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Revenue Recognition Revenue Recognition (Tables) | 12 Months Ended
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Dec. 31, 2018
Revenue from Contract with Customer (All Registrants) [Abstract] |
Contract with Customer, Asset and Liability [Table Text Block] | he following table provides a rollforward of the contract assets reflected in Exelon's and Generation's Consolidated Balance Sheets from January 1, 2018 to December 31, 2018:
Contract Assets |  | Exelon and Generation
Balance as of January 1, 2018 |  | $ | 283 |
Increases as a result of changes in the estimate of the stage of completion |  | 50 |
Amounts reclassified to receivables |  | (146 | )
Balance at December 31, 2018 |  | $ | 187 |
The Utility Registrants do not have any contract assets. The following table provides a rollforward of the contract liabilities reflected in Exelon's and Generation's Consolidated Balance Sheet from January 1, 2018 to December 31, 2018:
Contract Liabilities | Exelon |  | Generation
Balance as of January 1, 2018 | $ | 35 |  |  | $ | 35 |
Increases as a result of additional cash received or due | 179 |  |  | 465 |
Amounts recognized into revenues | (187 | ) |  | (458 | )
Balance at December 31, 2018 | $ | 27 |  |  | $ | 42 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] |
| 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 and thereafter |  | Total
Exelon | $ | 631 |  |  | $ | 329 |  |  | $ | 119 |  |  | $ | 47 |  |  | $ | 138 |  |  | $ | 1,264 |
Generation | 631 |  |  | 329 |  |  | 119 |  |  | 47 |  |  | 138 |  |  | 1,264 |

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- Definition Revenue from Contract with Customer (All Registrants) [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of expected timing for satisfying remaining performance obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84173487&loc=SL51747714-108306 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130556-203045 + Details
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