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Stock-Based Compensation Plans (All Registrants) (Tables) | 12 Months Ended
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Dec. 31, 2018
Common Stock [Abstract] |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] | The following tables present the stock-based compensation expense included in Exelon's and PHI’s Consolidated Statements of Operations and Comprehensive Income for the years ended December 31, 2018, 2017 and 2016 and PHI's predecessor period January 1, 2016 to March 23, 2016:
Exelon | Year Ended December 31,
Components of Stock-Based Compensation Expense | 2018 |  | 2017 |  | 2016(a)
Performance share awards | $ | 143 |  |  | $ | 107 |  |  | $ | 93 |
Restricted stock units | 57 |  |  | 77 |  |  | 75 |
Stock options | — |  |  | — |  |  | — |
Other stock-based awards | 8 |  |  | 7 |  |  | 7 |
Total stock-based compensation expense included in operating and maintenance expense | 208 |  |  | 191 |  |  | 175 |
Income tax benefit | (54 | ) |  | (74 | ) |  | (68 | )
Total after-tax stock-based compensation expense | $ | 154 |  |  | $ | 117 |  |  | $ | 107 |
__________
(a) | 2016 amounts include expense related to stock-based compensation granted to eligible PHI employees since the merger date of March 23, 2016.
PHI
| Predecessor
| January 1 to March 23,
Components of Stock-Based Compensation Expense | 2016
Time-based restricted stock units | $ | 2 |
Performance-based restricted stock units | 1 |
Time-based restricted stock awards | — |
Total stock-based compensation expense included in operating and maintenance expense | 3 |
Income tax benefit | (1 | )
Total after-tax stock-based compensation expense | $ | 2 |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] | The following tables present the Registrants' stock-based compensation expense (pre-tax) for the years ended December 31, 2018, 2017 and 2016, as well as for the PHI predecessor period January 1, 2016 to March 23, 2016:
| Year Ended December 31,
Subsidiaries | 2018 |  | 2017 |  | 2016
Exelon | $ | 208 |  |  | $ | 191 |  |  | $ | 175 |
Generation | 77 |  |  | 88 |  |  | 78 |
ComEd | 8 |  |  | 7 |  |  | 8 |
PECO | 5 |  |  | 3 |  |  | 3 |
BGE | 3 |  |  | 1 |  |  | 1 |
BSC(a) | 111 |  |  | 88 |  |  | 81 |
PHI Successor(b)(c) | 4 |  |  | 4 |  |  | 4 |
| Predecessor
| January 1 to March 23,
| 2016
PHI | $ | 3 |
__________
(a) | These amounts primarily represent amounts billed to Exelon’s subsidiaries through intercompany allocations. These amounts are not included in the Generation, ComEd, PECO, BGE or PHI amounts above.
(b) | Pepco's, DPL's and ACE's stock-based compensation expense for the years ended December 31, 2018 and 2017 was not material.
(c) | These amounts primarily represent amounts billed to PHI’s subsidiaries through PHISCO intercompany allocations.
Stock Based Compensation Tax Benefit | The following tables present information regarding Exelon’s tax benefits for the years ended December 31, 2018, 2017 and 2016.
Exelon | Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Realized tax benefit when exercised/distributed: |  |  |  |  |
Restricted stock units | 28 |  |  | 35 |  |  | 27 |
Performance share awards | 16 |  |  | 29 |  |  | 18 |
Schedule of Share-based Compensation, Stock Options, Activity | The following table presents information with respect to stock option activity for the year ended December 31, 2018:
| Shares |  | Weighted Average Exercise Price (per share) |  | Weighted Average Remaining Contractual Life (years) |  | Aggregate Intrinsic Value
Balance of shares outstanding at December 31, 2017 | 6,723,611 |  |  | $ | 47.69 |  |  | 2.65 |  | $ | 7 |
Options exercised | (1,522,952 | ) |  | 36.54 |  |  |  |  |
Options forfeited | — |  |  | — |  |  |  |  |
Options expired | (1,173,007 | ) |  | 74.99 |  |  |  |  |
Balance of shares outstanding at December 31, 2018 | 4,027,652 |  |  | $ | 43.95 |  |  | 2.90 |  | $ | 14 |
Exercisable at December 31, 2018 (a) | 4,027,652 |  |  | $ | 43.95 |  |  | 2.90 |  | $ | 14 |
__________
(a) | Includes stock options issued to retirement eligible employees.
