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Schedule I - Condensed Financial Information of Parent (Exelon Corporate) - Condensed Statements of Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net cash flows provided by (used in) operating activities | $ 8,644 | $ 7,480 | $ 8,461
Cash flows from investing activities |  |  |
Other investing activities | 58 | (43) | (153)
Net cash flows provided by (used in) investing activities | (7,834) | (7,971) | (15,450)
Cash flows from financing activities |  |  |
Issuance of long-term debt | 3,115 | 3,470 | 4,716
Proceeds from short-term borrowings with maturities greater than 90 days | 126 | 621 | 240
Retirement of long-term debt | (1,786) | (2,490) | (1,936)
Common stock issued from treasury stock | 0 | 1,150 | 0
Dividends paid on common stock | (1,332) | (1,236) | (1,166)
Proceeds from employee stock plans | 105 | 150 | 55
Other financing activities | (108) | (83) | (85)
Net cash flows provided by (used in) financing activities | (219) | 767 | 1,191
Increase (Decrease) in cash, cash equivalents and restricted cash | 591 | 276 | (5,798)
Cash, cash equivalents and restricted cash at beginning of period | 898 | 635 | 6,502
Cash, cash equivalents and restricted cash at end of period | 1,349 | 898 | 635
Exelon Corporate [Member] |  |  |
Net cash flows provided by (used in) operating activities | 2,581 | 1,921 | 1,029
Cash flows from investing activities |  |  |
Changes in Exelon intercompany money pool | 1 | (129) | 1,390
Investment in affiliates | (1,236) | (1,717) | (1,757)
Acquisition of business | 0 | 0 | 6,962
Other investing activities | 0 | (5) | 5
Net cash flows provided by (used in) investing activities | (1,235) | (1,851) | (7,324)
Cash flows from financing activities |  |  |
Issuance of long-term debt | 0 | 0 | 1,800
Proceeds from short-term borrowings with maturities greater than 90 days | 0 | 500 | 0
Retirement of long-term debt | 0 | (569) | (46)
Common stock issued from treasury stock | 0 | 1,150 | 0
Dividends paid on common stock | (1,332) | (1,236) | (1,166)
Proceeds from employee stock plans | 105 | 150 | 55
Other financing activities | (4) | (9) | (20)
Net cash flows provided by (used in) financing activities | (1,231) | (14) | 623
Increase (Decrease) in cash, cash equivalents and restricted cash | 115 | 56 | (5,672)
Cash, cash equivalents and restricted cash at beginning of period | 74 | 18 | 5,690
Cash, cash equivalents and restricted cash at end of period | $ 189 | $ 74 | $ 18

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 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 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906 + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3574-108585 + Details
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