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Shareholders' Equity Shareholder Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 01, 2017 | Sep. 19, 2016 | Sep. 18, 2016 | Jul. 03, 2016 | Jul. 03, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2017 | Jul. 30, 2015 | Jun. 30, 2014
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock Repurchased During Period, Shares |  |  |  |  |  |  | 33,000,000 | 0 |  |  |
Temporary Equity, Share Subscriptions |  |  |  |  |  |  |  |  |  | 57,500,000 | 57,500,000
Sale of Stock, Price Per Share |  |  |  |  |  |  |  |  |  | $ 32.48 |
Treasury Stock, Number of Shares Held |  |  |  |  |  | 2,000,000 | 2,000,000 |  |  |  |
Treasury stock, at cost |  |  |  |  |  | $ 123 | $ 123 |  |  |  |
Stock Repurchased During Period, Value |  |  |  |  |  | $ 0 |  | $ 0 |  |  |
Stock Redeemed or Called During Period, Value |  |  |  |  |  |  |  | (193) |  |  |
Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized |  |  |  |  |  | 100,000,000 | 100,000,000 |  |  |  |
Preferred Stock, Shares Outstanding |  |  |  |  |  | 0 | 0 |  |  |  |
Equity units issued [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Treasury Stock Reissued | 33,000,000 |  |  |  |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Cash, at Fair Value |  |  |  |  |  |  |  |  |  | $ 1,870 |
Commonwealth Edison Co [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding |  |  |  |  |  | 60,285 | 60,584 |  |  |  |
Commonwealth Edison Co [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common Stock Shares Reserved For Warrant Conversion |  |  |  |  |  | 20,095 | 20,195 |  |  |  |
Commonwealth Edison Co [Member] | Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized |  |  |  |  |  | 850,000 | 850,000 |  |  |  |
Preferred Stock, Shares Outstanding |  |  |  |  |  | 0 | 0 |  |  |  |
Commonwealth Edison Co [Member] | Cumulative Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized |  |  |  |  |  | 6,810,451 | 6,810,451 |  |  |  |
Preferred Stock, Shares Outstanding |  |  |  |  |  | 0 | 0 |  |  |  |
Baltimore Gas and Electric Company [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Value, Outstanding |  |  |  |  |  |  |  | $ 190 |  |  |
Preferred Stock, Redemption Price Per Share |  |  |  |  |  |  |  | $ 100 |  |  |
Stock Redeemed or Called During Period, Shares |  | 400,000 | 500,000 | 400,000 | 600,000 |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 6.70% | 6.97% | 7.125% | 6.99% |  |  |  |  |  |
Stock Redeemed or Called During Period, Value |  |  | $ 90 | $ 100 |  |  |  | $ (190) |  |  |
Junior Subordinated Debt [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share |  |  |  |  |  |  |  |  | $ 35 |  |
Junior Subordinated Notes |  |  |  |  |  |  | $ 1,150 |  |  |  | $ 1,150
Equity units issued |  |  |  |  |  |  |  |  |  |  | 23,000,000
Stock Issued During Period, Shares, Treasury Stock Reissued |  |  |  |  |  |  | 33,000,000 |  |  |  |

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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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