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Schedule I - Condensed Financial Information of Parent (Exelon Corporate) - Condensed Balance Sheet (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Feb. 17, 2012
--- | --- | --- | --- | --- | ---
Current assets |  |  |  |  |  |
Cash and cash equivalents |  | $ 1,349 | $ 898 | $ 635 | $ 6,502 |
Accounts receivable, net |  |  |  |  |  |
Other accounts receivable |  | 1,256 | 1,132 |  |  |
Regulatory assets, current |  | 1,222 | 1,267 |  |  |
Other |  | 1,238 | 1,260 |  |  |
Total current assets |  | 13,360 | 11,896 |  |  |
Property, plant and equipment, net |  | 76,707 | 74,202 |  |  |
Deferred debits and other assets |  |  |  |  |  |
Regulatory assets, noncurrent |  | 8,237 | 8,021 |  |  |
Other |  | 1,575 | 1,330 |  |  |
Total assets | [1] | 119,666 | 116,770 |  |  |
Current liabilities |  |  |  |  |  |
Short-term borrowings |  | 714 | 929 |  |  |
Long-term debt due within one year |  | 1,349 | 2,088 |  |  |
Accounts payable |  | 3,800 | 3,532 |  |  |
Accrued expenses |  | 2,112 | 1,837 |  |  |
Payables to affiliates, current |  | 5 | 5 |  |  |
Regulatory Liability, Current |  | 644 | 523 |  |  |
Other |  | 1,035 | 1,069 |  |  |
Total current liabilities |  | 11,404 | 10,798 |  |  |
Long-term debt |  | 34,075 | 32,176 |  |  |
Deferred credits and other liabilities |  |  |  |  |  |
Regulatory liabilities, noncurrent |  | 9,559 | 9,865 |  |  |
Pension obligations |  | 3,988 | 3,736 |  |  |
Non-pension postretirement benefit obligations |  | 1,928 | 2,093 |  |  |
Other |  | 2,130 | 2,097 |  |  |
Total deferred credits and other liabilities |  | 40,727 | 41,220 |  |  |
Total liabilities | [1] | 86,596 | 84,583 |  |  |
Commitments and Contingencies |  |  |  |  |  | $ 1,000
Shareholders’ equity |  |  |  |  |  |
Common stock |  | 19,116 | 18,964 |  |  |
Treasury stock, at cost |  | (123) | (123) |  |  |
Retained earnings |  | 14,766 | 14,081 |  |  |
Accumulated other comprehensive income (loss), net |  | (2,995) | (3,026) |  |  |
Total shareholders’ equity |  | 30,764 | 29,896 |  |  |
Total liabilities and equity |  | 119,666 | 116,770 |  |  |
Exelon Corporate [Member] |  |  |  |  |  |
Current assets |  |  |  |  |  |
Cash and cash equivalents |  | 189 | 74 | $ 18 | $ 5,690 |
Accounts receivable, net |  |  |  |  |  |
Other accounts receivable |  | 48 | 431 |  |  |
Accounts receivable from affiliates, current |  | 44 | 33 |  |  |
Note receivable from affiliates, current |  | 216 | 217 |  |  |
Regulatory assets, current |  | 182 | 284 |  |  |
Other |  | 4 | 4 |  |  |
Total current assets |  | 683 | 1,043 |  |  |
Property, plant and equipment, net |  | 48 | 50 |  |  |
Deferred debits and other assets |  |  |  |  |  |
Regulatory assets, noncurrent |  | 3,742 | 3,697 |  |  |
Investments in affiliates |  | 40,448 | 39,311 |  |  |
Deferred income taxes |  | 1,455 | 1,431 |  |  |
Notes receivable from affiliates, noncurrent |  | 898 | 910 |  |  |
Other |  | 235 | 234 |  |  |
Total deferred debits and other assets |  | 46,778 | 45,583 |  |  |
Total assets |  | 47,509 | 46,676 |  |  |
Current liabilities |  |  |  |  |  |
Short-term borrowings |  | 500 | 500 |  |  |
Accounts payable |  | 1 | 2 |  |  |
Accrued expenses |  | 184 | 99 |  |  |
Payables to affiliates, current |  | 360 | 360 |  |  |
Regulatory Liability, Current |  | 15 | 16 |  |  |
Pension obligations |  | 63 | 65 |  |  |
Other |  | 14 | 46 |  |  |
Total current liabilities |  | 1,137 | 1,088 |  |  |
Long-term debt |  | 7,147 | 7,161 |  |  |
Deferred credits and other liabilities |  |  |  |  |  |
Regulatory liabilities, noncurrent |  | 32 | 15 |  |  |
Pension obligations |  | 7,795 | 7,792 |  |  |
Non-pension postretirement benefit obligations |  | 199 | 322 |  |  |
Deferred income taxes |  | 233 | 220 |  |  |
Other |  | 202 | 180 |  |  |
Total deferred credits and other liabilities |  | 8,461 | 8,529 |  |  |
Total liabilities |  | 16,745 | 16,778 |  |  |
Commitments and Contingencies |  |  |  |  |  |
Shareholders’ equity |  |  |  |  |  |
Common stock |  | 19,116 | 18,966 |  |  |
Treasury stock, at cost |  | (123) | (123) |  |  |
Retained earnings |  | 14,766 | 14,081 |  |  |
Accumulated other comprehensive income (loss), net |  | (2,995) | (3,026) |  |  |
Total shareholders’ equity |  | 30,764 | 29,898 |  |  |
Total liabilities and equity |  | $ 47,509 | $ 46,676 |  |  |
[1] | Exelon’s consolidated assets include $9,667 million and $9,597 million at December 31, 2018 and 2017, respectively, of certain VIEs that can only be used to settle the liabilities of the VIE. Exelon’s consolidated liabilities include $3,548 million and $3,618 million at December 31, 2018 and 2017, respectively, of certain VIEs for which the VIE creditors do not have recourse to Exelon. See Note 2–Variable Interest Entities for additional information.

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- Definition The aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due within one year (or one business cycle). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: 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(3)(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: 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(11)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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