Stock Options Exercised | The following table summarizes additional information regarding stock options exercised for the years ended December 31, 2018, 2017 and 2016:
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Intrinsic value(a) | $ | 12 |  |  | $ | 15 |  |  | $ | 11 |
Cash received for exercise price | 56 |  |  | 107 |  |  | 19 |
__________
(a) | The difference between the market value on the date of exercise and the option exercise price.
Schedule of Nonvested Restricted Stock Units Activity | The following table summarizes Exelon’s nonvested restricted stock unit activity for the year ended December 31, 2018: Exelon
| Shares |  | Weighted Average Grant Date Fair Value (per share)
Nonvested at December 31, 2017(a) | 3,389,503 |  |  | $ | 32.24 |
Granted | 1,321,988 |  |  | 38.60 |
Vested | (1,845,300 | ) |  | 32.03 |
Forfeited | (65,046 | ) |  | 32.96 |
Undistributed vested awards (b) | (507,804 | ) |  | 36.76 |
Nonvested at December 31, 2018(a) | 2,293,341 |  |  | $ | 35.06 |
__________
(a) | Excludes 1,131,487 and 1,488,383 of restricted stock units issued to retirement-eligible employees as of December 31, 2018 and 2017, respectively, as they are fully vested.
(b) | Represents restricted stock units that vested but were not distributed to retirement-eligible employees during 2018.
Schedule of Nonvested Performance-based Units Activity | The following table summarizes Exelon’s nonvested performance share awards activity for the year ended December 31, 2018: Exelon
| Shares |  | Weighted Average Grant Date Fair Value (per share)
Nonvested at December 31, 2017(a) | 2,956,966 |  |  | $ | 32.65 |
Granted | 1,637,542 |  |  | 38.15 |
Change in performance | 1,348,029 |  |  | 30.66 |
Vested | (848,574 | ) |  | 36.26 |
Forfeited | (50,467 | ) |  | 36.24 |
Undistributed vested awards (b) | (1,640,268 | ) |  | 33.38 |
Nonvested at December 31, 2018(a) | 3,403,228 |  |  | $ | 33.13 |
__________
(a) | Excludes 3,586,259 and 2,723,440 of performance share awards issued to retirement-eligible employees as of December 31, 2018 and 2017, respectively, as they are fully vested.
(b) | Represents performance share awards that vested but were not distributed to retirement-eligible employees during 2018.
The following table summarizes the weighted average grant date fair value and the fair value of performance share awards granted and settled for the years ended December 31, 2018, 2017 and 2016:
| Year Ended December 31,
| 2018(a) |  | 2017 |  | 2016
Weighted average grant date fair value (per share) | $ | 38.15 |  |  | $ | 35.00 |  |  | $ | 28.85 |
Fair value of performance shares settled | 61 |  |  | 72 |  |  | 45 |
Fair value of performance shares settled in cash | 49 |  |  | 56 |  |  | 28 |
__________
(a) | As of December 31, 2018, $33 million of total unrecognized compensation costs related to nonvested performance shares are expected to be recognized over the remaining weighted-average period of 1.7 years.
Not Settled Performance Share Awards Balance Sheet Presentation | The following table presents the balance sheet classification of obligations related to outstanding performance share awards not yet settled:
| December 31,
| 2018 |  | 2017
Current liabilities(a) | $ | 135 |  |  | $ | 57 |
Deferred credits and other liabilities(b) | 109 |  |  | 100 |
Common stock | 26 |  |  | 26 |
Total | $ | 270 |  |  | $ | 183 |
__________
(a) | Represents the current liability related to performance share awards expected to be settled in cash.
(b) | Represents the long-term liability related to performance share awards expected to be settled in cash.

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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