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Variable Interest Entities Variable Interest Entities - Carrying Amounts and Classification of Consolidated VIE Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Variable Interest Entity [Line Items] |  |  |
Current assets | [1] | $ 938 | $ 662
Noncurrent assets | [1] | 9,071 | 9,317
Total assets | [1] | 10,009 | 9,979
Current liabilities | [1] | 274 | 308
Noncurrent liabilities | [1] | 3,280 | 3,316
Total liabilities | [1] | 3,554 | 3,624
Exelon Generation Co L L C [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Current assets |  | 931 | 652
Noncurrent assets |  | 9,045 | 9,286
Total assets |  | 9,976 | 9,938
Current liabilities |  | 252 | 272
Noncurrent liabilities |  | 3,233 | 3,250
Total liabilities |  | 3,485 | 3,522
Pepco Holdings LLC [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Current assets | [1] | 7 | 10
Noncurrent assets | [1] | 26 | 31
Total assets | [1] | 33 | 41
Current liabilities | [1] | 22 | 36
Noncurrent liabilities | [1] | 47 | 66
Total liabilities | [1] | 69 | 102
Atlantic City Electric Company [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Current assets |  | 4 | 6
Noncurrent assets |  | 19 | 23
Total assets |  | 23 | 29
Current liabilities |  | 19 | 32
Noncurrent liabilities |  | 40 | 58
Total liabilities |  | $ 59 | $ 90
[1] | Includes certain purchase accounting adjustments not pushed down to the ACE standalone entity.

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- Definition Amount of consolidated variable interest entity's (VIE) assets, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5710-111685 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=6839525&loc=SL6758485-165988 + Details
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- Definition Amount of consolidated variable interest entity's (VIE) assets classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=6839525&loc=SL6758485-165988 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5710-111685 + Details
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- Definition The carrying amount of the consolidated Variable Interest Entity's liabilities included in the reporting entity's statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5710-111685 + Details
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- Definition Amount of consolidated variable interest entity's (VIE) liabilities classified as current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=6839525&loc=SL6758485-165988 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5710-111685 + Details
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