of operations of the combined company.
| Year Ended December 31,
| 2016(a) |  | 2015(b)
Total operating revenues | $ | 32,342 |  |  | $ | 33,823 |
Net income attributable to common shareholders | 1,562 |  |  | 2,618 |
Basic earnings per share | $ | 1.69 |  |  | $ | 2.85 |
Diluted earnings per share | 1.69 |  |  | 2.84 |
______________
(a) | The amounts above exclude non-recurring costs directly related to the merger of $680 million and intercompany revenue of $171 million for the year ended December 31, 2016.
(b) | The amounts above exclude non-recurring costs directly related to the merger of $92 million and intercompany revenue of $559 million for the year ended December 31, 2015.

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- Definition Tabular disclosure of the nature and amount of any material, nonrecurring adjustments directly attributable to the business combination(s) included in the reported pro forma revenue and earnings (supplemental pro forma information). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Tabular disclosure of the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed. May include but not limited to the following: (a) acquired receivables; (b) contingencies recognized at the acquisition date; and (c) the fair value of noncontrolling interests in the acquiree. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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